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GCVSEGVARS - General Catalog of Variable Stars (GCVS4.2): Extragalactic Variables |
HEASARC Archive |
The present improved electronic version of the GCVS 4th Edition, Volumes I-V, combined with the Name-Lists of Variable Stars Nos. 67 - 77, is also available from the Sternberg Institute via anonymous ftp to ftp://ftp.sai.msu.su/pub/groups/cluster/gcvs/gcvs/ and more information is available via the Web at http://www.sai.msu.su/groups/cluster/gcvs/gcvs/ .
General Catalogue of Variable Stars, 4th ed., vol. V. Extragalactic Variable Stars Artiukhina N.M., Durlevich O.V., Frolov M.S., Goranskij V.P., Gorynya N.A., Karitskaya E.A., Kazarovets E.V., Kholopov P.N., Kireeva N.N., Kurochkin N.E., Lipunova N.A., Medvedeva G.I., Pastukhova E.N., Samus N.N., Tsvetkova T.M. <"Kosmosinform", Moscow, (1995)>
Galaxy_Code
This is a numeric code for the galaxy name, ranging from
89 for the LMC to 123 for the WLM Galaxy (codes 1-88 in the GCVS are
reserved for constellation names for galactic variable stars).
The galaxy codes are as follows:
Gal. Code Galaxy Gal. Code Galaxy Gal. Code Galaxy 89 LMC 90 SMC 91 M 31 92 M 33 93 NGC 147 94 NGC 185 95 NGC 205 96 NGC 300 97 Scl Galaxy 98 IC 1613 99 ESO 356- 4 100 NGC 1313 101 NGC 1466 102 Ret Galaxy 103 PGC 19441 104 NGC 2366 105 NGC 2403 106 Holmberg II 107 NGC 3031 108 Sextans B 109 Leo A 110 NGC 3109 111 Leo I 112 Sextans A 113 NGC 4365 114 NGC 4472 115 NGC 4486 116 NGC 5128 117 NGC 5457 118 UGC 9749 119 UGC 10822 120 NGC 6822 121 IC 5152 122 UGC 12613 123 WLM Galaxy
Galaxy_Star_Num
The Variable Star Number within the specified galaxy.
Name
The GCVS Extragalactic Variable Star designation.
Remark_Flag
This flag is set to 'Y' if there is a remark on this star in
the file: ftp://cdsarc.u-strasbg.fr/pub/cats/II/250/evs_rem.dat
RA
The Right Ascension of the star in the specified equinox. This was given
to no better than a precision of 0.1 seconds of time in the originating table,
and in 1950 equatorial co-ordinates.
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 1950 equatorial
co-ordinates.
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 arcsecond; 'B' means declinations accurate to 0.1 arcminutes; 'C' means declinations accurate to one arcminute; 'D' means for V474 in the Sculptor system (V474 SclG), the listed coordinates refer to the galaxy's center since the coordinates of the star itself are unknown.
Variability_Type
The type of variability according to the GCVS variability
classification scheme, with the addition of the new "BLBOO" type, named after
the prototype star BL Boo = NGC 5466 V19 referring to the so-called "anomalous
Cepheids", i.e. stars with periods characteristic of comparatively long-period
RRAB variables, but considerably brighter in luminosity. There are also
suspected variables designated by the symbol "var:".
Max_Mag
The apparent magnitude at maximum brightness.
Max_Mag_Flag
This flag is set to ':' if the maximum magnitude is
considered uncertain.
Limit_Min_Mag
This is a limit flag for the minimum magnitude: '>'
indicates that the min_mag value given is a bright limit, ie., the actual
minimum magnitude is fainter than this value, while '(' means that the
min_mag value given is an amplitude rather than an observed magnitude.
Min_Mag
This parameter is either the apparent magnitude at minimum
brightness, or, if the value of limit_min_mag is '(', the amplitude of
variation.
Min_Mag_Flag
This flag is set to ':' if the min_mag value is
considered uncertain.
Mag_System
The designation of the photometric band in which the magnitudes
are given: P means photographic magnitudes, V means visual or photovisual
magnitudes as well as Johnson V system magnitudes. In the latter case, they
are usually distinguishable from visual magnitudes by the number of digits
after the decimal point (as a rule, V system magnitudes are based upon
photoelectric or CCD photometry). The letters U, B, R, I, J, H, K, L, M, N,
O, Q mean, as a rule, magnitudes expressed in the corresponding systems of
broad-band photometry.
Epoch
The epoch of maximum or minimum, expressed as the Julian Date. For
eclipsing and ellipsoidal variables, RV Tau and RS CVn stars, the catalog
gives the epoch of minimum light, while for the rest of variables, it gives
the epoch of maximum light. For novae (variability_type N) and supernovae
(variability_type SN), the epoch is completed by the year of the outburst
(nova_year parameter).
Epoch_Flag
This flag is set to ':' if the epoch is considered uncertain.
Limit_Period
A code qualifying the period, that is set to '(' if the
period is the mean cycle time of a U Gem star or recurrent nova.
Period
The period of the variable star, in days, or, if limit_period =
'(', the mean cycle time of a U Gem star or recurrent nova. This parameter
is given with a range of precisions up to a possible maximum of 1.E-08 days
in the original table.
Period_Flag
This flag is set to ':' if the period is considered uncertain.
Rise_Eclipse_Time
This parameter contains either the rise time (M-m, the
duration of light increase from minimum to maximum) for intrinsic variables,
or the duration of the eclipse (D) for eclipsing or Algol-type binaries.
The value is given as a percentage of the period of the star.
Rise_Eclipse_Time_Flag
This flag is set to ':' if the rise time or eclipse
duration given in the rise_eclipse_time parameter is considered uncertain.
Eclipse_Var_Note
This is a note used for eclipsing variables that is set
to '0' when the duration of the light constancy phase at minimum light (d)
is equal to zero.
Spect_Type
The spectral type of the variable star. If there exist several
spectral type determinations for a star, the more recent ones have been
preferred, taking into account the reliability of each determination.
The symbols "d" (dwarfs) and "g" (giants) have been converted into luminosity
classes V and III, respectively. If a star showed spectral features typical
of novae during or after the outburst, a symbol 'NOVA' is given in this
parameter. If the spectrum showed features characteristic of U Gem variables,
this parameter contains the symbol 'UG'. A continuous spectrum is designated
as 'cont', the symbol 'e' means an emission-line spectrum, lower-case letters
'ea', 'eb' in this field stand for 'e alpha', 'e beta'. For RR Lyrae stars,
spectral types derived from hydrogen lines are given. A plus sign (+) between
two spectral type values means that the spectra of two components of a
spectroscopic binary are observed. Two spectral type values separated with
a minus sign (-) give the range of spectral type variations in the process of
brightness changes.
Ref_Star
This is a reference code referring to a major study of the star,
the key to which can be found in the file:
ftp://cdsarc.u-strasbg.fr/pub/cats/II/250/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/II/250/refs.dat
Alt_Name_1
An alternative designation for the variable star that is used
in the reference whose code is given in the ref_star parameter.
Alt_Name_2
An alternative designation for the variable star that is used
in the reference whose code is given in the ref_chart parameter.
GCVS_Nsv_Name
The alternative GCVS or NSV designation for the variable star.
Non_Member
This is a flag indicating the nonmembership status of the variable
star in the Galaxy in whose field the star lies. The symbols 'N' or 'N:'
indicate nonmembership and possible nonmembership, respectively, in the galaxy
in question. For the stars that are in the main GCVS (vols. I-III) or the
GCVS Catalog of Newly Suspected Variables (NSV) and which are not members
of the corresponding galaxy, the present catalog typicallu gives only the
Extragalactic Variable running number, the coordinates, the symbol 'N' in this
field, and the GCVS or NSV name.
Nova_Year
The year of outburst of the star, if a nova.
Nova_Year_Flag
This flag is set to ':' if the outburst year of the nova is
considered uncertain.
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).