J/A+A/470/1079ivo://CDS.VizieR/J/A+A/470/1079doi:10.26093/cds/vizier.34701079CDSVoss B.Koester D.Napiwotzki R.Christlieb N.Reimers D.2018-01-08T06:37:59Z2014-03-13T08:50:49ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsapparent-magnitudeeffective-temperatureWe present a detailed spectroscopic analysis of the stars with helium-dominated spectra in the ESO Supernova Ia Progenitor Survey (SPY). Atmospheric parameters, masses, and abundances of trace hydrogen are determined and discussed in the context of spectral evolution of white dwarfs. The spectra are compared with theoretical model atmospheres using a {chi}^2^ fitting technique, leading to determinations of effective temperature, surface gravity, and hydrogen abundance. Our final sample contains 71 objects, of which 6 are new detections and 14 are reclassified from DB to DBA because of the presence of H lines. One is a cool DO with weak HeII lines, 2 are composite DB+dM. 55% of the DB sample show hydrogen and are thus DBA, a significantly higher fraction than found before.2007A&A...470.1079Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/470/1079CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)J/A+A/378/556 : UVES/VLT spectra of white dwarfs (Koester+, 2001)J/A+A/505/441 : UVES/VLT spectra of white dwarfs (Koester+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/470/1079https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/470/1079http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/470/1079https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/470/1079https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/470/1079http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/470/1079GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/470/1079/table1 (Properties and parameters of the DB stars without visible hydrogen)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/470/1079/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/470/1079/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/470/1079/table1?GETtext/xml+votable180.050000true20.451125-0.18177780.005555555555555556Cone search capability for table J/A+A/470/1079/table2 (Properties and parameters of the DB stars with hydrogen features in their spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/470/1079/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/470/1079/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/470/1079/table2?GETtext/xml+votable180.050000true0.8818333-16.73294440.0055555555555555566/4175 4312 4344 8384 8428 8510 8550 16533 17094 17158 17718 18006 18052 18557 18649 18950 18988 19097 19252 19418 19704 22534 22565 22761 23236 24102 24796 25072 25389 25502 25840 25954 26001 26010 26551 26565 27019 27243 27785 28209 29855 30855 32385 32462 33591 33959 34027 34693 34913 35647 35711 35826 36509 36578 36838 36861 38955 40307 40540 43948 43999 44291 44673 44738 44936 44953 46448 46688 48588https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/470/1079?format=asciiOpticaldefaultJ/A+A/470/1079/table1Properties and parameters of the DB stars without visible hydrogenrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainn_mag[BVy] Observed band for magnitude (G1)meta.notecharmagMagnitude in band specified in n_magmagphot.magfloatTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatM? Stellar masssolMassphys.massfloatnullableComCommentsmeta.noteNote[2/4]? Note (1)meta.noteintnullableTeff2? Teff from fit (2)Kphys.temperature.effectiveintnullablelogg2? Surface gravity from fit (2)log(cm.s**-2)phys.gravityfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharONamesOther name(s)meta.idcharJ/A+A/470/1079/table2Properties and parameters of the DB stars with hydrogen features in their spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainn_mag[BVy mc] Observed band for magnitude (G1)meta.notecharmagMagnitude in band specified in n_magmagphot.magfloatu_[H/He][~] Uncertain H abundancephys.abundchar[H/He]H abundance: log(H/He)phys.abundfloatTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatM? Stellar masssolMassphys.massfloatnullableAge? Age1e+08yrtime.agefloatnullableMH? H masssolMassphys.massdoublenullableComCommentsmeta.noteNote? Note (2)meta.notechar[H/He]2? log(H/He) from second spectrum (3)phys.abundfloatnullableTeff2? Teff from second spectrum (3)Kphys.temperature.effectiveintnullablelogg2? Surface gravity from second spectrum (3)log(cm.s**-2)phys.gravityfloatnullableM2? Stellar mass from second spectrum (3)solMassphys.massfloatnullableAge2? Age from second spectrum (3)1e+08yrtime.agefloatnullableMH2? H mass from second spectrum (3)solMassphys.massdoublenullableSimbadSimbad column added by the CDSmeta.ref.urlcharONamesOther name(s)meta.idchar