J/MNRAS/399/699ivo://CDS.VizieR/J/MNRAS/399/699doi:10.26093/cds/vizier.73990699CDSMortlock D.J.Peiris H.V.Ivezic Z.2024-07-09T20:16:05Z2010-04-09T11:59:12ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsastronomical-modelsstellar-atmospheresIt is possible to reliably identify white dwarfs (WDs) without recourse to spectra, instead using photometric and astrometric measurements to distinguish them from main-sequence stars and quasars. WDs' colours can also be used to infer their intrinsic properties (effective temperature, surface gravity, etc.), but the results obtained must be interpreted with care. The difficulties stem from the existence of a solid angle degeneracy, as revealed by a full exploration of the likelihood, although this can be masked if a simple best-fitting approach is used. Conversely, this degeneracy can be broken if a Bayesian approach is adopted, as it is then possible to utilize the prior information on the surface gravities of WDs implied by spectroscopic fitting. The benefits of such an approach are particularly strong when applied to outliers, such as the candidate halo and ultracool WDs identified by Vidrih et al. A reanalysis of these samples confirms their results for the latter sample, but suggests that most of the halo candidates are thick-disc WDs in the tails of the photometric noise distribution.2009MNRAS.399..699Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/399/699CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/399/699https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/399/699http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/399/699https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/399/699https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/399/699http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/399/699GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/399/699/haloWD (Estimated atmosphere model parameters (H and He), and Model selection quantities for the 34 V07 candidate halo WDs (tables 1, 2 and 3 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/699/haloWD?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/699/haloWD?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/699/haloWD?GETtext/xml+votable180.050000true0.68345831.16272220.005555555555555556Cone search capability for table J/MNRAS/399/699/table4 (*Estimated model parameters of the 17 V07 candidate halo WDs with spectroscopic fits presented by Eisenstein et al. (2006, Cat. J/ApJS/167/40))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/699/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/699/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/699/table4?GETtext/xml+votable180.050000true1.48850.30922220.005555555555555556Cone search capability for table J/MNRAS/399/699/ultracool (Estimated atmosphere model parameters (H and He), and Model selection quantities for the 24 V07 candidate ultra-cool WDs (tables 5, 6 and 7 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/699/ultracool?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/699/ultracool?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/699/ultracool?GETtext/xml+votable180.050000true2.7815417-0.51744440.0055555555555555566/17746-17748 17807 17811 17814 17837 18003 18020 18022 18024 18069-18070 18073 18078 18083 18091 18093 18098 18177 18766-18767 18771 18774 18779 18791 18795 18830 18833 18850 18856 18859-18860 18864 18880 19045 19051 19087 19095-19096 19101 19109 19113 19200 19457 23208 30038 30044 30046 36863https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/399/699?format=asciidefaultJ/MNRAS/399/699/haloWDEstimated atmosphere model parameters (H and He), and Model selection quantities for the 34 V07 candidate halo WDs (tables 1, 2 and 3 of paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (JHHMMSS.ss+DDMMSS+s)meta.id;meta.maincharTe(H)Effective temperature for H atmosphereKphys.temperature.effectivedoublee_Te(H)rms uncertainty on TeffKstat.errordoublelogg(H)Surface gravity for H atmospherelog(cm.s**-2)phys.gravityfloate_logg(H)rms uncertainty on logglog(cm.s**-2)stat.errorfloatM(H)Mass for H atmospheresolMassphys.massfloate_M(H)rms uncertainty on MasssolMassstat.errorfloatAge(H)Age for H atmosphereyrtime.agedoublee_Age(H)rms uncertainty on Ageyrstat.errordoubler(H)Distance for H atmospherepcpos.distanceinte_r(H)rms uncertainty in r(H)pcstat.errorintVt(H)Tangential velocity for H atmospherekm/sphys.veloc.transverseinte_Vt(H)rms uncertainty on Vtankm/sstat.errorintTe(He)Effective temperature for He atmosphereKphys.temperature.effectivedoublee_Te(He)rms uncertainty on TeffKstat.errordoublelogg(He)Surface gravity for He atmospherelog(cm.s**-2)phys.gravityfloate_logg(He)rms uncertainty on logglog(cm.s**-2)stat.errorfloatM(He)Mass for He atmospheresolMassphys.massfloate_M(He)rms uncertainty on MasssolMassstat.errorfloatAge(He)Age for He atmosphereyrtime.agedoublee_Age(He)rms uncertainty on Ageyrstat.errordoubler(He)Distance for He atmospherepcpos.distanceinte_r(He)rms uncertainty in r(He)pcstat.errorintVt(He)Tangential velocity for He atmospherekm/sphys.veloc.transverseinte_Vt(He)rms uncertainty on Vtankm/sstat.errorintgb(H)Best-fit log g values estimated using the uninformative g prior for H (1)log(cm.s**-2)phys.gravityfloatgb(He)Best-fit log g values estimated using the uninformative g prior for He (1)log(cm.s**-2)phys.gravityfloatchi2(H)Miminum chi^2^ value for Hstat.fit.chi2floatchi2(He)Miminum chi^2^ value for Hestat.fit.chi2floatEv(H)Evidence value for H (2)stat.fit.paramdoubleEv(He)Evidence value for He (2)stat.fit.paramdoublePr(H)Probability that the WD atmosphere is Hstat.fit.paramfloat_RAPosition from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition from SDSS name (declination part)degpos.eq.dec;meta.mainNotesIndicates whether the model selection result is driven by the data, the informative g prior, or the 10:1 model priormeta.notecharJ/MNRAS/399/699/table4*Estimated model parameters of the 17 V07 candidate halo WDs with spectroscopic fits presented by Eisenstein et al. (2006, Cat. J/ApJS/167/40)SDSSSDSS name (JHHMMSS.ss+DDMMSS+s)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeWD typesrc.spTypecharloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloatTeffEffective temperatureKphys.temperature.effectiveinte_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveint_RAPosition from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition from SDSS name (declination part)degpos.eq.dec;meta.mainJ/MNRAS/399/699/ultracoolEstimated atmosphere model parameters (H and He), and Model selection quantities for the 24 V07 candidate ultra-cool WDs (tables 5, 6 and 7 of paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name (JHHMMSS.ss+DDMMSS+s)meta.id;meta.maincharTe(H)Effective temperature for H atmosphereKphys.temperature.effectivedoublee_Te(H)rms uncertainty on TeffKstat.errordoublelogg(H)Surface gravity for H atmospherelog(cm.s**-2)phys.gravityfloate_logg(H)rms uncertainty on logglog(cm.s**-2)stat.errorfloatM(H)Mass for H atmospheresolMassphys.massfloate_M(H)rms uncertainty on MasssolMassstat.errorfloatAge(H)Age for H atmosphereyrtime.agedoublee_Age(H)rms uncertainty on Ageyrstat.errordoubler(H)Distance for H atmospherepcpos.distanceinte_r(H)rms uncertainty in r(H)pcstat.errorintVt(H)Tangential velocity for H atmospherekm/sphys.veloc.transverseinte_Vt(H)rms uncertainty on Vtankm/sstat.errorintTe(He)Effective temperature for He atmosphereKphys.temperature.effectivedoublee_Te(He)rms uncertainty on TeffKstat.errordoublelogg(He)Surface gravity for He atmospherelog(cm.s**-2)phys.gravityfloate_logg(He)rms uncertainty on logglog(cm.s**-2)stat.errorfloatM(He)Mass for He atmospheresolMassphys.massfloate_M(He)rms uncertainty on MasssolMassstat.errorfloatAge(He)Age for He atmosphereyrtime.agedoublee_Age(He)rms uncertainty on Ageyrstat.errordoubler(He)Distance for He atmospherepcpos.distanceinte_r(He)rms uncertainty in r(He)pcstat.errorintVt(He)Tangential velocity for He atmospherekm/sphys.veloc.transverseinte_Vt(He)rms uncertainty on Vtankm/sstat.errorintgb(H)Best-fit log g values estimated using the uninformative g prior for H (1)log(cm.s**-2)phys.gravityfloatgb(He)Best-fit log g values estimated using the uninformative g prior for He (1)log(cm.s**-2)phys.gravityfloatchi2(H)Miminum chi^2^ value for Hstat.fit.chi2floatchi2(He)Miminum chi^2^ value for Hestat.fit.chi2floatEv(H)Evidence value for H (2)stat.fit.paramdoubleEv(He)Evidence value for He (2)stat.fit.paramdoublePr(H)Probability that the WD atmosphere is Hstat.fit.paramfloatNotesIndicates whether the model selection result is driven by the data, the informative g prior, or the 10:1 model priormeta.notechar_RAPosition from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPosition from SDSS name (declination part)degpos.eq.dec;meta.main