J/AJ/132/676ivo://CDS.VizieR/J/AJ/132/676doi:10.26093/cds/vizier.51320676CDSEisenstein D.J.Liebert J.Koester D.Kleinman S.J.Nitta A.,Smith P.S.Barentine J.C.Brewington H.J.Brinkmann J.Harvanek M.,Krzesinski J.Neilsen E.H.JRLong D.Schneider D.P.Snedden S.A.2008-04-03T09:18:24Z2008-04-03T09:16:34ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsproper-motionsWe present ugriz photometry and optical spectroscopy for 28 DB and DO white dwarfs with temperatures between 28000 and 45000K. About 10 of these are particularly well observed; the remainder are candidates. These are the hottest DB stars yet found, and they populate the DB gap between the hotter DO stars and the familiar DB stars cooler than 30000K. Nevertheless, after carefully matching the survey volumes we find that the ratio of DA stars to DB stars is a factor of 2.5 larger at 30000 than at 20000K, suggesting that the DB gap is indeed deficient and that some kind of atmospheric transformation takes place in roughly 10% of DA stars as they cool from 30000 to 20000K.2006AJ....132..676Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/132/676CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.sdss.org/ : SDSS Home pageII/267 : The SDSS Photometric Catalog, Release 4 (Adelman-McCarthy+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/132/676https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/132/676http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/132/676https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/132/676https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/132/676http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/132/676GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/132/676/table1 (Hot DB White Dwarf Candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/132/676/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/132/676/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/132/676/table1?GETtext/xml+votable180.050000true3.873926111.089256110.0055555555555555566/4130 4150 4180 4826 4857 5616 5786 6253 7229 9239 9967 10519 11450 12406 18093 18607 18777 19429 21855 22762 25994 26037 26085 27294 27333 27732 31291 49107https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/132/676?format=asciiOpticaldefaultJ/AJ/132/676/table1Hot DB White Dwarf CandidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharSpTypeSpectroscopic classsrc.spTypecharPlateSDSS Plate numbermeta.idintFiberSDSS Fiber numbermeta.idintMJDSDSS MJD numbermeta.idintRunSDSS run numbermeta.idintRerunSDSS rerun numbermeta.idintCamcolSDSS camcol numbermeta.idintFieldSDSS field numbermeta.idintObjSDSS obj numbermeta.idintHS?[Y/N] Whether or not (Y or N) the object was targeted as a hot standard (1)meta.codecharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainpmProper motion from the USNOB catalog (in arcsec/century)mas/yrpos.pmfloatpmPADirection of proper motion (north through east)degpos.posAng;pos.pmfloatSDSSdataDisplay the SDSS data for this objectmeta.ref.urlchar