J/AJ/125/2239ivo://CDS.VizieR/J/AJ/125/2239doi:10.26093/cds/vizier.51252239CDSO'dwyer I.J.Chu Y.-H.Gruendl R.A.Guerrero M.A.Webbink R.F.2023-04-06T16:50:55Z2007-10-24T14:08:45ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frx-ray-sourceswhite-dwarf-starsInspired by the hard X-ray emission from WD 2226-210, the central star of the Helix Nebula, we have made a systematic search for similar sources by correlating the white dwarf catalog of McCook & Sion (1999, See Cat. <III/235>) and the ROSAT Position Senstive Proportional Counter (PSPC) point-source catalog of White et al. (2000, Cat. <IX/31>). We find 76 white dwarfs coincident with X-ray sources at a high level of confidence. Among these sources, 17 show significant hard X-ray emission at energies greater than 0.5keV. Twelve of these white dwarfs with hard X-ray emission are in known binary systems, in two of which the accretion of the close companion's material onto the white dwarf produces hard X-ray emission, and in the other 10 the late-type companions' coronal activity emits hard X-rays. One apparently single white dwarf is projected near an active galactic nucleus that is responsible for the hard X-ray emission. The remaining four white dwarfs and two additional white dwarfs with hard X-ray emission appear single.2003AJ....125.2239Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/125/2239CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/31 : The WGACAT version of ROSAT sources (White+ 2000)III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/125/2239https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/125/2239http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/125/2239https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/125/2239https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/125/2239http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/125/2239GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/125/2239/table1 (White dwarfs coincident with WGACAT X-ray sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2239/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2239/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2239/table1?GETtext/xml+votable180.050000true7.4832917-63.40922220.0055555555555555566/222 311 2078 2568 3345 4340 4699 5025 5871 5893 5941 6040 7212 7220 7606 7758 9433 9506 9610 9614 9651 10169 10386 10969 10999 11017 11081 11127 11514 11683 11690 12111 12302 12983 13013 13182 14654 14667 15351 15391 15393 17415 17716 19970 20287 21416 21529 21885 22069 22300 22749 22857 22870 23545 23549 25585 25693 26969 27524 28026 28126 28389 28498 28559 30506 32516 32847 32954 33029 33639 33955 34362 34540 34822 35573 35755 35823 37427 37790 39206 39825 40356 42115 42760 45744 45962 46180 46598 46700 47125 47459 47525 48313https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/125/2239?format=asciiX-raydefaultJ/AJ/125/2239/table1White dwarfs coincident with WGACAT X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWhite dwarf number (3)meta.id;meta.maincharNameCommon namemeta.idcharWDTypeWhite dwarf spectral typesrc.spTypecharWGACATThe WGA catalog number (1WGA)meta.idcharRORThe ROSAT PSPC observation numbermeta.idintExpThe PSPC exposure timekstime.duration;obs.exposurefloatPosCoPositional coincidence (1)meta.codecharSoftThe soft (0.1-0.4keV) band counts (2)ctphot.count;em.X-rayinte_SoftError in Softctstat.errorintMediumThe medium (0.4-0.9keV) band counts (2)ctphot.count;em.X-rayinte_MediumError in Mediumctstat.errorintHardThe hard (0.9-2.4keV) band counts (2)ctphot.count;em.X-rayinte_HardError in Hardctstat.errorintSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main