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GCVSNSVARS - General Catalog of Variable Stars, March 2012 Version: Suspected Variable Stars |
HEASARC Archive |
The data contained in the present catalog include positions, magnitudes, variability types, references to the literature, and spectra.
General Catalog of Variable Stars (GCVS database, Version 2012Mar)
Samus N.N., Durlevich O.V., et al.
<Institute of Astronomy of Russian Academy of Sciences and Sternberg
State Astronomical Institute of the Moscow State University >
New Catalogue of Suspected Variable Stars,
Kukarkin B.V., Kholopov P.N., Artiukhina N.M., Fedorovich V.P.,
Frolov M.S., Goranskij V.P., Gorynya N.A., Karitskaya E.A.,
Kireeva N.N., Kukarkina N.P., Kurochkin N.E., Medvedeva G.I.,
Perova N.B., Ponomareva G.A., Samus N.N., Shugarov S.Yu.
<Moscow: Nauka Publishing House (1982)>
New Catalogue of Suspected Variable Stars. Supplement - Version 1.0
Kazarovets E.V., Durlevich O.V., Samus N.N.
<Institute of Astronomy of Russian Academy of Sciences and
Sternberg Astronomical Institute (1998)>
=1998IBVS.4655....1K
Name
The GCVS Suspected Variable Star prefix NSV (for New Suspected
Variable) together with a running number (from 1 to 14811 for stars in the
original 1982 NSV Catalog, and from 15001 to 26206 for stars in the 1998
Supplement to the NSV). Leading zeroes have been removed from the running
number. One entry (NSV 10360) has a letter suffix of A, and thus, to be
completely accurate, should be referred to as NSV 10360A, according to the
CDS documentation.
NSV
The NSV Catalog running number (from 1 to 14811 for stars in the
original 1982 NSV Catalog, and from 15001 to 26206 for stars in the 1998
Supplement to the NSV). Leading zeroes have been removed from the running
number, notice.
NSV_Suffix
The NSV Catalog letter suffix, used only for one entry (NSV
10360) which has a letter suffix of A, and thus should be referred to as
NSV 10360A, according to the CDS documentation.
Variability_Flag
This is a flag that is set to the value of '-' if
a star's variability seems doubtful or erroneous according to the
compilers of the NSV Catalog.
Note_Flag
This is a flag that is set to 'Y' if there are remarks
on the star in the file ftp://cdsarc.u-strasbg.fr/pub/cats/B/gcvs/nsv_rem.dat
The remarks contain information covering situations such as, e.g.:
1. The discoverer of the light variability is not the author of the
paper cited in the variability reference, or is one of several
authors of the paper cited. In these cases, discoverers' names are
given in original transcriptions of the remarks.
2. The most important additional information about a star, although
the NSV Supplement compilers did not intend to present complete
bibliographies for any cataloged stars.
3. Remarks for visual binaries giving visual magnitudes for the
individual components A and B, angular separations, and position
angles for faint components (or semi-major axis of a relative orbit
and period of orbital motion). Then, data for other components are
given where applicable. (Combined magnitudes are generally reported
in the main database table).
RA
The Right Ascension of the star in the specified equinox. This was given
to a precision of 0.1 seconds of time in the originating table, and in
both B1950 and J2000 equatorial coordinates.
Dec
The Declination of the star in the specified equinox. This was given
to a precision of 1 arcsecond in the originating table, and in both J2000
and B1950 equatorial coordinates.
LII
The Galactic Longitude of the star.
BII
The Galactic Latitude of the star.
Position_Flag
This is a code flag describing the positional accuracy,
as follows:
'A' means right ascensions accurate to one second of time and
declinations accurate to one-tenth of an arcminute
'B' means declinations accurate to 1 arcminute
Variability_Type
The type of variability according to the GCVS (4th
Edition) variability classification scheme, with the addition of six
new types (ZZO, AM, R, BE, LBV, BLBOO) that were introduced in the Name-Lists
67-72 and in the GCVS vol. V. Descriptions of the 6 new types only are given
below, while the entire classification scheme is described in the file
ftp://cdsarc.u-strasbg.fr/pub/cats/B/gcvs/vartype.txt. The new types are:
ZZO ZZ Cet type variables of the DO spectral type showing HeII and
and CIV absorption lines in their spectra.
AM AM Her type variables; close binary systems consisting of a
dK-dM type dwarf and of a compact object with strong magnetic
field, characterized by variable linear and circular polarization
of light. The total range of light variations may reach 4-5 mag V.
R Close binary systems characterized by the presence of strong
reflection (re-radiation) of the light of the hot star
illuminating the surface of the cooler companion. Light curves
are sinusoidal with the period equal to Porb, maximum brightness
coinciding with the passage of the hot star in front of the
companion. The eclipse may be absent. The range of light
variation is about 0.5-1.0 mag V (KV Vel).
BE It becomes more and more clear that, although the majority of Be
stars are photometrically variable, not all of them could be
properly called GCAS variables. Quite a number of them show
small-scale variations not necessarily related to shell events; in
some cases the variations are quasi-periodic. By now we are not
able to present an elaborated system of classification for Be
variables, but we adopt a decision that in the cases when a Be
variable cannot be readily described as a GCAS star we give simply
BE for the type of variability.
LBV For comparatively long-period pulsating B stars (periods exceeding
one day), we introduce a provisional type LBV.
BLBOO The so-called "anomalous Cepheids", i.e. stars with periods
characteristic of comparatively long-period RRAB variables, but
considerably brighter by luminosity (BL Boo = NGC 5466 V19).
Limit_Max_Mag
This is a limit flag for the maximum magnitude: '<'
indicates that the max_mag value given is a numerical upper limit, i.e., the
actual maximum magnitude may be brighter than this value, while '>' means
that the max_mag value given is a numerical lower limit, i.e., the actual
maximum magnitude may be fainter than this value.
Max_Mag
The apparent magnitude at maximum brightness. Magnitudes are
reported to hundredths if the observations are photoelectric or CCD, to
tenths or whole magnitudes if they are not. If only an amplitude has been
measured photoelectrically, then the maximum magnitude is generally
given to tenths only and the minimum is reported to hundredths.
Max_Mag_Flag
This flag is set to ':' if the maximum magnitude is
considered uncertain.
Limit_Min_Mag
This field may contain flag(s) indicating limit and/or
amplitude for the min_mag value.
If the field contains '(', that indicates that the quoted min_mag value is an amplitude relative to the value of the max_mag parameter, rather than the actual minimum magnitude, and the limit, if present, applies to this amplitude.
If the value is '>', then the min_mag value given is a bright limit, i.e., the actual minimum magnitude may be fainter than this value, while if the value is '<', then the min_mag value given is a faint limit, i.e., the actual minimum magnitude may be brighter than this value.
Min_Mag
The minimum apparent magnitude, or the amplitude of variability.
If the value of limit_min_mag contains '(', this indicates that the min_mag
value given is an amplitude rather than an observed minimum magnitude.
Magnitudes are reported to hundredths if the observations are
photoelectric or CCD, to tenths or whole magnitudes if they are not.
If only an amplitude has been measured photoelectrically, then the maximum
magnitude is generally given to tenths only and the minimum is reported to
hundredths. If the value of min_mag_flag is 'st', then the quoted value
of min_mag is an amplitude in steps rather than magnitudes, and the original
references should be consulted for further information.
Min_Mag_Flag
This flag is set to ':' if the min_mag value is considered uncertain, and is
set to 'st' if the quoted value of min_mag is an amplitude in steps
rather than magnitudes, and the original references should be consulted for
further information. In 3 cases (NSV 25926, NSV 25927 and NSV 25981) the
value is set to 'A' (the HEASARC changed the original '*' since an asterisk
is used as a wild card character in its system): the significance of this flag
value is not specified in the original CDS documentation.
Min_Mag_System
A code for the photometric system in which the min_mag
value is reported (given only if this is different from the photometric system
in which the max_mag value is reported). The main codes are V (visual,
photovisual, or Johnson V), B (Johnson B) and p (photographic magnitudes).
The designations u, v, b, y refer to the Stroemgren system. The symbols Ic
and Rc mean magnitudes in the Cousins I, R system, g designates magnitudes
in the system of Thuan and Gunn, T stands for broad-band Tycho magnitudes
formed from B and V measurements, while r are red magnitudes not tied to
a particular system. A value of 'w' for this parameter means that the quoted
magnitude is for a white-light measurement. Several stars from the 68th Name
List have values of '1.' for this parameter to designate the 1.04 micron band
of the system introduced by G.W. Lockwood.
Mag_System
A code for the photometric system in which the max_mag and
min_mag value are reported (if the value of min_mag_system is blank), or
for the photometric system in which the max_mag value only is reported
(if the value of min_mag_system is non-blank). The main codes are V (visual,
photovisual, or Johnson V), B (Johnson B) and p (photographic magnitudes).
The designations u, v, b, y refer to the Stroemgren system. The symbols Ic
and Rc mean magnitudes in the Cousins I, R system, g designates magnitudes
in the system of Thuan and Gunn, T stands for broad-band Tycho magnitudes
formed from B and V measurements, while r are red magnitudes not tied to
a particular system. A value of 'w' for this parameter means that the quoted
magnitude is for a white-light measurement. Several stars from the 68th Name
List have values of '1.' for this parameter to designate the 1.04 micron band
of the system introduced by G.W. Lockwood.
Ref_Star
This is a reference code referring to a study of the star, the key
to which can be found in the file
ftp://cdsarc.u-strasbg.fr/pub/cats/B/gcvs/refs.dat
Ref_Chart
This is a reference code referring to a study that contains a
chart or photograph of the star field, the key to which can be found in the
file ftp://cdsarc.u-strasbg.fr/pub/cats/B/gcvs/refs.dat
Alt_Name
The identification of the suspected variable in the paper whose
code reference is given in the ref_star parameter. DM numbers are given
without a prefix, the standard naming convention of "The Henry Draper
Catalogue" being used (BD for declination zones +89 to -22, CD for zones -23
to -51, and CP for zones -52 to -89). Some identifications are given by
coordinate designations, a 6-digit number consisting of hours, minutes, and
seconds (or tenths of a minute) of time and degrees of declination with sign
included. A value of 'Y' signifies that a designation is given in the remarks
to the published catalog. This parameter is not populated for the stars in
the NSV Supplement (entries with values of the nsv parameter of 15001 or
greater.
Spect_Type
The spectral type and luminosity class of the suspected variable
star, if known. Spectral types from the HD Catalog are generally given in
parentheses. Also, the following (non-standard) symbols may be used:
AF for A-F type stars
FG for F-G type stars
KM for K-M type stars
Alt_Var_Name
The alternative name of the suspected variable star either
as given in the main Catalog of Galactic Variable Stars (the HEASARC GCVS
table, created from the CDS table B/gcvs/gcvs_cat.dat), a Name-List number,
if it starts with the 2-digit number 67-77 and is followed by the 4-digit
number of the star in the corresponding Name List, or as given in the GCVS
Catalog of Extragalactic Variable Stars (the HEASARC GCVSEGVARS table, created
from the CDS table B/gcvs/evs_cat.dat). In the last case, the name may be
followed by an asterisk: this indicates that there are remarks about this
star in GCVS Volume V. Notice that the HEASARC removed a number of entries
(which are listed in the file
http://heasarc.gsfc.nasa.gov/FTP/heasarc/dbase/misc_files/gcvsnsvars_deleted.entries)
that were present in the CDS table B/gcvs/nsv_cat.dat but had no
coordinates given, indicating that the status of these suspected variable stars
had changed. The HEASARC retained other entries that have non-blank
values of the alt_var_name parameter but that have valid positional coordinates
and other data.
Class
The HEASARC Browse object classification, based on the spectral type
parameter (spect_type), if there is information in this field, else
based on the variability type parameter (variability_type).