J/other/RAA/19.8ivo://CDS.VizieR/J/other/RAA/19.88doi:10.26093/cds/vizier/dx/bjkiiCDSKong X.Luo A.-L.Li X.-R.2026-02-10T20:07:42Z2020-11-20T10:14:25ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starseffective-temperatureultraviolet-photometryradial-velocityIn this study, we employ machine learning to build a catalog of DB white dwarfs (DBWDs) from the LAMOST Data Release (DR) 5. Using known DBs from SDSS DR14, we selected samples of high-quality DB spectra from the LAMOST database and applied them to train the machine learning process. Following the recognition procedure, we chose 351 DB spectra of 287 objects, 53 of which were new identifications. We then utilized all the DBWD spectra from both SDSS DR14 and LAMOST DR5 to construct DB templates for LAMOST 1D pipeline reductions. Finally, by applying DB parameter models provided by D. Koester and the distance from Gaia DR2, we calculated the effective temperatures, surface gravities and distributions of the 3D locations and velocities of all DBWDs.2019RAA....19...88Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/19.88CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/164 : LAMOST DR5 catalogs (Luo+, 2019)J/AJ/146/34 : Infrared photometry of DA white dwarfs from LAMOST (Zhang+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RAA/19.88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RAA/19.88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RAA/19.88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RAA/19.88https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RAA/19.88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RAA/19.88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap7.447298006782415e-19 1.4134638842407062e-18UVdefaultJ/other/RAA/19.88/dbwdNewly identified DB white dwarfs (DBWDs)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLAMOSTLAMOST designations of the objects, JHHMMSS.ss+DDMMSS.smeta.id;meta.maincharM-P-S-FLAMOST Modified Julian date-Planid_SPid-Fiberidmeta.idcharTypeClassification of objects derived from ML methodsrc.classcharRVDBRadial velocity of each spectrumkm/sphys.veloc;pos.heliocentricinte_RVDB? Uncertainty of radial velocity of each spectrumkm/sstat.errorintnullableRVM? Radial velocity of M companionskm/sphys.veloc;pos.heliocentricintnullablee_RVM? Uncertainty of radial velocity of M companionskm/sstat.errorintnullableTeffEffective temperatureKphys.temperature.effectiveinte_TeffUncertainty of Effective temperatureKstat.error;phys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggUncertainty of Surface gravitylog(cm.s**-2)stat.errorfloatFUV? Magnitude of FUV from GALEXmagphot.mag;em.UV.100-200nmfloatnullablee_FUV? Uncertainty of Magnitude of FUV from GALEXmagstat.errorfloatnullableNUV? Magnitude of NUV from GALEXmagphot.mag;em.UVfloatnullablee_NUV? Uncertainty of Magnitude of NUV from GALEXmagstat.errorfloatnullableS/NMedian S/N from catalog of LAMOST DR5stat.snrfloatpmRA? Proper motion at J2015.5 in the direction of RA, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublenullablee_pmRA? Uncertainty of pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion at J2015.5 in the direction of DECmas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Uncertainty of pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullablePlx? Absolute stellar parallax of the source at the reference epoch J2015.5maspos.parallax.trigfloatnullablee_Plx? Uncertainty of parallaxmasstat.error;pos.parallaxfloatnullableMass? Mass obtained from literaturesolMassphys.massfloatnullableAge? Age obtained from literatureMyrtime.agefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar