Composite-Spectrum and Related Stars That Are Candidate Detached Post-Common-Envelope Binaries, v. 2.3 (1998 March 29) F. A. Ringwald Dept. of Astronomy & Astrophysics The Pennsylvania State University 525 Davey Laboratory University Park, PA 16802-6305 U.S.A. This compilation from the literature lists composite-spectrum stars, known or suspected to have hot subdwarfs, white dwarfs, or otherwise evolved components, with cooler companions. Included are probably similar systems in which the companions have been detected only indirectly, e.g., in close binary planetary nebula nuclei with strong irradiation variations. Most of the systems are poorly known. Orbital periods, P(orb), have been measured for only 54 of the 342 binaries, including 7 of 22 unresolved double degenerates. There are also 3 known or suspected triples. This compilation may therefore be useful for finding close binaries that have passed through a phase of common envelope evolution. These are sometimes called precataclysmic binaries, although many will not become cataclysmic variables within a Hubble time (Ritter 1986). Spectral types were taken from many sources, but in general follow the classification scheme of Green, Schmidt, & Liebert (1986). All coordinates are for 1950.0. This list is probably *not* comprehensive, so use care with statistics. There are also many duplications between source lists. To save space, entries already appearing on previous lists were removed on subsequent ones; the duplicate entries that were retained have in subsequent lists been encased in brackets ([]). A colon after an entry denotes uncertainty; a 'B' after an entry in the V column indicates a B magnitude. 1) Systems with known P(orb), most listed by Ritter (1990) or Warner (1995): RA(1950) DEC(1950) V Sp.type P(orb)(d) IK Peg 21 24 07.19 +19 09 28.9 6.07 A8m 21.724 HD 185510 19 36 58.42 -06 10 44.8 8.0 sdB+K0III-IV 20.66,e=0.1 V651 Mon 07 06 49.7 -00 43 30 11.3-15.3 PN A5V 15.991 Feige 24 02 32 31.2 +03 30 52 12.4 DA1wk+M3.5V 4.2319 BE UMa 11 55 09.8 +49 13 01 14.1-15.6 PN DO+M1-5V 2.291179 EUVE J0720-31.7 07 18 52.3 -31 41 16 16.1 DAO+dM0-2 1.26245 EG UMa 12 13 16.2 +52 47 48 13.3-13.8B DA+M4V 0.66765 V664 Cas 02 59 34.2 +64 41 45 14.-15. PN 0.5817 HZ 22 12 12 17.6 +36 55 30 13.1 B2 0.573703 HZ 9 04 29 29.7 +17 38 45 14.0 DA2+M5EV 0.56433 V471 Tau 03 47 33.4 +17 05 46 9.2-9.8 K2V+DA2 0.521183 UU Sge 19 39 55.2 +16 58 00 14.2-15.6 PN sdO+dK 0.465069 KV Vel 10 52 28.97 -48 30 54 12.3 PN 0.357113 GK Vir 14 13 03.6 +01 31 13 17.0-22 DAwk+M0-6/5 0.344331 EC 11575-1845 11 57 32.0 -18 45 23 13 sdO+dM 0.32762 AA Dor 05 32 08.1 -69 55 10 11.2-11.6 sdO 0.261540 GD 245 22 56 22 +24 59.7 13.68 DA2+M3-5 0.173661 NN Ser 15 50 35.7 +13 03 35 16.6-22.: DA+dM 0.1301 HW Vir 12 41 44.6 -08 23 50 10.5-11.5 sdB 0.1167 IK Peg: Wonnacott, Kellett, & Stickland 1993; Barstow et al. 1994; Smalley et al. 1996; HD 185510: Boffin, Cerf, & Paulus 1993; Jeffrey & Simon 1997; V651 Mon: Costero et al. 1986; Feige 24: Vennes & Thorstensen 1994a; BE UMa: Ferguson et al. 1987; Ferguson & James 1994; Wood, Robinson, & Zhang 1995; Liebert, Tweedy, Napiwotzki, & Fulbright 1995; EUVE J0720-31.7: Vennes & Thorstensen 1994b, 1996; EG UMa: Stauffer 1987; V664 Cas: Acker & Stenholm 1990; HZ 22: Schoenberner 1978; HZ 9: Stauffer 1987; V471 Tau: Bois, Lanning, & Mochnacki 1988; Skillman & Patterson 1988; UU Sge: Bell, Pollacco, & Hilditch 1994; Pollacco & Bell 1997; KV Vel: Drilling 1985; Landolt & Drilling 1986; GK Vir: Fulbright, Liebert, Bergeron, & Green 1993; EC 11575-1845: Chen et al. 1995; AA Dor: Kudritzki et al. 1982; Kilkenny 1986; GD 245: Schmidt, Smith, & Harvey 1995; NN Ser: Catalan et al. 1994; HW Vir: Wood, Zhang, & Robinson 1993; Kilkenny, Marang, & Menzies 1994 2) Systems with P(orb) known or estimated, needing improved spectroscopic studies and mass determinations. What needs to be done varies from case to case (see Ritter 1990, Boffin, Cerf, & Paulus 1993, and Warner 1995): RA(1950) DEC(1950) V Sp.type P(orb)(d) AY Cet 01 14 02.51 -02 45 28.4 5.5 G5IIIe+DA 56.8147,e=0.04 FF Aqr 21 58 00.8 -02 58 53 9.3 sdOB/G8III 9.207755 IN Com 12 53 07.7 +26 09 44 8.8 PN sdO/G5III 5.9: HD 27483 04 18 03.77 +13 44 47.0 6.20 F6V+DA 3.0591 14 Aur C 05 12 07.9 +32 37 45 8.0 F4V+DA 2.99 PG 1538+269 15 38 17.8 +26 58 12 13.83 sdB 2.5: HD 49798 06 46 34.9 -44 15 34 8.3 sdO+F4-K0 1.547671 RE 1016-053 10 13 56.7 -05 05 48 14.3 DAO+dM1-3 0.78929 LW Hya 12 50 52.9 -22 36 05 9.6 PN sd+G8III 0.766: A35 EUVE J2013+40.0 20 11 23.4 +39 53 37 14.6 DAO+dM1-4 0.7059 PG 1026+002 10 26 00.8 +00 14 54 13.8 DA+M2-3V 0.597298 V477 Lyr 18 29 18.4 +26 53 59 14.6-15.9B PN 0.471729 RR Cae 04 19 36.3 -48 46 06 14.4-18.2B DAwk+dMe 0.30371 PG 0308+096 03 08 12.8 +09 38 09 15.3 DA4+M2-3V 0.289114 U Leo 10 21 22.7 +14 15 24 17.4 G? 0.27: Feige 36 11 01 50.4 +24 55 56 12.78 sdB 0.206 BPM 71214 03 31 23.7 -09 01 01 14.2 0.1806 GD 1401 01 45 48.7 -25 47 38 14.3B DA(3)+dM 0.17: GD 448 07 10 53 +74 06.0 14.97 DA+dM 0.103: AY Cet: Simon, Fekel, & Gibson 1985; FF Aqr: Dworetsky et al. 1977; IN Com: Barstow et al. 1994; Jasniewicz et al. 1996; HD 27483: Barstow et al. 1994; 14 Aur C: Hodgkin et al. 1993; Barstow et al. 1994; PG 1538+269: Saffer et al. 1994; HD 49798: Kudritzki & Simon 1978; EUVE J1016-053: Tweedy et al. 1993; Thorstensen, Vennes, & Bowyer 1996; LW Hya: Acker & Jasniewicz 1990; Jasniewicz et al. 1992; Jasniewicz, Lapierre, & Monier 1994; Hollis et al. 1996; EUVE J2013+40.0: Thorstensen, Vennes, & Shambrook 1994; Barstow et al. 1995; PG 1026+002: Saffer et al. 1993; V477 Lyr: Pollacco & Bell 1994, 1997; RR Cae: Bragaglia et al. 1990; PG 0308+096: Saffer et al. 1993; U Leo: Downes & Szkody 1989; Feige 36: Reid, Saffer, & Liebert 1993; BPM 71214: Livio & Shara 1987; GD 1401: Bues 1987; GD 448: Marsh & Duck 1996 3) Systems with known P(orb) that are not strictly spectroscopic composites, since the cool companions have not been directly detected. They probably do have them, though; they certainly have evolved hot components: RA(1950) DEC(1950) V Sp.type P(orb)(d) SP 1 15 47 56.7 -51 22 24 13.9 PN 2.91 QR Sge 19 09 16.3 +16 46 35 11.8 PN: WN8 2.3583: HaTr 4 16 41 08.0 -51 06 48 17.1 PN 1.71 Abell 65 19 43 33.2 -23 15 19 15.9 PN 1.000 VW Pyx 08 55 38.5 -28 45 58 16.5->17.5 PN 0.6707 MT Ser 17 26 10.2 -15 10 39 15.4-16.0 PN sdO 0.1132 SP 1: Acker 1982; Bond & Livio 1990; QR Sge: Acker 1982; Moffat, Lamontagne, Seggewiss 1982; Van der Hucht 1985; Acker 1992; De Kool & Ritter 1993; HaTr 4: Hartl & Tritton 1985; Bond & Livio 1990; Abell 65: Bond & Livio 1995; VW Pyx: Bond & Grauer 1987; Bond & Livio 1990; MT Ser: Grauer & Bond 1983; Green, Liebert, & Wesemael 1984; Pollacco & Bell 1997 4) P(orb) probably short (< few days), requiring time-resolved spectroscopic studies (with conventional, block-scheduled telescopes): RA(1950) DEC(1950) V Sp.type P(orb)(d) PG 0322+078 03 22 53 +07 49 20 16.01B CV? sd e short? RX J0458.9-6628 04 58 48.6 -66 32 38 16.6 DA+dM2 0.7: LTT 2980 07 52.8 -14 38 13.5 DA SZB96 close? bet Crt 11 09 11.73 -22 33 09.0 4.48 A1V <20.1 PG 1114+187 11 14 25.6 +18 42 21 15.22B sdBpe short? PG 1119+147 11 19 36.5 +14 42 48 15.91 Bin: SA79-B1 PG 1316+678 13 16 11.8 +67 47 45 16.02 Bin: PG 1524+439 15 24 09.7 +43 51 53 15.57 sdB+K FGL84 short? PG 1632+088 16 32 22 +08 46 05 13.37B sdBpe short? PG 1656+213 16 56 12.4 +21 15 05 15.05B sdB+K FGL84 short? PG 1701+359 17 01 35.0 +35 52 56 13.41B sdB var? HD 192273 20 14 04.4 -69 35 28 8.8 B2, like HZ 22? short? RE J2024+200 20 22 00.44 +19 51 16.1 15.6 DA+dM var? PG 2059+013 20 59 46.6 +01 20 22 13.95B sdB eclipsing? G 93-53 21 51 32 -01 31.3 14.41 DAs SZB96 close KPD 2154+4048 21 54 13 +40 48.5 15.22 DA SZB96 close PB 7032 21 55.5 -04 55 13.22 sdBpe short? PG 0322+078: Kilkenny, Heber, & Drilling 1988; RX J0458.9-6628: Hutchings et al. 1995; bet Crt: Fleming et al. 1991; Barstow et al. 1994; Smalley et al. 1997; PG 1114+187: Ringwald 1994; Misselt & Shafter 1995; PG 1119+147: Ringwald 1994; Misselt & Shafter 1995; PG 1316+678: Ringwald 1994; Misselt & Shafter 1995; PG 1524+439: Ferguson, Green, & Liebert 1984; PG 1632+088: Wesemael et al. 1992; PG 1656+213: Ferguson, Green, & Liebert 1984; PG 1701+359: Allard et al. 1994; HD 192273: Shipman & Wegner 1979; RE J2024+200: Marsh et al. 1995; PG 2059+013: Theissen et al. 1993; Saffer et al. 1994 PB 7032: Berger & Fringant 1984 5) P(orb) probably long (>> few days), requiring queue-scheduled spectroscopy: RA(1950) DEC(1950) V Sp.type P(orb)(d) 56 Per 04 21 22.59 +33 50 47.3 5.74 F4V long? PG 0900+400 09 00 06.5 +40 02 54 12.84B sdB+K FGL84 long? Feige 34 10 36 41.2 +43 21 50 11.24 sdO+IR excess long? RE J1629+780 16 31 31.3 +78 11 03 13.0B DA2+dM4-5 long? BD-7 5977 23 15 11.6 -06 44 56 9.4 K0III-IV+sdO long? 56 Per: Landsman, Simon, & Bergeron 1996; PG 0900+400: Ferguson, Green, & Liebert 1984; Wade & Potter 1995; Feige 34: Thejll, MacDonald, & Saffer 1991; Thejll, Ulla, & MacDonald 1995; Wesemael, Green, & Liebert 1985; RE J1629+780: Catalan et al. 1995; BD-7 5977: Viton et al. 1991; Tobin, Viton, & Sivan 1994 6) Complete or otherwise statistically interesting samples of objects, potentially useful for population studies. For objects selected from the Palomar-Green survey (Green, Schmidt, & Liebert 1986, and denoted by PG), a '0.' between the magnitude and Sp.Type columns denotes objects not in the complete sample. 6a) Detached binaries from the Palomar-Green catalog (Green et al. 1986); FGL84 = observed by Ferguson, Green, & Liebert (1984): RA(1950) DEC(1950) V Sp.type Comments PG 0825+428 08 25 34.4 +42 50 42 15.58B Bin FGL84 PG 0848+416 08 48 01.8 +41 34 47 16.13 Bin FGL84 K345-6 PG 0859+484 08 59 10.3 +48 23 11 16.17B Bin WD+M PG 0922+259 09 22 57.3 +25 51 58 16.41 Bin FGL84 var? TON 15 PG 1104+243 11 04 45.4 +24 19 27 11.82 Bin FGL84 var? PG 1109-070 11 09 04.4 -07 02 13 14.16: Bin FGL84 PG 1111+204 11 11 01.9 +20 26 57 13.86B Bin TON1360 PG 1210+429 12 10 07.9 +42 56 42 15.02 Bin FGL84 HZ 20 PG 1248+375 12 48 38.8 +37 27 10 15.88B Bin FGL84 HZ 32 PG 1309-078 13 09 08.5 -07 49 18 14.34B Bin FGL84 L905-20 PG 1315+645 13 15 10.0 +64 31 10 15.05 Bin FGL84 PG 1421+345 14 21 29.0 +34 27 53 14.78 Bin FGL84 K PG 1502-103 15 02 40.3 -10 19 49 15.51 Bin FGL84 PG 1508+177 15 08 49.1 +17 43 28 16.28 Bin FGL84 var? PG 1514+034 15 14 43.3 +03 21 24 14.6B sdB+K Bin FGL84 var? GR 440 PG 1515+044 15 15 38.3 +04 21 36 15.46 Bin FGL84 PG 1517+265 15 17 05.1 +26 28 10 15.80 Bin FGL84 Ton 228 PG 1517-077 15 17 57.8 -07 45 35 14.14 Bin var? PG 1539+292 15 39 21.7 +29 11 03 14.64 Bin FGL84 PG 1601+145 16 01 47.0 +14 32 58 14.50 Bin FGL84 PG 1612+736 16 12 54.0 +73 35 30 14.55B Bin FGL84 PG 1636+104 16 36 39.9 +10 24 54 13.81B Bin FGL84 PG 1709+138 17 09 18.0 +13 47 31 16.15B Bin FGL84 6b.a) Composite-spectrum objects from the Palomar-Green catalog (Green et al. 1986): RA(1950) DEC(1950) V Sp.type Comments PG 0237+116 02 37 24.0 +11 35 37 15.12B COMP DO c PG 1025+258 10 25 58.2 +25 45 39 15.95B T518,COM DA PG 1049+103 10 49 50.6 +10 19 37 15.83B COMP DA 4 PG 1101+384 11 01 36.4 +38 28 27 13.34B COMP DC PG 1110+045 11 10 42.7 +04 29 28 15.12B COMP ? sdOA PG 1126+185 11 26 42.1 +18 33 12 13.37B COMP DC PG 1133+489 11 33 27.4 +48 59 55 16.20B COMP: DO c PG 1420+518 14 20 57.3 +51 49 17 15.75B COMP sdB PG 1426+047 14 26 03.8 +04 40 52 16.18B COMP: sdB PG 1443+337 14 43 55.9 +33 41 28 16.01 COMP DA2 PG 1622+324 16 22 53.5 +32 23 42 16.04B COMP DA w PG 1646+062 16 46 40.5 +06 14 05 15.84B COMP DA s PG 2102+037 21 02 36.3 +03 42 43 15.67 COMP sdO PG 2200+085 22 00 51.9 +08 31 06 13.84 COMP K var? PG 2244+031 22 44 24.7 +03 08 52 16.02B COMP DA 1 6b.b) The following were classified as composite-sepctrum objects by Green et al. (1986), but were found to be visual doubles by Zuckerman & Becklin (1992) or by Ringwald & Abbott (1997): RA(1950) DEC(1950) V Separation(") Sp.type PG 0205+134 02 05 21.3 +13 22 18 13.78B 0.8s COMP sdOB PG 0933+025 09 33 05.5 +02 35 33 16.01B 1.0se COMP DA 5 PG 0950+186 09 50 00.9 +18 34 25 15.74B 1.1e COMP DA 4 PG 0956+046 09 56 01.0 +04 35 58 15.95 2.2se COMP DA 5 PG 1411+218 14 11 08.5 +21 51 50 13.59B 11s COMP DB 4 (PG 0933+025, although a visual double, has an emission core: might it be triple? Or quadruple, since there is another star about 15" away?) 6b.c) The following are visual doubles, found by Green et al. (1986), so they probably have wider separations (>2"). Nevertheless, both components of should be checked with single spectra: either component may be a composite-spectrum close binary, and the other component may be a companion in a triple system: RA(1950) DEC(1950) V Sp.type Comments PG 0111+177 01 11 04.7 +17 42 55 15.85B VIS.DBL DA 3 PG 0845+129 08 45 59.5 +12 53 00 16.48B V DBL M sdOB PG 1001+204 10 01 18.7 +20 23 43 16.07B T1150,+K DA SZB96 PG 1033+464 10 33 25.08 +46 23 45.4 14.86B GD123,+K DA 4 PG 1129-081 11 29 50.9 -08 05 16 16.06B V DBL G sdB-O PG 1141+505 11 41 09.5 +50 27 04 16.14B LB2094+K DA PG 1433+538 14 33 06.1 +53 48 22 15.92B GR363,+K DA 3 PG 1459+306 14 59 50.8 +30 34 41 14.26B VIS DBL DA 3 PG 1539+530 15 39 33.3 +53 02 17 15.93B DBL DA 2 6b.d) Composites from the PG survey (Green et al. 1986) that are not visually resolved, but also not in the statistically complete sample: RA(1950) DEC(1950) V Sp.type Comments [PG 0859+484] 08 59 10.3 +48 23 11 16.17B 0. WD+M Bin PG 1123+189 11 23 46.6 +18 55 18 13.11B 0. COMP DA w PG 1403-110 14 03 15.1 -11 03 22 15.92 0. COMP CV? PG 2357+125 23 57 25.4 +12 28 06 16.44B 0. COMP CV? 6b.e) Composites from the PG survey (Green et al. 1986) observed well enough to tell that either they are close binaries, or definitely are not: RA(1950) DEC(1950) V Sp.type Comments [PG 0232+035] 02 32 31.2 +03 30 52 11.91B 0. DA 1 EG20, Feige 24 [PG 0308+096] 03 08 12.9 +09 38 09 15.15B 0. COMP DA PG 0824+289 08 24 01.5 +28 53 53 14.73B COMP dC+DA [PG 1026+002] 10 26 00.9 +00 14 54 13.89 COMP DA SZB96 PG 1201+437 12 01 51.7 +43 47 38 16.50 COMP QSO PG 1210+464 12 10 28.8 +46 26 29 15.61B COMP DA SZB96 PG 1224+309 12 24 01.6 +30 55 29 15.88 COMP DA T617 FGL84 [PG 1413+015] 14 13 03.6 +01 31 13 16.73B 0. COMP DA w GK Vir PG 1633+115 16 33 24.6 +11 30 59 14.92 COMP: CV PG 2131+066 21 31 39.2 +06 37 35 16.24 COMP 1159 IR Peg PG 0824+289: Heber et al. 1993; PG 1201+437: Fleming et al. 1993; Ringwald 1997; PG 1210+464: Schultz, Zuckerman, & Becklin 1996; PG 1224+309: Ferguson, Green, & Liebert 1984; Orosz & Wade 1997; PG 1633+115: Ringwald 1994; Misselt & Shafter 1995; PG 2131+066: Kawaler et al. 1995 6c) Stars misclassified as CVs by the PG survey (Green et al. 1986) (the "Non-CVs" of Ringwald 1993, 1994): RA(1950) DEC(1950) V Sp.type Comments PG 0023+298 00 23 15.5 +29 48 36 15.44 sdOA PG 0048+091 00 48 50.5 +09 05 16 14.95 sdB PG 0051+169 00 51 01.8 +16 53 27 15.64 sdB PG 0914+120 09 14 55.3 +12 02 33 16.19 sdB No H alpha PG 0935+087 09 35 40.9 +08 45 15 16.27 DO PG 1038+270 10 38 11.7 +27 00 40 16.01 HBB PG 1104+022 11 04 06.0 +02 11 04 14.07 sdB PG 1128+098 11 28 39.2 +09 48 52 14.60 sdOA PG 1146+228 11 46 25.4 +22 47 44 15.01 sdB-O PG 1156-037 11 56 48.3 -03 44 40 13.79 sdB PG 1157+004 11 57 18.3 +00 24 34 15.88 DA PG 1217-067 12 17 23.0 -06 43 04 14.85 sdB PG 1257+010 12 57 52.0 +01 01 39 15.80 sdB-O PG 1314+041 13 14 06.3 +04 04 06 15.37 sdB PG 1315-123 13 15 01.0 -12 17 05 15.25 sdB [PG 1443+337] 14 43 55.9 +33 41 28 16.01 DA2 COMP CBS 200 PG 1445+584 14 45 35.1 +58 21 49 15.84 sdB PG 1459-026 14 59 36.3 -02 34 13 14.92 sdB PG 1520-050 15 20 40.4 -05 01 07 15.29 sdB PG 1522+122 15 22 04.7 +12 12 40 15.78 sdB PG 1617+150 16 17 33.4 +14 59 50 15.41 sdB PEC PG 1639+338 16 39 30.8 +33 50 33 15.34 sdB K433-6 PG 1657+656 16 57 14.4 +65 36 15 15.95 sdB-O PG 1710+567 17 10 26.7 +56 39 01 15.99 sdB KQ Peg 22 40 01.1 +19 16 36 15.71 sdB-O PG 2240+193 PG 2300+166 23 00 52.0 +16 33 28 15.29 sdOA PG 2315+071 23 15 16.1 +07 06 21 14.67 Bin PB 5322 6d) Thejll, Ulla, & MacDonald (1995): RA(1950) DEC(1950) V Sp.type Comments GD 274 01 04 14 +50 54.4 12.15 sdO+ PG 0110+262 01 10 31.1 +26 11 37 11.57 sdB-O+ PG 0232+095 02 32 31.0 +09 32 35 12.47 sd+ GD 299 09 34 50.0 +55 19 18 12.15 sdO+ PG 1247+55 12 47 51.2 +55 22 21 11.36 DA 3+dK GD 319 Feige 93 14 15 15.1 +13 15 39 15.29 DA PG 1415+132 6e) Theissen et al. (1995) (duplications with FGL84, PG comps removed): RA(1950) DEC(1950) V Sp.type Comments PHL 1079 01 35.8 +03 23 12.6 sdB PG 0342+026 03 42 58.0 +02 38 38 11.07B sdB PG 1432+004 14 32 46.3 +00 26 52 11.96B sdB PG 1647+253 16 47 05.4 +25 15 13 13.81B sdB-O TON 264 PG 1656+318 16 56 24.3 +31 46 09 13.88B sdB-O PG 1718+519 17 18 35.5 +51 55 05 13.46B sdB-O PG 1722+286 17 22 14.3 +28 37 59 12.91B sdB PG 1739+489 17 39 05.4 +48 55 23 12.96B HBB PG 2110+127 21 10 56.4 +12 44 44 13.56B sdB PG 2259+134 22 59 15.7 +13 22 31 13.77B sdB-O KUV 740-10 PG 2331+038 23 31 24.7 +03 47 18 13.96B sdB PB 5446 PG 2337+070 23 37 30.3 +07 00 25 15.92B sdB PB 5495 6f) Allard et al. (1994) (duplications with FGL84, PG comps, Theissen et al. 1995 removed): RA(1950) DEC(1950) V Sp.type Comments PG 0039+049 00 39 30.5 +04 53 17 12.77B sdB PB 6107 PG 0105+276 01 05 32.2 +27 36 53 14.08B sdOB PG 0749+658 07 49 39.1 +65 50 13 10.75B sdB-O PG 1040+234 10 40 56.7 +23 24 55 13.05B sdB TON1281 Feige 87 13 38 31.0 +61 07 57 11.71 sdB PG 1338+611 PG 1449+653 14 49 41.8 +65 17 58 14.19 sdB PG 1511+624 15 11 24.8 +62 21 00 14.29B sdB PG 1526+132 15 26 07.1 +01 23 23 16.20B DA 2 PG 1558-007 15 58 39.3 -00 43 26 13.75 sdB PG 1610+519 16 10 43.8 +51 57 14 13.81 sdB PG 1629+081 16 29 36.1 +08 05 58 11.83 sdB-O PG 1647+056 16 47 50.7 +05 37 58 14.47 sdB KPD 2024+5303 20 24 13 +53 03.2 14.57 sdB PG 2118+126 21 18 37.9 +12 38 03 13.64 sdB PG 2135+045 21 35 30.3 +04 28 39 13.97 sdB PG 2148+095 21 48 49.3 +09 32 55 13.27 sdB KPD 2215+5037 22 15 25 +50 37.8 13.71 sdB PG 2226+094 22 26 29.1 +09 21 59 13.64B sdB KPD 2254+5444 22 54 55 +54 44.4 14.39 sdB 6g) Likely binaries from the UV (2000 Angstrom)-excess survey of Bixler, Bowyer, & Laget (1991): RA(1950) DEC(1950) V Comments [113435001] 12 10.1 +42 56 15.0y PG 1210+429 HZ 20 Balloon110607002 12 21.2 +01 35 12.8y Balloon114041002 12 32.5 +50 03 14.0y PG 1232+501 LB 2392 Balloon081300002 13 10.6 +15 56 14.3y Balloon082700002 13 59.8 +28 40 16.4y [81400003] 15 14.7 +03 21 14.0y PG 1514+034 Balloon082800003 15 15.0 +57 04 11.4y Balloon081400004 15 20.1 +03 34 16.5y Balloon081400001 15 21 30.7 +01 44 54 17.2y sdB BPS CS 22890-0074 Balloon083500007 16 39.6 +34 54 15.5y Balloon083600004 16 48.6 +48 31 16.9y Balloon092200002 21 34 56 +13 14.9 10.43y AQ Peg Algol; eclipsing Balloon090900007 22 50.8 +21 38 13.30y Balloon083738002 23 19.3 +25 00 13.3y Balloon093100003 23 21.5 +00 23 15.7y 7) Systems from XUV/EUV surveys 7a) ``Sirius-like systems'' (Barstow et al. 1994): RA(1950) DEC(1950) V Sp.type Comments HD 14252 02 16 02.72 +28 24 46.3 5.03 A2V del Tau 04 20 02.84 +17 25 36.8 3.76 K0III omi Ori 04 49 42.06 +14 10 08.3 4.74 M3(S)+WD lam UMa 10 14 05.35 +43 09 53.5 3.40 A2IV HD 89021 56 Peg 23 04 40.34 +25 11 53.0 4.74 K0Iab+DA Ba star 7b) ROSAT WFC (Mason et al. 1995): RA(1950) DEC(1950) V Sp.type Comments BD+08 102 00 41 25.41 +09 16 35.6 10.0 G+DA RE J0044+0934 PG 1340+607 13 40 16.7 +60 44 48 12.56B sdB+dM RE J134059+602631 7c) ROSAT 2RE catalogue (Pye et al. 1995): RA(1950) DEC(1950) V Sp.type Comments HD 15638 02 26 59.24 -61 31 35.0 8.8 DA+F6V 2RE J0228-611 HD 18131 02 52 09.27 -05 31 58.7 7.2 K0 IV+DA EUVE J0254-05.3 RE J0715-702 07 15 36.35 70 19 42.6 14.4 DA+? EUVE J1027+323 10 24 23.21 +32 39 15.7 13.2 DA+G [GD 123] 10 33 25.08 +46 23 45.4 13.15 DA4+K PG 1033+464 RE J1925-566 19 21 51.28 -56 39 26.0 ? DA+G: HD 217411 22 57 59.56 -07 20 17.1 9.8 G5 RE J2300-070 HD 223816 23 50 23.7 -70 40 09 8.8 DA+F5IV 2RE J2353-702 8) Other composite-spectrum binaries 8a) Systems that may or may not be post-CE binaries, but are not unrelated. All could use improved mass determinations: RA(1950) DEC(1950) V Sp.type P(orb)(d) zet Cap 21 23 48.94 -22 37 44.3 3.74 G4Ibp+DA 2300. HD 204075 ksi01 Cet 02 10 20.75 +08 36 47.4 4.34 G8Iab 1642.1,e=0. HD 21120 03 22 07.12 +08 51 15.3 3.60 G6III 1654.9,e=0.26 HR 1608 04 57 28.36 -10 20 06.4 5.38 G4V+DA 903,e=0.3 HD 128220 14 32 56.64 +19 25 58.0 8.54 G0III+sdO9 870,e=0.13 KS Per 04 45 20.09 +43 11 19.0 7.76 A5Iap 360 mu Sgr 18 10 46.32 -21 04 25.4 3.85 B2III 138 3 Pup 07 41 47.96 -28 50 03.2 3.96 A3Iabe 137.8 DR Dra 17 34 07.54 +74 15 49.2 6.55 K0III+DB (RS CVn) 31.5 alp Oct 20 58 44.04 -77 13 01.2 5.15 A7III+ 9.073 zet Cap: Barstow et al. 1994; ksi01 Cet: Boffin, Cerf, & Paulus 1993; HD 21120: Boffin, Cerf, & Paulus 1993; HR 1608: Landsman, Simon, & Bergeron 1993; Barstow et al. 1994; HD 128220: Boffin, Cerf, & Paulus 1993; KS Per: Iben & Tutukov 1993; mu Sgr: Iben & Tutukov 1993; Berghoefer, Schmitt, & Cassinelli 1996; 3 Pup: Iben & Tutukov 1993; Rovero & Ringuellet 1994; Plets, Waelkens, & Trams 1995; DR Dra: Fekel & Simon 1985; Singh et al. 1996; alp Oct: Malina et al. 1994; Bowyer et al. 1996 8b.a) Kitt Peak Downes survey (Downes 1986, 1987): RA(1950) DEC(1950) V Sp.type Comments KPD 1905+1144 19 05 59 +11 44.6 14.52 sdB flat cont,like FGL84 KPD 2053+5632 20 53 07 +56 32.1 14.35 sdB flat cont,like FGL84 Note: All 46 KPD subdwarfs, none known to be composite, could use further observations, since Downes (1987) considered this a probable underestmate. 8b.b) ``The stars with H-alpha missing'' (Downes 1987). These may be binaries, with H alpha in emission on the heated side of the secondary: RA(1950) DEC(1950) V Sp.type Comments KPD 0111+5200 01 11 14 +52 00 38.0 16.45 sdB no H alpha KPD 0716+0258 07 16 18 +02 58.3 14.91 sd weak H alpha KPD 0728+0530 07 28 35 +05 30 12.7 15.90 sdB no H alpha KPD 1943+4058 19 43 38 +40 58.7 14.87 sdB weak H alpha KPD 1955+4636 19 55 02 +46 36 31.7 16.26 sdB no H alpha KPD 1956+4802 19 56 16 +48 02 40.7 16.31 sdB no H alpha KPD 2022+5317 20 22 37 +53 17 52.6 16.10 sdB no H alpha KPD 2023+5239 20 23 52 +52 39 38.5 15.63 sdB no H alpha 8c) Kiso survey (Wegner et al. 1985 - 1996). This may be a complete sample, when the spectroscopic follow-up for the sample is completed: RA(1950) DEC(1950) V Sp.type Comments KUV 00311-1938 00 31 03.96 -19 38 06.6 16.43 cv? KUV 03036-0043 03 03 34.13 -00 42 47.0 15.8 DA+DM PB 7003 KUV 03134-0001 03 13 26.42 -00 01 14.7 16.3 cont.+dM KUV 03302-0143 03 30 11 -01 42.9 17.3 DA + comp? KUV 03434+0106 03 43 21.72 +01 05 53.2 17.26 sdB+M KUV 03580+0614 03 57 57.14 +06 14 21.4 15.5 CV? KUV 04304+1339 04 30 22 +13 38 56 16.4 DA+DM KUV 13030+2734 13 03 02.14 +27 34 16.1 15.3 narrow em, z=0? KUV 14174+2601 14 17 23.94 +26 01 08.5 14.3 sdB+dM KUV 16008+1708 16 00 48.19 +17 08 07.4 16.8 sdODe? KUV 16195+4125 16 19 32 +41 25 11 16.8 DA+dM KUV 18332+6429 18 33 14.0 +64 29 27 16.9 DA+dM KUV 23012+1702 23 01 13.16 +17 01 44.1 16.0 sdBe 8d) LBQS survey (Berg et al. 1992). This may be a complete sample, when the spectroscopic follow-up for the sample is completed: RA(1950) DEC(1950) V Sp.type Comments LBQS 0025-0026 00 25 16.20 -00 26 59.4 18.3Bj sd+dM LBQS 1144+0111 11 44 00.09 +01 11 50.1 18.3Bj DA+dMe * LBQS 1216+1628 12 16 56.02 +01 11 50.1 18.1Bj sd+dM LBQS 1218+1140 12 18 38.75 +11 40 46.5 18.2Bj Emission * LBQS 1231+1333 12 31 57.74 +13 33 30.4 18.4Bj DAe * LBQS 1232+1335 12 32 27.86 +13 35 34.6 16.8Bj DA+dM LBQS 1234+1642 12 34 21.63 +16 42 46.0 18.4Bj sd+dM * LBQS 1320-0239 13 20 37.73 -02 39 17.9 18.0Bj sd+dM LBQS 1327-0242 13 27 02.16 -02 42 33.4 18.3Bj DA+dM * LBQS 1440-0231 14 40 59.33 -02 31 11.9 16.7Bj DA+dMe * LBQS 2348+0232 23 48 31.85 +02 32 34.6 18.1Bj Emission * 8e) US survey (Usher 1981; Usher, Warnock, & Green 1983; Usher, Mitchell, & Warnock 1988) (cf. P. Usher, private comm.): RA(1950) DEC(1950) V Sp.type Comments US 527 13 15 25.8 +30 19 01 17.1B WD+dM US 1953 08 53 00.1 +45 11 41 17.6B dG US 2025 08 55 02.8 +45 19 13 14.7B G US 3685 03 05 28.7 +17 07 03 17.4B comp? 8f) Composite-spectrum subdwarfs from the compilation Kilkenny, Heber, & Drilling (1988), including KPD and PB, but excluding PG: RA(1950) DEC(1950) V Sp.type Comments PB 6148 00 42.8 +06 50 12.B F+sd? BD-11 162 00 49.7 -10 56 11.20 sdO+G PHL 6783 PB 8555 01 07.7 -14 24 sd+F? PHL 3802 01 46.4 -26 52 12.34 sdOB+K0 PS 336 SB 744 HDE 283048 03 50.3 +25 36 10.24 sd+F? HD 45166 06 23.5 +08 01 9.88 B8Ve+sdO? BD+35 1543 07 06.8 +34 30 sdB+F BD+10 2357 11 53.4 +10 07 sdO+A PB 3854 12 06 44 +16 28 33 sdB+? HD 113001 12 58.1 +36 02 10.58 sdO+F Feige 80 13 17 25 +12 19 46 11.4 sdO+A? TON 817 16 31 47 +26 39 01 sdB+G BD+29 3070 17 36.4 +29 10 sdOB+F 8g) Subwarfs with companions found in high-S/N spectra (Saffer et al. 1994): RA(1950) DEC(1950) V Sp.type Comments PG 1323-085 13 23 02.0 -08 33 41 12.63B sdB-O PG 1704+221 17 04 39.4 +22 09 44 11.77B sdB-O PG 2214+183 22 14 40.3 +18 22 54 13.57 sd 8h) Subwarfs with companions found in high-S/N spectra (Moehler et al. 1990): RA(1950) DEC(1950) V Sp.type Comments PG 0314+146 03 14 51.1 +14 35 28 10.64B sdOB PG 1618+563 16 18 10.0 +56 15 32 11.31 sdB N OBJ 8i) WDs with companions found in spectra by Bragaglia et al. (1990): RA(1950) DEC(1950) V Sp.type Comments WD 0034-211 00 34 56 -21 10.1 14.53 WD+dMe triple? LTT 329 WD 1555-089 15 55 22 -08 59.5 14.80 DA+MS WD 1620-391 16 20 10.0 -39 06 49 10.98 DA+MS 8j) WDs with companions found with photometry by Probst (1983): RA(1950) DEC(1950) V Sp.type Comments Gr 310 01 47 22 +67 24.6 14.42 DAw EUVE J0151+676 G 39-27 04 33 39 +27 03.9 15.94 DC LP 60-359 08 52.4 +63 02 15.7 DA triple L 898-25 10 55 07 -07 15.4 14.27 DA G 147-65 11 33 05 +35 50.9 16.1 DC+dM BPM 94172 19 19 23 +14 34.9 13.01 DA 8k) Shows red excess (Cheselka et al. 1993): RA(1950) DEC(1950) V Sp.type Comments PG 1301+545 13 01 23.0 +54 28 45 15.51 DA 2 LB 248 PG 1305+018 13 05 21.5 +01 48 09 15.16 DA 2 8l) WDs found to have companions by Zuckerman, Becklin, and collaborators: 8l.a) Schultz, Zuckerman, & Becklin (1996) (SZB96) (Radial velocity study): RA(1950) DEC(1950) V Sp.type Comments [LTT 2980] 07 52.8 -14 38 13.5 DA close? [PG 1001+204] 10 01 18.7 +20 23 43 16.07B DA+K Ton 1150 [PG 1210+464] 12 10 28.8 +46 26 29 15.61B COMP DA [G 93-53] 21 51 32 -01 31.3 14.41 DAs close LTT 8747 [KPD 2154+4048] 21 54 13 +40 48.5 15.22 DA close 8l.b) Zuckerman & Becklin (1992): RA(1950) DEC(1950) V Sp.type Comments BPM 06502 10 42.6 -69 02 13.09B DA [GD 337] 14 33 06 +53 48.5 16.09 DA+ PG 1433+538 G 29-38 23 26 16 +04 58.5 13.03 DA ZZ Psc The secondary in G29-38 is a brown dwarf candidate (Kleinman et al. 1994). 8m) White dwarf binaries from McCook & Sion (1987). This includes composite & spectroscopic binaries only; known visual binaries, CPM pairs, PG composites and other systems in samples above have been excluded: RA(1950) DEC(1950) V Sp.type Comments WD 0906+296 09 06 20.1 +29 41.8 16.1pg DA WD 1249+296 12 49 10.1 +29 37.3 16.7pg DA 8n) Miscellaneous composites, scattered about the literature: RA(1950) DEC(1950) V Sp.type Comments EUVE J0356-36.6 03 54 37.6 -36 50 18 18.5 DA+G2V EG 81 11 34 51.3 +14 26 58 13.21 sdO+comp CBS 47 11 35 44 +32 41.6 16. DA+dM EUVE J0356-36.6: Christian et al. 1996; EG 81: Massey, Strobel, Barnes, & Anderson 1988; CBS 47: Sion et al. 1987 9) Planetary nebulae with cool or unusual central stars, excluding known symbiotics and luminous blue variables (Acker et al. 1982, 1992): Central star RA(1950) DEC(1950) V Sp.type Nebula 00 25 30.2 +55 41 20 16.5 A Hu 1-1 [V664 Cas] 02 59 34.2 +64 41 45 13.38 close binary HFG 1 03 06 51.7 +62 36 43 12.61 A HDW 2 HD 281679 04 06 08.3 +30 38 43 9.42 sdO+A0III NGC 1514 05 14 46.0 +37 30 29 15.05 G IC 2120 LoTr 1 05 53 00.9 -22 54 27 14.B PK 228-22 1 UBV 6225 06 08 21.1 +11 47 30 15.24 F7 V? Abell 14 [V651 Mon] 07 06 49.7 -00 43 30 11.47 ? + A2 V NGC 2346 07 53 03.1 -23 29 47 15.72 cool star? M 3-4 08 29 51.9 -31 55 54 13.93 G-K K 1-1 LS 1340 09 41 50.7 -57 03 12 11.30 sdO+A2 III He 2-36 HD 87892 10 04 55.1 -40 11 29 10.07 A2 V NGC 3132 10 34 02.3 -64 03 30 15.66 cool star? He 2-51 [KV Vel] 10 52 28.97 -48 30 54 12.26 sdO + MV ESO 215-04 [LW Hya] 12 50 52.9 -22 36 05 9.63 ? + G8 IV Abell 35 [IN Com] 12 53 07.7 +26 09 44 8.8 sdO+G5 III LoTr 5 ScWe 2 13 52.3 -59 08 14 PN? B9V PK 311+02 2 CPD-53 8315 16 59 00.2 -53 51 31 11.54 F-G ? SaSt 2-12 [MT Ser] 17 26 10.2 -15 10 39 16.53 sdO + MV Abell 41 18 01 53. -29 19 42 14.74 cool star? ShWi 2-7 SS73 150 18 13 09.5 -27 05 37 K2 III M 1-44 [V477 Lyr] 18 29 18.4 +26 53 59 14.96 cl. bin O9 k Abell 46 18 32 53.5 -17 38 38 14.30 cool star? M 1-53 18 33 34.70 -19 22 00 13.27 A V-V 3-5 18 56 17. -00 37 06 14.00 A Sa 3-151 K 3-27 19 12 30.9 +28 35 33 13.84 G PK 061+08 1 SS 438 19 12 46. +17 17 30 13.42 ? + B9V WhMe 1 19 36 53.5 +15 49 54 14.12 cool star? Me 1-1 19 38 12.00 +18 42 18 ? late,var. K 3-43 [UU Sge] 19 39 55.2 +16 58 00 14.67 sdO + K-MV Abell 63 10) Unresolved detached double degenerates 10a) P(orb) known or suspected: RA(1950) DEC(1950) V Sp.type P(orb)(d) LB 11146 09 45 56.3 +24 35 29 14.32 DXP+DA long? G 177-31 13 17 04.1 +45 20 55 14.13 DA3 4.8 PG 1241-010 12 41 54.9 -01 02 34 14.0 DA3 3.3 GD 231 20 32 58 +18 49.1 15.34 DA3 2-10: L 870-2 01 35 26.1 -05 14 42 12.86 DA7+DA 1.55578 Eg 11 Feige 55 12 02 05 +60 48.4 13.57 DAO 1.49303 GD 360 17 13 43.8 +33 16 23 14.54 DA3+DA 1.1 GD 251 23 31 51.5 +29 02 06 15.86B DA3 0.167: PG 1101+364 11 01 35.3 +36 26 20 14.76B DA 3 0.1445833 WD 0957-666 09 57.8 -66 39 14.60 DA 0.0609931806 LB 11146: Glenn, Liebert, & Schmidt 1994; G 177-31: Marsh, Dhillon, & Duck 1995; PG 1241-010: Marsh, Dhillon, & Duck 1995; GD 231: Marsh, Dhillon, & Duck 1995; L 870-2: Saffer et al. 1988; Feige 55: Holberg et al. 1995; GD 360: Marsh, Dhillon, & Duck 1995; GD 251: Marsh, Dhillon, & Duck 1995; PG 1101+364: Marsh 1995; WD 0957-666: Moran, Marsh, & Bragaglia 1997 10b) P(orb) unknown: RA(1950) DEC(1950) V Sp.type Comments WD 0047-524 00 47.8 -52 25 14.16 DD? WD 0109-264 01 09 47.92 -26 29 22.2 13.13 DD? with He I MCT 0128-3846 01 28 14.4 -38 46 06 15.32 DAB G 4-34 02 39 26 +10 59.9 16.1B DA+DC WD 0346-011 03 46.3 -01 07 14.05 DD? MCT 0453-2933 04 53 38.5 -29 33 41 15.12 DAB WD 0839-327 08 39 35.9 -32 46 55 12.00 DD? WD 0940+068 09 40 16.4 +06 49 23 13.34B DD? PG 1022+050 10 22 24.1 +05 01 27 14.18 DD? G 62-46 13 30 17 +01 32.7 17.11 DA+DC GD 387 20 03 59 +43 45.7 16.0B DA+DC GD 402 22 16.8 +48 24 16.0B DA+DC WD 0047-524: Bragaglia et al. 1990; WD 0109-264: Bragaglia et al. 1990; MCT 0128-3846: Wesemael et al. 1994; G 4-34: Bergeron, Greenstein, & Liebert 1990; WD 0346-011: Bragaglia et al. 1990; MCT 0453-2933: Wesemael et al. 1994; WD 0839-327: Bragaglia et al. 1990; WD 0940+068: Bragaglia et al. 1990; PG 1022+050: Bragaglia et al. 1990; G 62-46: Bergeron, Ruiz, & Leggett 1993; GD 387: Bergeron, Greenstein, & Liebert 1990; GD 402: Bergeron, Greenstein, & Liebert 1990 Acknowledgments This research has made use of the Simbad database, operated at CDS, Strasbourg, France. Richard Wade made many thought-provoking comments. References Acker, A., Gleizes, F., Chopinet, M., Marcout, J., Ochsenbein, F., & Roques, J. M. 1982, Catalogue of the Central Stars of True and Possible Planetary Nebulae, Publ. Speciale C.D.S., 3 Acker, A., & Jasniewicz, G. 1990, A&A, 238, 325 Acker, A., & Stenholm, B. 1990, A&A, 233, L21 Acker, A., Ochsenbein, F., Stenholm, B., Tylenda, R., Marcout, J., & Schohn, C. 1992, Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (European Southern Observatory) Allard, F., Wesemael, F. Fontaine, G., Bergeron, P., & Lamontagne, R. 1994, AJ, 107, 1565 Barstow, M. A., Holberg, J. B., Fleming, T. A., Marsh, M. C., Koester, D., & Wonnacott, D. 1994, MNRAS, 270, 499 Barstow, M. A., Burleigh, M. R., Fleming, T. A., Holberg, J. B., Koester, D., Marsh, M. C., Rosen, S. R., Rutten, R. G. M., Sakai, S., Tweedy, R. W., & Wegner, G. 1995, MNRAS, 272, 531 Bell, S. A., Pollacco, D. L., & Hilditch, R. W. 1994, MNRAS, 270, 449 Berg, C., Wegner, G., Foltz, C. B., Chaffee Jr., F. H., Hewett, P. C. 1992, ApJS, 78, 409 Berger, J., & Fringant, A.-M. 1984, A&AS, 58, 565 Bergeron, P., Greenstein, J. L., & Liebert, J. 1990, ApJ, 361, 190 Bergeron, P., Ruiz, M.-T., & Leggett, S. K. 1993, ApJ, 407, 733 Bergeron, P., Saffer, R. A., & Liebert, J. 1992, ApJ, 394, 228 Berghoefer, T. W., Schmitt, J. H. M. M., & Cassinelli, J. P. 1996, A&AS, 118, 481 Bixler, J. V., Bowyer, S., & Laget M. 1991, A&A, 250, 370 Boffin, H. M. J., Cerf, N., & Paulus, G. 1993, A&A, 271, 125 Bois, B., Lanning, H. H., Mochnacki, S. W. 1988, AJ, 96, 157 Bond, H. E., & Grauer, A. D. 1987, in IAU Colloq. 95, The Second Conference on Faint Blue Stars, edited by A. G. D. Philip, D. S. Hayes, and J. W. Liebert (Schenectady, NY: L. Davis Press), p. 221 Bond, H. E., & Livio, M. 1990, ApJ, 355, 568 Bowyer, S., Lieu, R., Lampton, M., Lewis, J., Wu, X., Drake, J. J., & Malina, R. F. 1994, ApJS, 93, 569 Bragaglia, A., Greggio, L., Renzini, A., & D'Odorico, S. 1990, ApJ, 365, L13 Bues, L. 1987, Ap&SS, 130, 75 Catalan, M. S., Davey, S. C., Sarna, M. J., Smith, R. C., & Wood, J. H. 1994, MNRAS, 269, 879 Catalan, M. S., Sarna, M. J., Jomaron, C. M., & Smith, R. C. 1995, MNRAS, 275, 153 Chen, A., O'Donoghue, D., Stobie, R. S., Kilkenny, D., Roberts, G., & Van Wyk, F. 1995, MNRAS, 275, 100 Cheselka, M., Holberg, J. B., Watkins, R., Collins, J., & Tweedy, R. W. 1993, AJ, 106, 2365 Christian, D. J., Vennes, S., Thorstensen, J. R., & Mathioudakis, M. 1996, AJ, 112, 258 Costero, R., Tapia, M., Mendez, R. H., Echevarria, J., Roth, M., Quintero, A., Barral, J. F. 1986, Rex. Mex. Astr. Astrof, 13, 149 Darling, G. W., & Wegner, G. 1994, AJ, 108, 2025 Darling, G. W., & Wegner, G. 1996, AJ, 111, 865 De Kool, M., & Ritter, H. 1993, A&A, 267, 397 Downes, R. A. 1986, ApJS, 61, 569 Downes, R. A. 1987, ApJ, 316, 763 Downes, R. A., & Szkody, P. 1989, AJ, 97, 1729 Drilling, J. S. 1985, ApJ, 294, L107 Dworetsky, M. M., Lanning, H. H., Etzel, P. B., & Patenaude, D. J. 1977, MNRAS, 181, p13 Fekel, F. C., & Simon, T. 1985, AJ, 90, 812 Ferguson, D. H., & James, T. A. 1994, ApJS, 94, 723 Ferguson, D. H., Green, R. F., & Liebert, J. 1984, ApJ, 287, 320 Ferguson, D. H., Liebert, J., Cutri, R., Green, R. F., Willner, S. P., Steiner, J. E., & Tokarz, S. 1987, ApJ,316, 399 Fleming, T. A., Green, R. F., Jannuzi, B. T., Liebert, J., Smith, P. S., & Fink, H. 1993, AJ, 106, 1729 Fleming, T. A., Schmitt, J. H. M. M., Barstow, M. A., & Mittaz, J. P. D. 1991, A&A, 246, L47 Fulbright, M. S., Liebert, J., Bergeron, P., & Green, R. 1993, ApJ, 406, 240 Genova, R., Bowyer, S., Vennes, S., Lieu, R., Henry, J. P., & Gioia, I. 1995, AJ, 110, 788 Glenn, J., Liebert, J., & Schmidt, G. D. 1994, PASP, 106, 722 Grauer, A. D., & Bond, H. E. 1983, ApJ, 271, 259 Green, R. F., Liebert, J., & Wesemael, F. 1984, ApJ, 280, 177 Green, R. F., Schmidt, M., & Liebert, J. 1986, ApJS, 61, 305 Greenstein, J. L., & Liebert, J. 1990, ApJ, 360, 662 Hartl, H., & Tritton, S. B. 1985, A&A, 145, 41 Heber, U., Bade, N., Jordan, S., & Voges, W. 1993, A&A, 267, L31 Hodgkin, S. T., Barstow, M. A., Fleming, T. A., Monier, R., & Pye, J. P. 1993, MNRAS, 263, 229 Holberg, J. B., Saffer, R. A., Tweedy, R. W., & Barstow, M. A. 1995, ApJ, 452, L133 Hollis, J. M., Van Buren, D., Vogel, S. N., Feibelman, W. A., Jacoby, G. H., & Pedelty, J. A. 1996, ApJ, 456, 644 Hutchings, J. B., Crampton, D., Cowley, A. P., Schmidtke, P. C., McGrath, T. K., & Che Y.-H. 1995, PASP, 107, 931 Iben, I., & Tutukov, A. V. 1993, ApJ, 418, 343 Jasniewicz, G., Acker, A., Friere Ferrero, R., & Burnet, M. 1992, A&A, 261, 314 Jasniewicz, G., Lapierre, G., & Monier, R. 1994, A&A, 287, 591 Jasniewicz, G., Thevenin, F., Monier, R., & Skiff, B. A. 1996, A&A, 307, 200 Jeffrey, C. S., & Simon, T. 1997, MNRAS, 286, 487 Jeffries, R. D., & Stevens, I. R. 1996, MNRAS, 279, 180 Kawaler, S. D., O'Brien, M. S., Clemens, J. C., Nather, R. E., Winget, D. E., Watson, T. K., Yanagida, K., Dixson, J. S., Bradley, P. A., Wood, M. A., Sullivan, D. J., Kleinman, S. J., Meistas, E., Leibowitz, E. M., Moskalik, P., Zola, S., Pajdosz, G., Krzesinski, J., Solheim, J.-E., Bruvold, A., O'Donoghue, D., Katz, M., Vauclair, G., Dolez, N., Chevreton, M., Barstow, M. A., Kanaan, A., Kepler, S. O., Giovanni, O., Provencal, J. L., & Hansen, C. J. 1995, ApJ, 450, 350 Kellett, B. J., Bromage, G. E., Brown, A., Jeffries, R. D., James, D. J., Kilkenny, D., Robb, R. M., Wonnacott, D., Lloyd, C., & Clayton, C. 1995, ApJ, 438, 364 Kilkenny, D. 1986, Observatory, 106, 160 Kilkenny, D., Heber, U., & Drilling, J. S. 1988, SAAOC, 12, 1 Kilkenny, D., Marang, F., & Menzies, J. W. 1994, MNRAS, 267, 535 Kleinman, S. J., Nather, R. E., Winget, D. E., Clemens, J. C., Bradley, P. A., Kanaan, A., Provencal, J. L., Claver, C. F., Watson, T. K., Yanagida, K., Dixson, J. S., Wood, M. A., Sullivan, D. J., Meistas, E., Leibowitz, E. M., Moskalik, P., Zola, S., Pajdosz, G., Krzesinski, J., Solheim, J.-E., Bruvold, A., O'Donoghue, D., Katz, M., Vauclair, G., Dolez, N., Chevreton, M., Barstow, M. A., Kepler, S. O., Giovannini, O., Hansen, C. J., & Kawaler, S. D. 1994, ApJ, 436, 875 Kudritzki, R. P., & Simon, K. P. 1978, A&A, 70, 653 Kudritzki, R. P., Simon, K. P., Lynas-Gray, A. E., Kilkenny, D., & Hill, P. W. 1982, A&A, 106, 254 Landolt, A. U., & Drilling, J. S. 1986, AJ, 91, 1372 Landsman, W., Simon, T., & Bergeron, P. 1993, PASP, 105, 841 Landsman, W., Simon, T., & Bergeron, P. 1996, PASP, 108, 250 Liebert, J., Tweedy, R. W., Napiwotzki, R., & Fulbright, M. S. 1995, ApJ, 441, 424 Livio, M., Shara, M. M., 1987, ApJ, 319, 81 Malina, R. F., Marshall, H. L., Antia, B., Christian, C. A., Dobson, C. A., Finley, D. S., Fruscione, A., Girouard, F. R., Hawkins, I., Jelinsky, P., Lewis, J. W., McDonald, J. S., McDonald, K., Patterer, R. J., Saba, V. W., Sirk, M., Stroozas, B. A., Vallerga, J. V., Vedder, P. W., Wiercigroch, A., & Bowyer, S. 1994, AJ, 107, 751 Marsh, M. C., Barstow, M. A., Buckley, D. A., Burleigh, M. R., Holberg, J. B., Koester, D., O'Donoghue, D., Penny, A. J., & Sansom, A. E. 1997, MNRAS, 286, 369 Marsh, T. R. 1995, MNRAS, 275, L1 Marsh, T. R., Dhillon, V. S., & Duck, S. R. 1995, MNRAS, 275, 828 Marsh, T. R., & Duck, S. R. 1996, MNRAS, 278, 565 Mason, K. O. Hassall, B. J. M., Bromage, G. E., Buckley, D. A. H., Naylor, T., O'Donoghue, D., Watson, M. G., Bertram, D., Branduardi-Raymont, G., Charles, P. A., Cooke, B., Elliott, K. H., Hawkins, M. R. S., Hodgkin, S. T., Jewell, S. J., Jomaron, C. M., Sekiguchi, K., Kellett, B. J., Lawrence, A., McHardy, I., Mittaz, J. P. D., Pike, C. D., Ponman, T. J., Schmitt, J., Voges, W., Wargau, W. & Wonnacott, D. 1995, MNRAAS, 274, 1194 Massey, P., Strobel, K., Barnes, J. V., & Anderson, E. 1988, ApJ, 328, 315 McCook, G. P., & Sion, E. M. 1987, 1987, ApJS, 65, 603 Misselt, K. A., & Shafter, A. W. 1995, AJ, 109, 1757 Moehler, S., Richtler, T., De Boer, K. S., Dettmar, R. J., & Heber, U. 1990, A&A, 86, 53 Moffat, A. F. J., Lamontagne, R., Seggewiss, W. 1982, A&A, 114, 135 Moran, C., Marsh, T. R., & Bragaglia, A. 1997, MNRAS, accepted Orosz, J. A., & Wade, R. A. 1997, in preparation Plets, H., Waelkens, C., & Trams, N. R. 1995, A&A, 293, 363 Pollacco, D. L., & Bell, S. A. 1994, MNRAS, 267, 452 Pollacco, D. L., & Bell, S. A. 1997, MNRAS, 284, 32 Probst, R. G. 1983, ApJS, 53, 335 Pye, J. P., McGale, P. A., Allan, D. J., Barber, C. R., Bertram, D., Denby, M., Page, C. G., Ricketts, M. J., Stewart, B. C., & West, R. G. 1995, MNRAS, 274, 1165 Reid, N., Saffer, R. A., & Liebert, J. 1993, in White Dwarfs: Advances in Observation & Theory, edited by M. A. Barstow (Kluwer, Dordrecht), p. 441 Ringwald, F. A. 1993, Ph.D. thesis, Dartmouth College Ringwald, F. A. 1994, in Interacting Binary Stars, edited by A. W. Shafter (San Francisco: A. S. P. Conf. Ser., Vol. 56), p. 294 Ringwald, F. A. 1997, in preparation Ringwald, F. A., & Abbott, T. M. C. 1997, in preparation Ritter, H. 1986, A&A, 169, 139 Ritter, H. 1990, A&AS, 85, 1179 Rovero, A. C., & Ringuellet, A. E. 1994, MNRAS, 266, 203 Saffer, R. A., Bergeron, P., Koester, D., & Liebert, J. 1994, ApJ, 432, 351 Saffer, R. A., Liebert, J., & Olszewski, E. W. 1988, ApJ, 334, 947 Saffer, R. A., Wade, R. A., Bechtold, J., Foss, D., & Kidder, K. 1993, AJ, 105, 1945 Schmidt, G. D., Smith, P. S., & Harvey, D. A. 1995, AJ, 110, 398 Schoenberner, D. 1978, A&A, 70, 451 Schultz, G., Zuckerman, B. & Becklin, E. E. 1996, ApJ, 460, 402 Shipman, H. L., & Wegner, G. A. 1979, Nature, 281, 126 Simon, T., Fekel, F. C., & Gibson, D. M. 1985, ApJ, 295, 153 Singh, K. P., Drake, S. A., White, N. E., & Simon, T. 1996, AJ, 112, 221 Sion, E. M., Wagner, R. M., Liebert, J., & Starrfield, S. G. 1987, Mem. Soc. Astron. Ital., 58, 89 Skillman, D. R., & Patterson, J. 1988, AJ, 96, 976 Smalley, B., Kellett, B. J., Wonnacott, D., & Stickland, D. J. 1997, MNRAS, 284, 457 Smalley, B., Smith, K. C., Wonnacott, D., & Allen, C. S. 1996, MNRAS, 278, 688 Stauffer, J. R. 1987, AJ, 94, 996 Theissen, A., Moehler, S., Heber, U., & De Boer, K. S. 1993, A&A, 273, 524 Theissen, A., Moehler, S., Heber, U., Schmidt, J. H. K. & De Boer, K. S. 1995, A&A, 298, 577 Thejll, P., MacDonald, J., & Saffer, R. 1991, A&A, 248, 448 Thejll, P., Ulla, A., & MacDonald, J. 1995, A&A, 303, 773 Thorstensen, J. R., Vennes, S., & Bowyer, S. 1996, ApJ, 457, 390 Thorstensen, J. R., Vennes, S., & Shambrook, A. 1994, AJ, 108, 1924 Tobin, W., Viton, M., & Sivan, J.-P. 1994, A&AS, 107, 385 Tweedy, R. W., Holberg, J. B., Barstow, M. A., Bergeron, P., Grauer, A. D., Liebert, J., & Fleming, T. A. 1993, AJ, 105, 1938 Usher, P. D. 1981, ApJS, 46, 117 Usher, P. D., Mitchell, K. J. & Warnock III, A. 1988, ApJS, 66, 1 Usher, P. D., Warnock, A., & Green, R. F. 1983, ApJ, 269, 73 Van der Hucht, K. A., Jurriens, T. A., Olnon, F. M., The, P. S., Wesselius, P. R., & Williams, P. M. 1985, A&A, 145, L13 Viton, M., Deleuil, M., Tobin, W., Prevot, L., & Bouchet, P. 1991, A&A, 242, 175 Wade, R. A., & Potter, D. 1995, BAAS, 186, 4701 Warner, B. 1995, Cataclysmic Variables, Cambridge Univ. Press, Cambridge Wegner, G., & Boley, F. I. 1993, AJ, 105, 660 Wegner, G., & Dupuis, J. 1993, AJ, 106, 390 Wegner, G., & McMahan, R. K. 1985, AJ, 90, 1511 Wegner, G., & McMahan, R. K. 1986, AJ, 91, 139 Wegner, G., & McMahan, R. K. 1988, AJ, 96, 1933 Wegner, G., McMahan, R. K., & Boley, F. I. 1987, AJ, 94, 1271 Wegner, G., & Swanson, S. R. 1990a, AJ, 99, 330 Wegner, G., & Swanson, S. R. 1990b, AJ, 100, 1274 Wegner, G., & Swanson, S. R. 1991, ApJS, 75, 507 Wesemael, F., Bergeron, P., Lamontagne, R., Fontaine, G., Beauchamp, A., Demers, S., Irwin, M. J., Holberg, J. B., Kepler, S. O. & Vennes, S. 1994, ApJ, 429, 369 Wesemael, F., Fontaine, G., Bergeron, P., Lamonagne, R., & Green, R. F. 1992, AJ, 104, 203 Wonnacott, D., Kellett, B. J., & Stickland, D. J. 1993, MNRAS, 262, 277 Wood, J. H., Robinson, E. L., & Zhang, E.-H. 1995, MNRAS, 277, 87 Wood, J. H., Zhang, E.-H., & Robinson, E. L. 1993, MNRAS, 261, 103 Vennes, S., & Thorstensen, J. R. 1994a, AJ, 108,1881 Vennes, S., & Thorstensen, J. R. 1994b, ApJ, 433, L29 Vennes, S., & Thorstensen, J. R. 1996, AJ, 112, 284 Zuckerman, B., & Becklin, E. E. 1992, ApJ, 386, 260