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J/MNRAS/274/1194/table1 Optical Identifications of ROSAT EUV Sources (Mason+ 1995)
WFC optical identification programme ID summary (209 rows)
  recno=12
Post annotation about this record
ColumnValue  Explain   (UCD)
_RAJ200002 39 48.2300 "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+50 03 46.400 "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)
_RAB195002 36 23.8927 "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+49 50 53.694 "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)
_Glon140.1565142 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 -9.1496620 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)
12recno 12  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

Name2RE J023949+500400  Source name (meta.id)
l_S1   Limit flag on S1 (meta.code.error)
S1 27.4 ct/ks WFC survey filter S1 (60-140A) counts (phot.count;em.X-ray)
l_S2   Limit flag on S2 (meta.code.error)
S2 41.3 ct/ks WFC survey filter S2 (110-200A) counts (phot.count;em.X-ray)
NH 17.8 10+20cm-2 Galactic Hydrogen column density (phys.columnDensity)
RAJ200002 39 48.23 "h:m:s" (i) Right ascension J2000 (pos.eq.ra;meta.main)
DEJ2000+50 03 46.4 "d:m:s" (i) Declination J2000 (pos.eq.dec;meta.main)
n_DEJ2000    [g:] A 'g' indicates that the data are from the Hubble Space Telescope Guide Star Catalog (meta.note)
Vmag16.00 mag V magnitude of the optical counterpart (phot.mag;em.opt.V)
Vmag2  mag Upper limit of Vmag when n_Vmag2='-' (phot.mag;em.opt.V)
u_Vmag:  Uncertainty flag on Vmag (meta.code.error)
n_Vmag(S)  Note on Vmag (Note 1)   (meta.note)
B-V-0.2 mag B-V color index of the optical counterpart (phot.color;em.opt.B;em.opt.V)
SpTypeDA  Spectral type of the optical counterpart (src.spType)
l_alpha   Limit flag on alpha (meta.code.error;pos.eq.ra)
alpha-1.55   Source apparent EUV to optical flux ratio (phot.flux;arith.ratio)
ClassWD  Identification class (Note 2)   (src.class)
EWCa  0.1nm Equivalent width of the Ca H 3933A chromospheric emission line (for stars only) (spect.line.eqWidth)
n_EWCa    [u-] Note on EWCa (Note 3)   (meta.note)
EWHa  0.1nm Equivalent width of the Halpha line (for stars only) (spect.line.eqWidth)
n_EWHa    [?u-] Note on EWHa (Note 3)   (meta.note)
FWHb 3.2 10+3km/s Full width at half maximum of the Hbeta line (spect.line.width)
EWHb12.0 0.1nm Equivalent width of the Hbeta line (spect.line.eqWidth)
u_EWHb   Uncertainty flag on EWHb (meta.code.error)
X    [y] y: there is an X-ray telescope position available for the source (meta.note)
Note    [+] +: additional information in appena file (meta.note)
Com   Comments (meta.note)
  
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