J/ApJ/848/11ivo://CDS.VizieR/J/ApJ/848/11doi:10.26093/cds/vizier.18480011CDSBedard A.Bergeron P.Fontaine G.2018-09-26T14:38:21Z2018-07-12T14:57:52ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsstellar-spectral-typeseffective-temperaturestellar-radiistellar-massesstellar-distanceWe present a detailed spectroscopic and photometric analysis of 219 DA and DB white dwarfs for which trigonometric parallax measurements are available. Our aim is to compare the physical parameters derived from the spectroscopic and photometric techniques, and then to test the theoretical mass-radius relation for white dwarfs using these results. The agreement between spectroscopic and photometric parameters is found to be excellent, especially for effective temperatures, showing that our model atmospheres and fitting procedures provide an accurate, internally consistent analysis. The values of surface gravity and solid angle obtained, respectively, from spectroscopy and photometry, are combined with parallax measurements in various ways to study the validity of the mass-radius relation from an empirical point of view. After a thorough examination of our results, we find that 73% and 92% of the white dwarfs are consistent within 1{sigma} and 2{sigma} confidence levels, respectively, with the predictions of the mass-radius relation, thus providing strong support to the theory of stellar degeneracy. Our analysis also allows us to identify 15 stars that are better interpreted in terms of unresolved double degenerate binaries. Atmospheric parameters for both components in these binary systems are obtained using a novel approach. We further identify a few white dwarfs that are possibly composed of an iron core rather than a carbon/oxygen core, since they are consistent with Fe-core evolutionary models.2017ApJ...848...11Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/848/11CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wd : Spectroscopically identified white dwarfs (McCook+, 2014)J/AJ/154/32 : Solar neighborhood. XXXIX. Nearby WDs (Subasavage+, 2017)J/A+A/583/A86 : DB white dwarfs in SDSS DR10 and DR12 (Koester+, 2015)J/ApJS/219/19 : Census of nearby white dwarfs from SUPERBLINK (Limoges+, 2015)J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015)J/AJ/147/129 : White dwarfs within 25pc of the Sun (Sion+, 2014)J/ApJ/743/138 : Spectroscopic survey of bright white dwarfs (Gianninas+, 2011)J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)J/MNRAS/403/1949 : UBV(RcIc)JHK photometry of HIP nearby stars (Koen+, 2010)J/ApJ/712/585 : Apparent velocity measurements of DA WDs (Falcon+, 2010)J/A+A/505/441 : UVES/VLT spectra of white dwarfs (Koester+, 2009)J/AJ/135/1239 : Spectral distances to DA white dwarfs (Holberg+, 2008)J/A+A/470/1079 : UVES/VLT spectroscopy of white dwarfs (Voss+, 2007)J/ApJ/663/1291 : DZ stars in SDSS DR4 (Dufour+, 2007)J/ApJ/657/1013 : IR photometry of 2MASS/Spitzer white dwarfs (Tremblay+, 2007)J/AJ/134/252 : New nearby white dwarf systems (Subasavage+, 2007)J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)J/ApJS/161/394 : Low-luminosity companions to white dwarfs (Farihi+, 2005)J/ApJS/156/47 : DA white dwarfs from the Palomar Green Survey (Liebert+, 2005)J/ApJ/631/1100 : Atmospheric parameters of DA white dwarfs (Gianninas+, 2005)J/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/848/11https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/848/11http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/848/11https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/848/11https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/848/11http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/848/11GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/848/11/table1 (Adopted physical parameters of white dwarfs with reliable data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/848/11/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/848/11/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/848/11/table1?GETtext/xml+votable180.050000true1.278420673.21927360.0055555555555555566/60 469 709 743 1287 1434 1890 2113 2157 2364 2366 2536 2733 2761 3682 3819 4559 4566 4947 5050 5816 5827 6118 6442 6454 6705 7212 7478 8361 8559 9071 9109 9336 9424 9483 9751 9840 9985 10173 10359 10378 10386 10504 11031 11127 11642 11984 12157 12747 12936 13013 13085 13295 13327 13714 14391 14400 14533 14559 14865 15462 15474 16158 16329 16344 16420 16440 17331 17352 17400 17463 17568 17625 17733 17748 17790 17879 18079 18086 18133 18368 18398 18548 18902 19097 19119 19141 19434 20155 20404 20738 20940 21691 22149 22214 22709 22936 23947 24748 24795 25084 25634 25792 26299 26471 27538 28028 28260 28271 28460 28559 28574 29486 30093 30251 30415 30440 30694 31172 31637 31677 31690 31698 31708 31872 32436 33011 33015 33198 33243 34026 34864 35490 35957 35978 37084 38381 38803 38955 40070 41638 42074 42091 42700 42760 43537 44630 44971 45110 45177 47476 47487 47907 47957 48621 48699 48728https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/848/11?format=asciidefaultJ/ApJ/848/11/table1Adopted physical parameters of white dwarfs with reliable datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWhite Dwarf identifier (HHMM+DDd; B1950)meta.id;meta.maincharNameCommon namemeta.idcharSpTWD spectral typesrc.spTypecharDist[2.6/216] Parallactic distance D_{pi}_pcpos.distancefloate_Dist[0.01/35] Uncertainty in Distpcstat.errorfloatTeff[6354/67133] Effective temperatureKphys.temperature.effectiveinte_Teff[61/3225] Uncertainty in TeffKstat.error;phys.temperature.effectiveintf_TeffMethod code for determining Teff (S=spectroscopic or P=photometric)meta.codecharlog(g)[7.3/9.4] log surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)[0.04/0.3] Uncertainty in log(g)log(cm.s**-2)stat.errorfloatRad[0.003/0.03] Photometric technique derived radius (R_{pi}_)solRadphys.size.radiusfloate_Rad[0.0001/0.005] Uncertainty in RadsolRadstat.errorfloatMass[0.2/4] Mass from log(g) and RadiussolMassphys.massfloate_Mass[0.05/1.4] Uncertainty in MasssolMassstat.error;phys.massfloatDelta[0.01/9.5] Difference between distance measurements (1)pos.distance;arith.difffloatNote[1/3]? Additional note (2)meta.noteintnullableWDCatDisplay data for this white dwarf from Gianninas+, 2011, J/ApJ/743/138 ; Limoges+, 2015, J/ApJS/219/19 ; Farihi+, 2005, J/ApJS/161/394meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD (declination part)degpos.eq.dec;meta.main