COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 2991 Konkoly Observatory Budapest 2 March 1987 HU ISSN 0374-0676 THE LIST OF THE NEAREST AND BRIGHT ECLIPSING BINARIES FROM THE HIPPARCOS PROGRAM In the previous paper (Dworak and Oblak, 1984) we gave a review of arrangements of astrometric HIPPARCOS program. The HIPPARCOS satellite will be launched on a geostationary orbit in the beginning of 1988. Technical data were also briefly described in that paper. Our program (No 00177) of observations of the nearest eclipsing binaries (and also bright systems which are included into the standard program), extensively presented in the previous paper, has been accepted by the Organizing Committee of the HIPPARCOS Project. The planned observations will serve for determination of heliocentric parallaxes of these stars as well as for determination of their geometric and physical parameters and to verification of the modified mass-luminosity relation (Brancewicz and Dworak, 1980). To obtain homogenous results for such parameters the new or additional observations of eclipsing binaries from the HIPPARCOS program are very needed. Table I contains a revised list of the nearest and also bright eclipsing binaries for which photometric or spectrometric (or both) observations will be necessary in further elaborations. Especially the determination of spectral type and luminosity class for secondary components of eclipsing systems is needed to estimate their effective temperatures. The solution of light curve from photoelectric observations is also needed for the determination of geometric parameters of each eclipsing system. The consecutive columns of Table I contain: name and type of the star (EA - an Algol-type, EB - Beta-Lyr-type, EW - W UMa-type, E - an eclipsing binary without determined type), co-ordinates for the epoch 2000.0, observations needed (photometric, spectrometric or both), and the year of the last observation. The data for this list are taken from General Catalogue of Variable Table I The nearest and bright eclipsing binaries for which new or additional observations are needed (spec., phot., or both) Name Type RA D Obs. Year of (2000.0) needed last obs. RT AND EA 23h10m51s +53d01'5 spec. 1986 AN AND EB 23 18 23 +41 46.3 both 1980 BX AND EA 20 09 01 +40 47.9 both 1983 BW AQR EA 22 23 17 -15 20.1 both 1985 DV AQR EB 20 58 42 -14 29.3 spec. 1984 DX AQR EA 22 02 27 -16 58.1 spec. 1981 EE AQR EB 22 34 42 -19 51.6 both 1985 QS AQL EA 19 41 06 +13 48.7 spec. 1980 R ARA EA 16 39 42 -57 00.2 both -- V535 ARA EW 17 38 05 -56 49.8 spec. 1984 RR ARI EA 1 55 50 +23 34.8 both -- HS AUR EA 6 51 19 +47 41.0 phot. 1983 IM AUR EA 5 15 29 +46 24.9 spec. 1983 TZ B00 EW 15 08 10 +39 57.9 spec. 1983 VW B00 EW 14 17 26 +12 33.2 both 1983 44i B00 EW 15 03 49 +47 39.0 phot. 1985 SV CAM EA 6 41 27 +82 17.8 phot. 1986 VZ CVN EA 13 32 04 +28 34.8 spec. 1986 R CMA EA 7 19 27 -16 23.3 spec. 1986 EX CAR EA 10 25 00 -63 38.2 both 1924 AR CAS EA 23 30 00 +58 32.9 spec. 1947 CW CAS EW 0 45 56 +65 05.3 spec. 1981 RR CEN EW 14 16 54 -57 51.5 spec. 1984 V716 CEN EB 14 13 56 -54 37.8 spec. 1984 V752 CEN EW 11 42 46 -35 49.0 both 1986 XZ CEP EB 22 32 25 +67 08.9 both 1982 EM CEP EW 21 53 48 +62 36.8 spec. 1982 AA CET EW 1 59 01 -22 55.1 both 1986 RZ CHA EA 10 42 35 -82 02.4 phot. 1980 epsilon CRA EW 18 58 44 -37 06.8 spec. 1983 SX CRV EW 12 40 14 -18 48.0 spec. -- V346 CYG EA 20 19 25 +36 20.1 both 1971 V1061 CYG EA 21 07 20 +52 02.8 both 1986 V1362 CYG E 20 03 41 +36 25.5 both -- RW DOR EW 5 18 30 -68 13.6 both 1982 TW DRA EA 15 33 50 +63 54.3 phot. 1986 AI DRA EA 16 56 18 +52 41.7 spec. 1986 BV DRA EW 15 11 53 +61 50.4 spec. 1984 BW DRA EW 15 11 53 +61 50.7 spec. 1984 CM DRA EA 16 34 24 +57 09.0 spec. 1985 YY ERI EW 4 12 09 -10 27.7 phot. 1985 CO ERI EA 2 35 39 -45 04.0 both 1963 TZ FOR EA 3 14 40 -35 33.5 phot. -- GX GEM EB 6 46 08 +34 25.0 both -- RV GRU EW 22 39 26 -46 52.5 both -- Z HER EA 17 58 07 +15 08.2 spec. 1979 V624 HER EA 17 44 17 +14 24.4 spec. 1984 GK HYA EA 8 30 50 + 2 16.5 spec. 1961 SU IND EW 20 54 41 -45 43.9 both -- TX LEO EA 10 35 03 + 8 39.1 spec. 1967 AM LEO EW 11 02 11 + 9 53.8 spec. 1986 AP LEO EW 11 05 04 + 5 09.2 spec. -- ES LIB EB 15 16 47 -13 02.6 spec. 1980 delta LIB EA 15 00 58 - 8 31.2 spec. 1982 TZ LYR EB 18 15 50 +41 06.6 spec. 1986 FL LYR EA 19 12 05 +46 19.4 spec. 1983 TY MEN EW 5 26 50 -81 35.3 spec. 1980 UX MEN EA 5 30 01 -76 15.0 phot. 1973 V566 OPH EW 17 56 52 + 4 59.1 spec. 1986 V839 OPH EW 18 09 21 + 9 08.0 both 1985 V1010 OPH EB 16 49 28 -15 45.4 both 1984 ER ORI EW 5 11 15 - 8 33.3 spec. 1983 KZ PAV EA 20 58 48 -70 25.9 both 1980 EE PEG EA 21 40 02 + 9 10.9 phot. 1979 LX PER EA 3 13 18 +48 06.7 phot. 1983 AE PHE EW 1 32 33 -49 31.5 both 1970 delta PIC EB 6 10 18 -54 58.0 spec. 1973 UV PSC EB 1 16 54 + 6 48.8 both 1985 XZ PUP EB 8 13 31 -23 57.0 spec. -- TT PYX E 5 59 44 -27 48 7 spec. 1978 RS SGR EA 18 17 36 -34 06.9 phot. 1980 V505 SGR EA 19 53 07 -14 36.5 1985 V525 SGR EB 19 07 14 -30 10.1 spec. 1973 V1647 SGR EB 17 59 14 -36 56.8 spec. 1982 V2509 SGR EB 18 15 51 -35 39.3 spec. 1967 mu SGR EA 18 13 46 -21 04.0 spec. 1938 V393 SCO EA 17 48 48 -35 03.9 apec. -- V760 SCO EA 16 24 49 -34 54.3 spec. 1965 TY TAU EA 4 34 42 +15 16.3 spec. 1985 EN TAU EA 5 56 42 +25 14.9 spec. 1975 HU TAU EA 4 38 16 +20 41.5 spec. 1984 HO TEL EA 19 52 00 -46 52.1 spec. 1980 XY UMA EB 9 09 59 +54 30.1 both 1985 XZ UMA EA 9 31 27 +49 28.4 both 1985 W VOL EW 7 37 43 -69 32.8 spec. -- Stars (Kukarkin et al., 1985), from a catalogue of parameters of eclipsing binaries (Brancewicz and Dworak, 1980) and also from the Cracow Card Index of Minima for Eclipsing Binaries. T. Z. DWORAK Astronomical Commission of the Polish Astronautical Society Cracow, Poland E. OBLAK Observatoire Astronomique de Besancon, France References: Brancewicz, H. K., Dworak, T.Z., 1980, Acta Astr., 30, 501 [BIBCODE 1980AcA....30..501B ] Dworak, T.Z., Oblak, E., 1984, Post. Astronomii, t. XXXII, 187. [BIBCODE 1984PoAst..32..187D ] Kukarkin, B. V., et. al., 1985, GCVS, the Fourth Edition, Moscow.