J/ApJ/882/106ivo://CDS.VizieR/J/ApJ/882/106doi:10.26093/cds/vizier.18820106CDSGenest-Beaulieu C.Bergeron P.2021-09-10T14:40:21Z2021-03-03T07:58:06ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starseffective-temperaturestellar-masseschemical-abundancesvisible-astronomysloan-photometryspectroscopysurveysastronomical-modelsstellar-atmospheresWe present a comprehensive analysis of DB white dwarfs drawn from the Sloan Digital Sky Survey, based on model fits to ugriz photometry and medium-resolution spectroscopy from the Sloan Digital Sky Survey. We also take advantage of the exquisite trigonometric parallax measurements recently obtained by the Gaia mission. Using the so-called photometric and spectroscopic techniques, we measure the atmospheric and physical parameters of each object in our sample (Teff, logg, H/He, Ca/He, R, M), and compare the values obtained from both techniques in order to assess the precision and accuracy of each method. We then explore in great detail the surface gravity, stellar mass, and hydrogen abundance distributions of DB white dwarfs as a function of effective temperature. We present some clear evidence for a large population of unresolved double-degenerate binaries composed of DB+DB and even DB+DA white dwarfs. In the light of our results, we finally discuss the spectral evolution of DB white dwarfs, in particular the evolution of the DB-to-DA ratio as a function of Teff, and we revisit the question of the origin of hydrogen in DBA white dwarfs.2019ApJ...882..106Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/882/106CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wd : Spectroscopically identified white dwarfs (McCook+, 2014)III/210 : Spectroscopically Identified White Dwarfs (McCook+, 1999)III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/363/1040 : DB white dwarfs from the Hamburg/ESO survey (Friedrich+, 2000)J/ApJS/156/47 : DA WDs from the Palomar Green Survey (Liebert+, 2005)J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)J/AJ/132/676 : SDSS hot DB white dwarfs (Eisenstein+, 2006)J/A+A/470/1079 : UVES/VLT spectra of white dwarfs (Voss+, 2007)J/A+A/505/441 : UVES/VLT spectra of white dwarfs (Koester+, 2009)J/ApJ/714/1037 : White dwarfs from the Kiso survey (Limoges+, 2010)J/ApJ/743/138 : Spectroscopic survey of bright WDs (Gianninas+, 2011)J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015)J/A+A/583/A86 : DB white dwarfs in SDSS DR10 and DR12 (Koester+, 2015)J/MNRAS/455/3413 : White dwarf and subdwarf stars in SDSS DR12 (Kepler+, 2016)J/ApJ/848/11 : Spectroscopic & photometric analysis of WDs (Bedard+, 2017)J/PASP/130/H4203 : Spectroscopically confirmed DB white dwarfs (Kong+, 2018)J/other/RAA/19.88 : DB white dwarfs from the LAMOST DR5 (Kong+, 2019)J/MNRAS/482/4570 : Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019)J/A+A/634/A93 : Limb-darkening coeff. for compact stars (Claret+, 2020)J/A+A/641/A157 : Limb-darkening coefficients for white dwarfs (Claret+, 2020)http://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/882/106https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/882/106http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/882/106https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/882/106https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/882/106http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/882/106GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/882/106/table1 (List of photometric/spectroscopic atmospheric/physical parameter)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/882/106/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/882/106/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/882/106/table1?GETtext/xml+votable180.050000true0.2296153-4.41361860.0055555555555555565/2821 4694 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31429 31444 31447 31455 31466 31480 31485 31530 31531 31548 31550 31616 31619 31628 31630 31641 31642 31650 31657 31661 31670 31675 31676 31689 31691 31694 31723 31725 31728 31734 31737 31738 31742 31743 31905 32396 32399 32402 32410 32413 32415 32421 32425 32427 32434 32440 32441 32462 32473 32486 32508 32509 32519 32530 32538 32554 32682 32686 32699 36703 36717 36725 36729 36731 36773 36781 36783 36786 36787 36788 36795 36801 36803 36809 36840 36843 36856 36858 36861 36863 40959 45046 45050 45055 48888 48890 48892 49015 49017 49019 49081 49087 49095 49107 49122 49130 49149https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/882/106?format=asciiOpticaldefaultJ/ApJ/882/106/table3List of DB+DB double degenerate candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS identifier (HHMMSS.ss+DDMMSS.ss; J2000)meta.id;meta.maincharFlaga = based on photometry onlymeta.code.errorcharpTeff[12181/31289] Photometric surface effective temperatureKphys.temperature.effectiveintpMstar[0.2/0.6] Photometric stellar masssolMassphys.massfloatsTeff[12771/35428] Spectroscopic surface effective temperatureKphys.temperature.effectiveintsMstar[0.3/0.9] Spectroscopic stellar masssolMassphys.massfloatlogH[-6.4/-3.1] log(H/He)phys.abundfloatJ/ApJ/882/106/table2List of DA+DB double degenerate candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS identifier (HHMMSS.ss+DDMMSS.ss; J2000)meta.id;meta.maincharFlagSource flag (1)meta.code.errorcharpTeff[12620/38700] Photometric surface effective temperatureKphys.temperature.effectiveintpMstar[0.2/0.7] Photometric stellar masssolMassphys.massfloatsTeff[14110/18870] Spectroscopic surface effective temperatureKphys.temperature.effectiveintsMstar[0.39/0.91] Spectroscopic stellar masssolMassphys.massfloatlogH[-6.1/-4.5] log(H/He)phys.abundfloatTDA[9580/14120] Deconvoluted effective temperature, component DAKphys.temperature.effectiveintTDB[15260/48810] Deconvoluted effective temperature, component DBKphys.temperature.effectiveintJ/ApJ/882/106/table1List of photometric/spectroscopic atmospheric/physical parametersig/pi[0.003/5.4]? {sigma}_{pi}_/{pi}pos.parallax.trig;stat.error;arith.ratiofloatnullableNotesNotes (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS identifier (HHMMSS.ss+DDMMSS.ss; J2000)meta.id;meta.maincharprimarypTeff[8837/52475]? Photometric surface effective temperatureKphys.temperature.effectiveintnullableplogg[5.3/9.6]? Log of photometric surface gravitylog(cm.s**-2)phys.gravityfloatnullablepMstar[0.04/1.4]? Photometric stellar masssolMassphys.massfloatnullablesTeff[9727/54438] Spectroscopic surface effective temperatureKphys.temperature.effectiveintslogg[6/10.5] Log of spectroscopic surface gravitylog(cm.s**-2)phys.gravityfloatsMstar[-0.2/6.7] Spectroscopic stellar masssolMassphys.massfloatl_logHLimit flag on logHmeta.code.errorcharlogH[-7.81/-2] log(H/He)phys.abundfloatlogCa[-7.5/-6]? log(Ca/He)phys.abundfloatnullableSN[1.9/97] Spectroscopic signal-to-noisestat.snrfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_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