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THE 75th NAME-LIST OF VARIABLE STARS.

E.V. Kazarovets *, N.N. Samus *, O.V. Durlevich **.

* Institute of Astronomy, Russian Academy of Sciences, 48,
Pyatnitskaya Str., Moscow 109017, Russia [samus@sai.msu.ru,elena_k@sai.msu.ru]
** Sternberg Astronomical Institute, University of Moscow, 13,
University Ave., Moscow 119899, Russia [gcvs@sai.msu.ru].

IBVS 4870, 31 March 2000
___________________________________________________________________________

We present the next regular Name-List of variable stars containing
information on 916 variable stars recently designated in the system of
the General Catalogue of Variable Stars.

Key: variable stars; catalogues

The present 75th Name-List of Variable Stars, compiled basically in the
manner first introduced in the 67th Name-List (IBVS No. 2681, 1985),
contains all data necessary for identification of 916 new variables
finally designated in 1999. The total number of designated variable
stars, not counting designated non-existing stars or stars subsequently
identified with earlier-designated variables, has now reached 35985.

The 75th Name-List consists of two tables. Table 1 contains the list of
new variables arranged in the order of their right ascensions. It gives
the ordinal number and the designation of each variable; its equatorial
coordinates for the equinox 1950.0 (we present right ascensions to 0.1
sec and declinations to 1". The coordinates were found in the
literature, taken from positional catalogues, including USNO A1.0/A2.0
and GSC, or determined by the authors); the range of variability
(sometimes the column "Min" gives, in parentheses, the amplitude of
light variation; the symbol "(" means that the star, in minimum light,
becomes fainter, than the magnitude indicated); and the system of
magnitudes used ("P" are photographic magnitudes the symbols "Rc", "Ic"
designate magnitudes in Cousins's RI system; the symbols "b", "v" mean
Stroemgren's b, v magnitudes; "Hp" stands for magnitudes in the system
of the Hipparcos catalog; "L'" are infrared magnitudes at 3.8 mkm; the
rest of designations are standard Johnson UBVRIJKLM magnitudes); the
type of variability according to the classification system described in
the forewords to the first three volumes of the 4th GCVS edition (with
the additions introduced in the 68th Name-List, IBVS No. 3058, 1987, in
the 69th Name-List, IBVS No.3323, 1989, and in the 72nd Name-List, IBVS
No.4140, and two additions described below; see also the description of
variability types and distribution of stars over variability types at
http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/vartype.txt; two
references to the list of papers which follows Table 2 (the first
reference is to the investigation of the star, the second one indicates
the paper containing a finding chart, or the corresponding
Durchmusterung - BD, CoD, or CPD - containing the variable, or the
Hubble Space Telescope Guide Star Catalog - GSC - or the USNO A1.0/A2.0
catalog - USNO - if the star can be found using one of them).

In a small number of cases, the value of the variability amplitude
(column "Min", in parentheses) could not be expressed in the same system
of magnitudes as the star's brightness; in such cases we indicate the
photometric band for the amplitude separately. For KL Dra, V1010 Her,
and V370 Peg, the magnitudes in maximum brightness are from unfiltered
CCD observations.

In the present Name-List, we have introduced two new variability types
for pulsating variables.

GDOR - gamma Doradus stars. Early type F dwarfs showing (multiple)
periods from several tenths of a day to slightly in excess of one day.
Amplitudes usually do not exceed 0.1 mag. Presumably low degree g-mode
non-radial pulsators. Prototype: gamma Dor.

RPHS. Very rapidly pulsating hot (subdwarf B) stars. Typical periods
are hundreds of seconds, amplitudes are within several hundredths of a
magnitude. Prototype: V361 Hya = EC 14026-2647.

Suggestions of a better designation for the new type are welcome.

A version of Table 1 given in the electronic supplement to this paper
(file 4870-t1.txt) contains also coordinates for the equinox 2000.0. In
the electronic table, no spaces are left between hour and minutes,
minutes and seconds of right ascension or between degrees and minutes,
minutes and seconds of declination.

Table 2 contains the list of variables arranged in the order of their
variable star names within constellations. After the designation of a
variable, its ordinal number from Table 1 is given, as well as
identifications with several major catalogues and identifications
necessary to find this star in the papers referred to in Table 1 or in
the papers with the first (or independent) announcement of the discovery
of its variability, referred to (in some cases) in square brackets after
the corresponding identification in Table 2. In variance with our
earlier practice, we did not include names of discoverers different from
the name of the author(s) of the paper referred to. After the
identifications, some minimal remarks are given if necessary. Table 2
and the list of references are also presented in the form of ASCII files
in the electronic supplement to this paper (files 4870-t2.txt and 4870-t3.txt).
The abbreviated names of the catalogues in Table 2
generally follow conventions of the GCVS or of the SIMBAD data base; in
its electronic version, "Name" stands for non-standard names or
abbreviations, mainly from discovery announcements, and "Rmrk", for
remarks.

The small table below contains corrected coordinates for two stars from
the Name-List No.73 (IBVS No. 4471, 1997).

73283 FI UMa 11 09 50.6 +55 09 59
73684 V389 Cep 21 27 13.0 +55 45 14

Note that corrected coordinates for many GCVS variable stars and NSV
catalog suspected variables can be found at our web site
http://www.sai.msu.su/groups/cluster/gcvs/gcvs/
so that we recommend variable star researchers to retrieve updated
versions of our catalogs from time to time.

Thanks are due to M.S. Frolov and S.V. Antipin for their help during
the preparation of the present Name-List and to all members of the GCVS
team who prepared information for the variable star data base. We would
like to thank many scientists who immediately responsed to our requests
to provide missing data or correct erroneous data necessary for this
Name-List. This study was supported in part by Russian Foundation for
Basic Research through grant 99-02-16333, by the Russian Federal
Scientific and Technological Programme "Astronomy", and by the Support
Programme for Leading Scientific Schools of Russia.
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March 2000.