COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS Number 2926 Konkoly Observatory Budapest 22 August 1986 HU ISSN 0374 - 0676 IDENTIFICATIONS AND ASTROMETRIC POSITIONS OF CATACLYSMIC BINARIES AND RELATED OBJECTS The catalogue by Ritter (ref. 1) contains many variables with semi-precise positions and inadequate finder charts in the published literature. The following positions for some of these stars were measured on a Coradograph measuring machine at the RGO using glass copies of the PSS. An average of 19 AGK3 stars within a 2 degree square centred on the variable were used in the reductions, but in the cases of MT Ser, V794 Aql and VW Pyx, SAO positions were used. Photographic finder charts are included for five of these stars. Full details and an extensive bibliography for all but two of these stars are given in ref. l. STAR DESIGNATIONS Five of the stars in ref. 1 plus Huruhata's star in ref. 4 have been designated in the 67th name list (ref. 24) and are given their new designations in the table. The list below gives the designations used in ref. 1. V363 Aur = Lanning 10 SW Sex = PG1012-029 DO Dra = PG1140+719 V795 Her = PG1711+336 MT Ser = Abell 41 NOTES ON INDIVIDUAL STARS EG Cnc The discovery of this star was reported by Masaaki Huruhata in ref. 4. Only one maximum to mv 11.9 in Nov. 1977 is known. A photo showing the star in outburst was kindly supplied by Huruhata, allowing an unambiguous identification of the star on the PSS. The approximate magnitudes on the PSS prints are 18.6 (red) and 18.0 (blue). The magnitudes given by Huruhata in ref. 4 seem to refer to a star 26" E and 3" N of the variable. From the rate of decline of 2 magnitudes in 20 days, a range of over 6 mags., and the blue colour on the PSS, a similarity to WZ Sge, UZ Boo and WX Cet is suggested (see ref. 20). A photographic chart is published here. STAR TYPE^1 R.A.(1950.0) RMS DEC.(1950.0) RMS EPOCH IDENT^2 1900+ TY Psc DN,SU 01h22m50.38 +-.3 +32d07'34"9 +-.2 49.97 (2) V363 Aur NL,UX 05 30 09.77 .3 +36 57 29.4 .3 54.90 (3) EG Cnc (DN?) 08 40 03.26 .4 +28 02 39.2 .3 53.94 (4)* AC Cnc NL 08 41 41.70 .3 +13 03 26.1 .3 51.91 (5)* BZ UMa (DN) 08 49 52.36 .4 +58 00 03.9 .3 54.91 (6) VW Pyx PN,DS 08 55 38.57 .5 -28 45 58.0 .5 56.19 (7) SW Sex NL,UX 10 12 37.22 .7 -02 53 35.1 .5 52.09 (8) DO Dra NL,XS 11 40 48.88 .4 +71 57 58.5 .4 53.28 (9)* UX CVn DS,DE 12 12 17.71 .4 +36 55 29.7 .3 56.35 (10) Case 1 DS 12 13 16.30 .2 +52 47 47.8 .4 55.29 (11) LX Ser NL,UX 15 35 45.00 .3 +19 01 48.6 .3 50.29 (12) V795 Her NL 17 11 05.73 .3 +33 34 48.5 .3 54.51 (8) MT Ser PN,DS 17 26 10.26 .5 -15 10 43.1 .5 54.58 (13) V380 Oph NL 17 47 46.91 .2 +06 06 17.5 .2 53.61 (14)* V477 Lyr PN,DS 18 29 18.43 .2 +26 53 59.2 .2 51.53 (15) UU Sge PN,DS 19 39 54.99 .5 +16 58 07.5 .5 50.54 (16) RZ Sge DN,SU 20 01 02.31 .2 +16 54 23.3 .3 51.72 (17) V794 Aql NL,UX,AD 20 14 56.57 .3 -03 49 11.9 .2 51.51 (17) CM Del DN,UG 20 22 39.93 .4 +17 08 07.0 .4 51.52 (17) V751 Cyg NL,UX,AD 20 50 26.65 .3 +44 08 04.5 .3 54.51 (18) V425 Cas -- 23 01 34.91 .4 +53 01 04.5 .5 53.83 (19) 1 - Type as given in Ritter (ref.1). See below. Brackets indicate stars not in his catalogue, i.e. stars with no established orbital period. 2 - References to the published charts used to identify the variable. An asterisk indicates a photographic finder chart in this paper. TYPE AD - Anti-dwarf nova = VY Scl object, subtype of NL DE - Doubly evolved system i.e. both components are highly evolved DN - Dwarf nova DS - Detached system NL - Nova-like variable PN - Central star of a planetary nebula SU - SU UMa star, subtype of DN UG - Dwarf nova of either U Gem or SS Cyg subtype UX - UX UMa star, subtype of NL XS - X-ray source [FIGURE 1] [FIGURE 2] [FIGURE 3] V363 Aur = Lanning 10 It is noted that the declination of this star is some 0.5 arcminute south of the position given in refs. 1 and 3, and that the R.A. in ref. 1 is grossly different. However as ref. 3 provides an identification chart arid the measurement was checked against a second plate, it is believed that the positions in refs. 1 and 3 are in error. DO Dra = PG1140+719 = 3A1148+719 = 2A1150+719 not equal YY Dra The initial confusion between this star and the "lost" variable YY Dra (discovered by Tsesevich on Pulkova plates of Z Dra) has been cleared by Wenzel (refs. 9, 21). Examination of plates at the epoch of Tsesevich's discovery may reveal the identity of YY Dra. A photographic chart of DO Dra is published here. Case 1 Ref. 11 notes a total proper motion of 0.11 arcseconds/year. Outbursts of up to 0.7 mag. in B are reported in ref. 23. CHARTS All charts are from the Palomar Sky Survey. The scale and orientation are the same for all charts and is indicated. Charts copied from the blue prints are labelled (PSS 0) and those from the red (PSS E). (Figs. 1-3). I acknowledge the valuable help of Bob Argyle and Dave King and thank the RGO for access to the facilities. ROBERT H. McNAUGHT c/o U.K. Earth Satellite Research Unit, Siding Spring Observatory, Coonabarabran, N.S.W. 2357, Australia References: 1 - Ritter, H. 1984, "Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (third edition)", Astr. and Ap. Suppl. Ser., 57, 385. [BIBCODE 1984A&AS...57..385R ] 2 - AAVSO chart supplied by Janet Mattei, AAVSO, 25 Birch Street, Cambridge, Mass., 02138, U.S.A. 3 - Lanning, H.H. 1973, P.A.S.P. 85, 70. [BIBCODE 1973PASP...85...70L ] 4 - Huruhata, M. 1983, I.B.V.S. 2401. 5 - Kurochkin, N.E. and Shugarov, S.Yu. 1980, Astron. Tsirk. No. 1114. [BIBCODE 1980ATsir1114....1K ] 6 - Markarian, B.E. 1968, Astrofizika, 4, 144. 7 - Acker, A., Gleizes, F., Chopinet, M., Marcout, J., Ochsenbein, F., and Roques, J.M. 1983, Complement 2 to the "Catalogue of Central Stars of True and Possible Planetary Nebulae", Obs. de Strasbourg, Publ. Speciale du C.D.S. No. 3. [BIBCODE 1982CDSSP...3.....A ] 8 - Green, R.F., Ferguson, D.H., Leibert, J., and Schmidt, M. 1982, P.A.S.P., 94, 560. [BIBCODE 1982PASP...94..560G ] 9 - Wenzel, W. 1983, M.V.S., 9, 141. 10- Gaposchkin, S. 1962, A.J. 67, 360. [BIBCODE 1962AJ.....67..360G ] 11- Stephenson, C.B. 1971, in "White Dwarfs", Luyten, W.J., Ed., I.A.U. Symp. No. 42, 61. [BIBCODE 1971IAUS...42...61S ] 12- Stepanian, J.A. 1979, I.B.V.S. 1630. 13- Grauer, A.D. and Bond, H.E. 1983, Ap.J., 271, 259. [BIBCODE 1983ApJ...271..259G ] 14- Hoffmeister, C. 1929, Sonneberger Mitt. No. 16. 15- Kurochkin, N.E. 1980, Astron. Tsirk. No. 1143. [BIBCODE 1980ATsir1143....3K ] 16- Bond, H.E., Liller, W., and Mannery, E.J. 1978, Ap.J., 223, 252. [BIBCODE 1978ApJ...223..252B ] 17- Vogt, N. and Bateson, F.M. 1982 Astr. and Ap. Suppl. Ser., 48, 383. [BIBCODE 1982A&AS...48..383V ] 18- Herbig, G.H. 1958, Ap.J., 128, 259 (star no. 170). [BIBCODE 1958ApJ...128..259H ] 19- Hoffmeister, C. 1967, A.N., 289, 205 (star S9712 Cas). [BIBCODE 1967AN....289..205H ] 20- Bailey, J. 1979, M.N.R.A.S., 189 Short communication, 41p. [BIBCODE 1979MNRAS.189P..41B ] 21- Wenzel, W. 1983, I.B.V.S. 2262. 22- Williams, G. 1983, Ap.J.Suppl.Ser. 53, 523 (referred to as YY Dra). [BIBCODE 1983ApJS...53..523W ] 23- Shugarov, S.Yu. 1984, I.B.V.S. 2612. 24- Kholopov, P.N., Samus, N.N., Kazarovets, E.V., and Perova, N.B. 1985, I.B.V.S. 2681.