J/MNRAS/449/3966ivo://CDS.VizieR/J/MNRAS/449/3966doi:10.26093/cds/vizier.74493966CDSGianninas A.Curd B.Thorstensen J.R.Kilic M.Bergeron P.,Andrews J.J.Canton P.Agueros M.A.2024-08-14T20:21:20Z2016-01-21T15:41:34ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsvisible-astronomytrigonometric-parallaxproper-motionsinfrared-photometryWe present parallax observations and a detailed model atmosphere analysis of 54 cool and ultracool (Teff<4000K) white dwarfs (WDs) in the solar neighbourhood. For the first time, a large number of cool and ultracool WDs have distance and tangential velocities measurements available. Our targets have distances ranging from 21pc to >100pc, and include five stars within 30pc. Contrary to expectations, all but two of them have tangential velocities smaller than 150km/s thus suggesting Galactic disc membership. The oldest WDs in this sample have WD cooling ages of 10Gyr, providing a firm lower limit to the age of the thick disc population. Many of our targets have uncharacteristically large radii, indicating that they are low-mass WDs. It appears that we have detected the brighter population of cool and ultracool WDs near the Sun. The fainter population of ultracool CO-core WDs remain to be discovered in large numbers. The Large Synoptic Survey Telescope should find these elusive, more massive ultracool WDs in the solar neighbourhood.2015MNRAS.449.3966Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/449/3966CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/382/515 : SDSS ultracool and halo WD candidates (Vidrih+, 2007)J/ApJ/723/684 : NIRSPEC ultracool dwarf radial velocity survey (Blake+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/449/3966https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/449/3966http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/449/3966https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/449/3966https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/449/3966http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/449/3966GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/449/3966/table2 (Astrometry of cool WDs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/449/3966/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/449/3966/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/449/3966/table2?GETtext/xml+votable180.050000true11.341208314.34591670.0055555555555555566/4861 5092 5707 5832 5911 5953 6165 6452 6458 6576 7186 7304 8393 9242 9346 9516 9846 9954 10183 10608 10611 10662 10788 10863 11247 11275 11414 11843 12547 18003 18388 18791 18860 19325 19402 19727 23202 23212 26073 26489 26965 27072 27670 27674 30043 32479 36809 36863 49016 49077 491288.305533028865447e-20 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/449/3966?format=asciiOpticalInfrareddefaultJ/MNRAS/449/3966/table1Journal of Parallax ObservationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS name (JHHMM-DDMM)meta.id;meta.maincharNrefNumber of reference stars used to define the plate solutionmeta.numberintNmeasTotal number of stars measuredmeta.numberintNpixNumber of images usedmeta.numberintEpochsDifferent observing runs, and the numbers in parentheses are the number of images included from each run (YYYY.yy(NN), separated by comma)meta.id;obscharJ/MNRAS/449/3966/table2Astrometry of cool WDsSimbadNameSimbad column added by the CDSmeta.idcharnullableDistDistancepcpos.distance;pos.heliocentricintpmRAProper motion along RAmas/yrpos.pm;pos.eq.raintpmDEProper motion along DEmas/yrpos.pm;pos.eq.decintE_DistError on Dist (upper value)pcstat.error;stat.maxinte_DistError on Dist (lower value)pcstat.errorintVtanTangential velocitykm/sphys.veloc.transverseinte_Vtanrms uncertainty on Vtankm/sstat.errorintUvelU velocity (2)km/sphys.veloc;pos.cartesian.xinte_Uvelrms uncertainty on Uvelkm/sstat.errorintVvelV velocitykm/sphys.veloc;pos.cartesian.yinte_Vvelrms uncertainty on Vvelkm/sstat.errorintWvelW velocitykm/sphys.veloc;pos.cartesian.zinte_Wvelrms uncertainty on Wvelkm/sstat.errorintObsDisplay the observations informationsmeta.ref.urlcharSloanDisplay the SDSS data for this starmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS name (JHHMM+DDMMN)meta.id;meta.maincharn_Name[b] Note on Name (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainplxabsAbsolute parallaxmas/yrpos.parallaxfloate_plxabsrms uncertainty on plxabsmas/yrstat.errorfloatJ/MNRAS/449/3966/table3Optical and near-infrared photometry of cool WDsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS SDSS name (JHHMM+DDMMN)meta.id;meta.maincharn_Name[ab] Note on Name (1)meta.notecharumagSDSS u magnitudemagphot.mag;em.opt.UfloatrmagSDSS r magnitudemagphot.mag;em.opt.Rfloate_rmagrms uncertainty on rmagmagstat.error;phot.magfloatimagSDSS i magnitudemagphot.mag;em.opt.Ifloate_imagrms uncertainty on imagmagstat.error;phot.magfloatzmagSDSS z magnitudemagphot.mag;em.opt.Ifloate_zmagrms uncertainty on zmagmagstat.error;phot.magfloatYmag? UKIDSS Y magnitudemagphot.mag;em.IR.Jfloatnullablee_Ymag? rms uncertainty on Ymagmagstat.error;phot.magfloatnullableJmag? UKIDSS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.magfloatnullableHmag? UKIDSS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.magfloatnullableKmag? UKIDSS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.magfloatnullablee_umagrms uncertainty on umagmagstat.error;phot.magfloatgmagSDSS g magnitudemagphot.mag;em.opt.Bfloate_gmagrms uncertainty on gmagmagstat.error;phot.magfloatJ/MNRAS/449/3966/table4Properties of cool WDsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS name (JHHMM+DDMMN)meta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveinte_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloatMassMasssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatRadRadiussolRadphys.size.radiusfloate_Radrms uncertainty no RadsolRadstat.errorfloatCompComposition (H, He or value of logHe/H)phys.abundchargMAGAbsolute SDSS g magnitudemagphys.magAbsfloate_gMAGrms uncertainty on gMAGmagstat.errorfloattcoolCOCooling time from COGyrtime.epochfloatE_tcoolCOError on tcoolCO (upper value)Gyrstat.error;stat.maxfloate_tcoolCOError on tcoolCO (lower value)Gyrstat.errorfloattcoolHe? Cooling time from HeGyrtime.epochfloatnullableTypeType of WDsrc.classcharE_tcoolHe? Error on tcoolHe (upper value)Gyrstat.error;stat.maxfloatnullablee_tcoolHe? Error on tcoolHe (lower value)Gyrstat.errorfloatnullable