============================================================================ THE ELECTRONIC VERSION OF THE 74TH SPECIAL NAME-LIST OF VARIABLE STARS. E.V. Kazarovets, N.N. Samus, O.V. Durlevich, S.V. Antipin, M.S. Frolov, N.N. Kireeva, E.N. Pastukhova ================================================================================ The 74th Special Name-list of Variable Stars, A.V. Kazarovets, N.N. Samus, O.V. Durlevich, S.V. Antipin, M.S.,Frolov, N.N. Kireeva, E.N. Pastukhova, IBVS, 1999, No. 4659 ================================================================================ ftp://ftp.sai.msu.su/pub/groups/cluster/gcvs/gcvs/nl74/ http://www.sai.msu.su/groups/cluster/gcvs/gcvs/ gcvs@sai.msu.su INTRODUCTION This Name-list is a rather unusual one . In November, 1996, the General Catalogue of Variable Stars (GCVS) team was contacted by Dr. M. Grenon representing the compilers of the Hipparcos catalogue and suggested to give GCVS names to 5665 variable stars discovered by the Hipparcos mission, so that these stars will appear in the Hipparcos catalogue already along with their final GCVS designations. Within one month, we selected Hipparcos variables satisfying GCVS criteria and designated 3157 objects as GCVS stars (ESA, 1997). However, the preparation of the 74th Name-list, which is the largest Name-list in the history of the GCVS, took considerable time: - We checked identifications of Hipparcos variables with the NSV catalog, revealed a number of missing identifications, and complemented Hipparcos results with information from our files for NSV stars. We also identified Hipparcos variables with our supplementary lists of suspected variables (the basis of the Supplement to the NSV Catalogue, Kazarovets et al. 1998). - We thoroughly reconsidered classification of Hipparcos variable stars according to the GCVS criteria (Kholopov, 1985; Kholopov et al., 1987, 1989; Kazarovets and Samus, 1995). In many cases, we disagreed in classification with the Hipparcos team. In particular, we felt cautious about short (several days) periods found by Hipparcos team for many variable red giants and preferred to classify them as probable red irregulars or semiregulars. On another hand, the Hipparcos results clearly show that the existing GCVS classification system is insufficient. For example, we found difficulties in classifying variable red subgiants, a type of variable stars not clearly recognized before the Hipparcos mission. However, no new types of variable stars are introduced in the present Name-list; the revision of the classification system is a task for future research. - We retrieved SIMBAD identifications for Hipparcos variables, checked many of them (more than 500 mistakes in the SIMBAD data base were revealed in this process), added identifications with the Hubble Space Telescope Guide Star Catalog (GSC). The list of Hipparcos variables was identified with existing catalogues of spectroscopic variables; as a result, several stars were reclassified from pulsating stars to ellipsoidal variables. The extreme case of V1472 Aql, reclassified from a red semiregular variable to a possible eclipser, was described by Samus (1997). Special effort was spended for components of double stars, where much confusion in identifications occurs. For stars in open clusters, we tried to retain numbers in the system of J.-P. Mermilliod's data base (BDA) from several numbers suggested by SIMBAD in some cases. This part of our work was the most time-consuming. Of the 2417 stars from the Hipparcos list of new variable stars not included into the present Name-list, 91 are already contained in the GCVS; the rest of objects do not meet some of the GCVS naming criteria, they appear in the Supplement to the NSV Catalogue (Kazarovets et al., 1998) or are already present in the NSV catalogue (Kholopov, 1982). DESCRIPTION The electronic version of the 74th Name-list consists of a data set, the table of identifications, and a list of remarks. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- readme 90 200 This file 74nl.dat 84 3159 The 74th special Name-list 74nl_ind.txt 29 30345 Cross-Identifications 74nl_rem.txt 324 125 Remarks -------------------------------------------------------------------------------- The main table of the Name-list presents new variable stars arranged in the order of their HIP (Hipparcos catalogue) numbers, which are in the order of right ascensions for the equinox 2000.0. However, the GCVS names within each constellation are introduced in the order of right ascensions for the equinox B1950.0; we retain this equinox until a new GCVS version, with accurate 2000.0 coordinates, is ready. A significant deviation from the format of the previous Name-lists is the absence of two columns with references to the literature; the main source of data is the Hipparcos catalog (ESA, 1997), which also contains finding charts. Byte-by-byte Description of file: 74nl.dat ------------------------------------------------------------------------------ Bytes Format Units Label Explanations ------------------------------------------------------------------------------ 1- 3 I3 --- Constell [1/88]Constellation numeric code 4- 7 I4 --- Number Star number within the constellation 9- 17 A9 --- GCVS Variable star designation 18 A1 --- NoteFlag [*] Remarks - see file 74nl_rem.txt 20- 25 I6 --- Num_HIP HIPPARCOS number 27- 28 I2 h RAh *Hours RA, equinox 1950.0 29- 30 I2 min RAm *Minutes RA, equinox 1950.0 31- 34 F4.1 s RAs *Seconds RA, equinox 1950.0 35 A1 --- DE- *Sign Dec, equinox 1950.0 36- 37 I2 deg DEd *Degrees Dec, equinox 1950.0 38- 39 I2 arcmin DEm *Minutes Dec, equinox 1950.0 40- 41 I2 arcsec DEs *Seconds Dec, equinox 1950.0 43- 44 I2 h RAh Hours RA, equinox 2000.0 45- 46 I2 min RAm Minutes RA, equinox 2000.0 47- 50 F4.1 s RAs Seconds RA, equinox 2000.0 51 A1 --- DE- Sign Dec, equinox 2000.0 52- 53 I2 deg DEd Degrees Dec, equinox 2000.0 54- 55 I2 arcmin DEm Minutes Dec, equinox 2000.0 56- 57 I2 arcsec DEs Seconds Dec, equinox 2000.0 59- 66 A8 --- VarType Type of variability (see http://www.sai.msu.su /groups/cluster/gcvs/gcvs/vartype.txt) 68- 73 F6.3 mag magMax *Magnitude at maximum brightness 75- 80 F6.3 mag magMin *Minimum magnitude or amplitude 82- 83 A2 --- magCode *The photometric system for magnitudes ------------------------------------------------------------------------------- Note on RAh, RAm, RAs, DE-, DEd, DEm, DEs: truncated coordinates, equinox 1950.0. In vast majority of cases, the epoch is also 1950.0 - this may be not so only for stars lacking astrometric solution in the Hipparcos catalogue and having no published proper motions in other sources known to us. Note on magMax, magMin: limits of variability. In the Hipparcos magnitude system, rounded to 0.01; for some stars, the range of variability adopted by us is wider than that given in the Hipparcos catalogue, in accordance with light curves; for several stars, a still wider range follows from observations published elsewhere, such magnitudes are followed by the letter V for visual (or Johnson V) magnitudes or P for photographic magnitudes. The table of identifications (with the order of stars coinciding with that in the main table) presents, along with GCVS names and Hipparcos numbers, designations from a number of important astronomical catalogues (Bayer designations and Flemsteed numbers; Bright Star Catalogue numbers, BS = HR; Bonner, Cordoba, and Cape Durchmusterung numbers; SAO, PPM, GSC numbers; IRC, CRL, and IRAS designations of infrared surveys; designations from catalogues of double stars, nearby stars, large-proper-motion stars, carbon stars, zirconium stars; preliminary designations of suspected variable stars, their NSV Catalogue and CSV numbers, etc.). We would like to warn the users that, despite our considerable effort to check identifications, this table is substantially based upon the SIMBAD data base in its contents and completeness. See also some catalogs abbreviations http://www.sai.msu.su/groups/cluster/gcvs/gcvs/abbrev.txt Byte-by-byte Description of file: 74nl_ind.txt --------------------------------------------------------------------------- Bytes Format Units Label Explanations --------------------------------------------------------------------------- 1- 4 A4 --- Cat Abbreviated name of catalog or list 6- 21 A16 --- Seq Star number or name in the respective catalog and component designations 23- 28 A6 --- HIP Number in the Hipparcos catalogue --------------------------------------------------------------------------- Byte-by-byte Description of file: 74nl_rem.txt --------------------------------------------------------------------------- Bytes Format Units Label Explanations --------------------------------------------------------------------------- 1- 9 I9 --- GCVS Variable star designation 11- 16 A6 --- HIP Designation in the Hipparcos catalogue 18-324 A307 --- Rem Remarks --------------------------------------------------------------------------- We gratefully acknowledge the use of the SIMBAD data base and of the BDA data base for open clusters during preparation of this Name-list. This study was partially supported by the ESA, by the Russian Foundation of Basic Research (grant 97-02-16739), by the Russian Federal Scientific Programme "Astronomy", and by the Russian Council for Support of Leading Scientific Schools (grant 96-15-96656). REFERENCES ESA, The Hipparcos and Tycho Catalogues, 1997, SP-1200 Kazarovets, E.V., Samus, N.N., IBVS, 1995, No. 4140 Kazarovets, E.V., Samus, N.N., Durlevich, O.V., IBVS, 1998, No. 4655 Kholopov, P.N. (ed.), New Catalogue of Suspected Variable Stars, 1982, Moscow: Nauka Kholopov, P.N. (ed.), General Catalogue of Variable Stars, Vol. I, 1985, Moscow: Nauka Kholopov, P.N., Samus, N.N., Kazarovets, E.V., Kireeva, N.N., IBVS, 1987, No. 3058 Kholopov, P.N., Samus, N.N., Kazarovets, E.V., Frolov, M.S., Kireeva, N.N., IBVS, 1989, No. 3323 Samus, N.N., IBVS, 1997, No. 4501 ======================================================================= (End) N.N. Samus, O.V. Durlevich [Moscow Inst. Astron.] 19-Jan-1999