WDw/MS ivo://nasa.heasarc/mcksion NASA/GSFC HEASARC McCook, Sion 2026-07-24 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Star White Dwarf The Web Version of the McCook-Sion White Dwarf Catalog contains in excess of 500 more entries than the previous published version, the 4th Edition (1999) of the Villanova White Dwarf Catalog. It is a catalog of white dwarfs which have been identified spectroscopically. For each degenerate star, the following data entries with references are provided: (1) catalog coordinate designation or WD number, (2) the right ascension and declination, (3) the spectral type based upon the new system, (4) a catalog symbol denoting binary membership, (5) proper motion and position angle, (6) broad-band UBV Photometry, V, B-V, U-B, (7) multichannel spectrophotometry, V(MC), g-r, (8) Stromgren narrow-band photometry y, b-y, u-b, (9) an absolute visual magnitude based upon the best available color-magnitude calibration or trigonometric parallax, (10) the observed radial velocity uncorrected for gravitational redshift or solar motion, and (11) the trigonometric parallax, with mean error, when available. Note that finding charts for many of the white dwarfs present in this catalog can be found at the following URLs: <pre> <a href="http://procyon.lpl.arizona.edu/WD/charts/">http://procyon.lpl.arizona.edu/WD/charts/</a> <a href="http://deneb.astro.warwick.ac.uk/phsaap/wdcharts/">http://deneb.astro.warwick.ac.uk/phsaap/wdcharts/</a> </pre> The second URL contains the finding charts from T.R. Marsh. This is list with about 600 charts. The University of Arizona charts currently have about 2000 charts, but that list is a work in progress with the intent of eventually having all charts available. As discussed in more detail in the HEASARC_Implementation section, this HEASARC representation of the White Dwarf Catalog contains only a subset of the data presented in either the printed version or the version available at the Villanova website, but is intended to be suitable for cross-identification purposes with other catalogs, e.g., of X-ray sources. The original sources for this catalog should always be consulted for the full set of information that is available for these white dwarfs. This database table is based on the Web version of the Villanova White Dwarf Catalog. It was initially created by the HEASARC in May 2003. It is based on the files WD00-07.txt, WD08-15.txt, WD16-23.txt, and WDNewStars.txt obtained from <pre> <a href="ftp://astronomy.villanova.edu/mccook/Current%20Web%20Version%20of%20WD%20Catalog/">ftp://astronomy.villanova.edu/mccook/Current%20Web%20Version%20of%20WD%20Catalog/</a> </pre> It is automatically updated periodically whenever the catalog's authors update these files. This is a service provided by NASA HEASARC . 1999ApJS..121....1M https://heasarc.gsfc.nasa.gov/W3Browse/all/mcksion.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=mcksion& GET text/xml 180 99999 true 253.5394158 -87.41036097 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=mcksion GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_mcksion&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0833333333333333 Optical public mcksion McCook-Sion White Dwarf Catalog (Web Version) name Catalog Designation meta.id;meta.main char nullable alt_name_1 Alternative Object Name #1 meta.id char nullable alt_name_2 Alternative Object Name #2 meta.id char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable app_mag Apparent Magnitude mag phot.mag;em.opt double nullable app_mag_flag Apparent Magnitude Flag meta.code.error;phot.mag;em.opt char nullable spect_type Spectral Type src.spType char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable ub_color Wide Band U-B Color mag phot.color;em.opt.U;em.opt.B double nullable abs_mag Absolute Magnitude mag phys.magAbs;em.opt double nullable ref_abs_mag Reference Code for Absolute Magnitude meta.ref;phys.magAbs;em.opt char nullable app_mag_type Apparent Magnitude Type char nullable trig_parallax_error Reported Mean Error of Parallax (arcsec) arcsec stat.error;pos.parallax.trig double nullable gmag_sdss Sloan Digital Sky Survey (SDSS) g Magnitude mag phot.mag;em.opt double nullable strom_ub_color Stromgren u-b Color mag phot.color;em.opt.U;em.opt.B double nullable ref_vmag_mcs Multichannel Spectrophotometry Reference Code meta.ref;phot.mag;em.opt.V char nullable ref_sdss Reference Code for Sloan Digital Sky Survey (SDSS) Magnitude and Colors meta.ref;phot.mag;em.opt char nullable sdss_ri_color Sloan Digital Sky Survey (SDSS) r-i Color mag phot.color;em.opt.R;em.opt.I double nullable strom_by_color Stromgren b-y Color mag phot.color;em.opt double nullable lii Galactic Longitude degree pos.galactic.lon double nullable ref_trig_parallax Reference Code for Trigonometric Parallax meta.ref;pos.parallax.trig char nullable trig_parallax Trigonometric Parallax (arcsec) arcsec pos.parallax.trig double nullable ref_ymag Reference Code for y Magnitude meta.code;phot.mag;em.opt char nullable bii Galactic Latitude degree pos.galactic.lat double nullable gr_color g-r Color mag phot.color;em.opt double nullable sdss_iz_color Sloan Digital Sky Survey (SDSS) i-z Color mag phot.color;em.opt.I;em.opt double nullable dir_proper_motion Position Angle of Proper Motion Vector degree pos.posAng;pos.pm double nullable vmag_mcs V Magnitude from Multichannel Spectrophotometry mag phot.mag;em.opt.V double nullable tot_proper_motion Total Proper Motion (arcsec/yr) arcsec/yr pos.pm double nullable gr_color_flag g-r Color Flag meta.code.error;phot.color;em.opt.B;em.opt.R char nullable note_flag Note Flag meta.code char nullable radial_velocity Radial Velocity (km/s) km/s spect.dopplerVeloc;pos.heliocentric double nullable abs_mag_flag Absolute Magnitude Flag meta.code.error;phys.magAbs;em.opt char nullable ref_app_mag Apparent Magnitude Reference Code meta.ref;phot.mag;em.opt char nullable ref_radial_velocity Reference Code for Radial Velocity meta.ref;spect.dopplerVeloc;pos.heliocentric char nullable class Browse Object Classification src.class short nullable sdss_ug_color Sloan Digital Sky Survey (SDSS) u-g Color mag phot.color;em.opt double nullable ref_proper_motion Reference Code for Proper Motion meta.ref;pos.pm char nullable ymag y Magnitude from uvby Photoelectric Observations mag phot.mag;em.opt double nullable bv_color Wide Band B-V Color mag phot.color;em.opt.B;em.opt.V double nullable ub_color_flag Wide Band U-B Color Flag meta.code.error;phot.color;em.opt.U;em.opt.B char nullable bv_color_flag Wide Band B-V Color Flag meta.code.error;phot.color;em.opt.B;em.opt.V char nullable tot_proper_motion_flag Total Proper Motion Flag meta.code.error;pos.pm char nullable sdss_gr_color Sloan Digital Sky Survey (SDSS) g-r Color mag phot.color;em.opt double nullable ref_spect_type Spectral Type Reference Code meta.ref;src.spType char nullable abs_mag_type Absolute Magnitude Type meta.code;phys.magAbs;em.opt char nullable color_class Color Class from Lowell or Luyten PM Surveys src.class.color char nullable