Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sai.msu.su/gcvs/gcvs/nl74/readme Дата изменения: Tue Jan 19 18:23:14 1999 Дата индексирования: Sat Dec 22 06:31:12 2007 Кодировка: Поисковые слова: virgo cluster

============================================================================
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

Sternberg State Astronomical Institute of the Moscow State University>
================================================================================
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