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VizieR

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II/250/gcvs_cat Combined General Catalogue of Variable Stars (Samus+ 2004)
The GCVS4.2 Catalog (Vol. I-III) (38624 rows)
  GCVS==alf Lyr
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ColumnValue  Explain   (UCD)
_RAJ200018 36 56.300 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000+38 47 01.00 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195018 35 15.477 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950+38 44 23.79 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon067.448081 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat+19.237339 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
18630recno 18630  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

VarNum529001  Numeric designation, made from constellation and star names (codes in file "constel.txt") (meta.id)
m_VarNum   Component identification (Note 1)   (meta.code.multip)
GCVSalf Lyr  (i) Variable star designation (Note G1)   (meta.id)
n_GCVS*   [*] indicates a remark in "gcvs_rem.dat" file , x indicates the existence of cross-identifications (meta.note)
u_DE1950    [:*] position accuracy flags (Note G2)   (meta.code.error;pos.eq.dec)
RAJ200018 36 56.3 "h:m:s" (i) Hours RA, equinox J2000.0 (Note 2)   (pos.eq.ra;meta.main)
DEJ2000+38 47 01 "d:m:s" (i) Degrees Dec, equinox J2000.0 (Note 2)   (pos.eq.dec;meta.main)
u_DEJ2000    [:*] position accuracy flags (Note G2)   (meta.code.error;pos.eq.dec)
n_Pos    [*] Position computed from B1950 (Note 3)   (meta.note)
VarTypeDSCTC  Type of variability (see file "vartype.txt") (meta.code;src.var)
l_magMax    [<>(] Limit or amplitude symbol on magMax (Note G3)   (meta.code.error)
magMax-0.020 mag Magnitude at maximum brightness (phot.mag)
u_magMax   Uncertainty flag (:) on magMax (meta.code.error)
l_magMin    [<(] Limit or amplitude symbol on magMin (Note G3)   (meta.code.error)
magMin 0.070 mag Minimum magnitude or amplitude (phot.mag)
u_magMin   Uncertainty flag (:) on magMin (meta.code.error)
n_magMin   Alternative photometric system for magMin (Note G4)   (meta.note)
magCodeV  The photometric system for magnitudes (Note G4)   (meta.code;instr.filter)
Epoch  d Epoch for maximum light, Julian days (Note G5)   (time.epoch)
u_Epoch    [:±] Uncertainty flag on Epoch (Note 4)   (meta.code.error;time.epoch)
Year   Year of outburst for nova or supernova (time.epoch)
u_Year    [:] Uncertainty flag on Year of outburst (meta.code.error)
l_Period    [<>(] Code for upper or lower limits (Note 5)   (meta.code.error;time.period)
Period 0.1900000000 d Period of the variable star (time.period)
u_Period    [*/N)2: ] Uncertainties on Period (Note 6)   (meta.code.error;time.period)
M-m/D  % Rising time or duration of eclipse (Note G6)   (time.interval)
u_M-m/D   Uncertainty flag (:) on M-m/D (meta.code.error)
n_M-m/D    [*] Note for eclipsing variable (Note G6)   (meta.note)
SpTypeA0V  MK Spectral type (src.spType)
Ref104126  Reference to a study of the star (Note G7)   (meta.bib)
Ref2BD  Reference to a chart or photograph (Note G7)   (meta.bib)
f_GCVS    [=N+] "N" if the star does not exist (Note 7)   (meta.code)
VarName   Alternative name of the variable (Note G8)   (meta.id)

AFOEV   Check the existence of a light curve at AFOEV (meta.ref.url)
SimbadSimbad  ask the Simbad data-base about this object
  
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