J/MNRAS/274/1194 J/MNRAS/274/1194 Optical Identifications of ROSAT EUV Sources K O Mason B J M Hassall G E Bromage D A H Buckley T Naylor D O'Donoghue M G Watson D Bertram G Branduardi-Raymont P A Charles B Cooke K H Elliott M R S Hawkins S T Hodgkin S J Jewell C M Jomaron K Sekiguchi B J Kellett A Lawrence I McHardy J P D Mittaz C D Pike T J Ponman J Schmitt W Voges W Wargau D Wonnacott Mon. Not. R. Astron. Soc. 274 1194 1995 1995MNRAS.274.1194M J/MNRAS/260/77 : ROSAT Wide Field Camera EUV Bright Sources (Pounds+ 1993) J/MNRAS/274/1165 : The 2RE Source Catalogue (Pye+ 1995) Pye J.P. et al., =1995MNRAS.274.1165P Schwartz R.D. et al. =1995PASP..107..667S X-ray sources binaries: general catalogs galaxies: active novae, cataclysmic variables stars: activity white dwarfs Optical identifications for 195 EUV sources located in the ROSAT Wide Field Camera all-Sky survey are presented. We list 69 previous unknown EUV-emitting white dwarfs, 114 active stars, 7 new magnetic cataclysmic variables and 5 active galaxies. Several of the white dwarfs have resolved M-type companions, while five are unresolved white dwarf/M-star pairs. Finding charts are given for the optical counterparts.

ROSAT

Name Source name --- l_S1 Limit flag on S1 --- S1 WFC survey filter S1 (60-140A) counts 10-3ct/s l_S2 Limit flag on S2 --- S2 WFC survey filter S2 (110-200A) counts 10-3ct/s NH Hydrogen column density --- RAh Right ascension J2000 h RAm Right ascension J2000 min RAs Right ascension J2000 s DE- Declination sign --- DEd Declination J2000 deg DEm Declination J2000 arcmin DEs Declination J2000 arcsec n_DE A 'g' indicates that the data are from the Hubble Space Telescope Guide Star Catalog --- Vmag V magnitude of the optical counterpart mag n_Vmag2 '-' when interval --- Vmag2 Upper limit of Vmag when n_Vmag2='-' mag u_Vmag Uncertainty flag on Vmag --- n_Vmag Note on Vmag number=1 P: CCD or photoelectric photometry (Buckley, private communication; Schwartz et al. 1995) G: The HST Guide Star Catalog (v.1.1) cat: catalogued magnitudes (see Pye et al., 1995) E: POSS E digitized plate material J: SERC J digitized plate material S: uncorrected slit magnitudes taken from calibrated spectra A 'c' appended to the J and E codes indicates that accurate external zero-points were not been obtained by comparing the magnitudes of stars within 3arcmin of the EUV source that appear in the HST Guide Star Catalog (v.1.1) with the uncorrected values measured for those stars from the Schmidt-telescope Sky Survey Plates. If there is more than one counterpart, there are separate entries for each star when these are available. --- B-V B-V color index of the optical counterpart mag SpType Spectral type of the optical counterpart --- l_alpha Limit flag on alpha --- alpha Source apparent EUV to optical flux ratio --- Class Identification class number=2 Star: all active stars WD: white dwarf CV: cataclysmic variable AGN: active galaxy --- EWCa Equivalent width of the Ca H 3933A chromospheric emission line (for stars only) 0.1nm n_EWCa Note on EWCa number=3 u: the line was covered but no measurable emission component was detected. Significant chromospheric emission may still be present, particularly when this refers to Halpha (e.g. the Halpha photospheric absorption line may be 'filled-in' by emission) -: the line was not covered in the spectra --- --- Separator --- EWHa Equivalent width of the Halpha line (for stars only) 0.1nm n_EWHa Note on EWHa number=3 u: the line was covered but no measurable emission component was detected. Significant chromospheric emission may still be present, particularly when this refers to Halpha (e.g. the Halpha photospheric absorption line may be 'filled-in' by emission) -: the line was not covered in the spectra --- FWHb Full width at half maximum of the Hbeta line 10+3km/s --- Separator --- EWHb Equivalent width of the Hbeta line 0.1nm u_EWHb Uncertainty flag on EWHb --- X y: there is an X-ray telescope position available for the source --- Note +: additional information in appena file --- Com Comments --- table1.texTeX version of table1 Patricia Bauer CDS 1996Aug23K.O. Mason <kom@mssl.ucl.ac.uk> UNKNOWN UNKNOWN In table1, 2RE J033711+255926 was identified to HD 224030 instead of HD 22403. Correction made on 13-Feb-1998. J_MNRAS_274_1194.xml