SDSSDR7WD ivo://nasa.heasarc/sdssdr7wd NASA/GSFC HEASARC Kleinman et al. 2026-04-10 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov White Dwarf This table contains a new catalog of spectroscopically confirmed white dwarf stars from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) spectroscopic catalog. The authors find 20,407 white dwarf spectra, representing 19,712 stars, and provide atmospheric model fits to 14,120 DA and 1011 DB white dwarf spectra from 12,843 and 923 stars, respectively. These numbers represent more than a factor of two increase in the total number of white dwarf stars from the previous SDSS white dwarf catalogs based on DR4 data. The distribution of subtypes varies from previous catalogs due to the authors' more conservative, manual classifications of each star in our catalog, supplementing their automatic fits. In particular, they find a large number of magnetic white dwarf stars whose small Zeeman splittings mimic increased Stark broadening that would otherwise result in an overestimated log g if fit as a non-magnetic white dwarf. The authors calculate mean DA and DB masses for their clean, non-magnetic sample and find the DB mean mass is statistically larger than that for the DAs. This table lists the 20,407 white dwarf spectra corresponding to 19,712 distinct stars. This table was created by the HEASARC in January 2013 based on the electronic version of Table 2 from the reference paper which was obtained from the ApJS web site. One duplicate entry was removed from the table in June 2019. This is a service provided by NASA HEASARC . 2013ApJS..204....5K https://heasarc.gsfc.nasa.gov/W3Browse/all/sdssdr7wd.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=sdssdr7wd& GET text/xml 180 99999 true 8.420464 -18.342317 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=sdssdr7wd GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_sdssdr7wd&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Optical public sdssdr7wd Sloan Digital Sky Survey DR7 White Dwarf Catalog gmag_error Uncertainty in SDSS g Band PSF Magnitude mag stat.error;phot.mag;em.opt.B double nullable rmag_error Uncertainty in SDSS r Band PSF Magnitude mag stat.error;phot.mag;em.opt.R double nullable imag_flag Flag for SDSS i Band PSF Magnitude meta.code;phot.mag;em.opt.I char nullable dec Declination degree pos.eq.dec;meta.main double nullable umag SDSS u Band PSF Magnitude mag phot.mag;em.opt.U double nullable gmag_flag Flag for SDSS g Band PSF Magnitude meta.code;phot.mag;em.opt.B char nullable pm_match_flag SDSS Proper Motion Match meta.code char nullable lii Galactic Longitude degree pos.galactic.lon double nullable "__z_ra_dec" System unit vector column double nullable autofit_eff_temp_error Uncertainty in Autofit Effective Temperature K stat.error;phys.temperature.effective int nullable unique_flag Unique Number meta.code char nullable umag_flag Flag for SDSS u Band PSF Magnitude meta.code;phot.mag;em.opt.U char nullable spect_type Human Identification Assigned to Spectrum src.spType char nullable pm_tot SDSS Proper Motion mas/yr pos.pm double nullable bii Galactic Latitude degree pos.galactic.lat double nullable autofit_red_chisquared Autofit Reduced Chi^2 Fit Measurement stat.fit.chi2 double nullable mass Calculated Mass Solar_Mass phys.mass double nullable rmag SDSS r Band PSF Magnitude mag phot.mag;em.opt.R double nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable gmag_snr SDSS g Band Signal-to-Noise Ratio stat.snr;em.opt.B double nullable autofit_spect_type Autofit Type Identification src.spType char nullable plate_number SDSS Plate Number meta.id;obs.field short nullable umag_error Uncertainty in SDSS u Band PSF Magnitude mag stat.error;phot.mag;em.opt.U double nullable autofit_log_g Autofit Logarithm Surface Gravity log(cm/s^2) phys.gravity double nullable "__x_ra_dec" System unit vector column double nullable mass_error Uncertainty in Mass Solar_Mass stat.error;phys.mass double nullable autofit_eff_temp Autofit Effective Temperature K phys.temperature.effective int nullable class Browse Object Classification src.class short nullable spectrum_date SDSS Spectrum Date mjd time.start;obs int nullable "__y_ra_dec" System unit vector column double nullable fiber_number SDSS Fiber Identifier meta.id;instr.param short nullable gmag_extinction SDSS g Band Extinction mag phys.absorption;em.opt.B double nullable pm_pa SDSS Proper Motion Angle; N Through E degree pos.posAng;pos.pm double nullable imag SDSS i Band PSF Magnitude mag phot.mag;em.opt.I double nullable gmag SDSS g Band PSF Magnitude mag phot.mag;em.opt.B double nullable rmag_flag Flag for SDSS r Band PSF Magnitude meta.code;phot.mag;em.opt.R char nullable name SDSS Object Designation meta.id;meta.main char nullable imaging_date SDSS Imaging Date mjd time.start;obs double nullable autofit_log_g_error Uncertainty in Autofit Logarithm Surface Gravity log(cm/s^2) stat.error;phys.gravity double nullable "__row" System index column char nullable zmag_flag Flag for SDSS z Band PSF Magnitude meta.code;phot.mag;em.opt char nullable zmag SDSS z Band PSF Magnitude mag phot.mag;em.opt double nullable zmag_error Uncertainty in SDSS z Band PSF Magnitude mag stat.error;phot.mag;em.opt double nullable imag_error Uncertainty in SDSS i Band PSF Magnitude mag stat.error;phot.mag;em.opt.I double nullable