J/AJ/160/252ivo://CDS.VizieR/J/AJ/160/252doi:10.26093/cds/vizier.51600252CDSVincent O.Bergeron P.Lafreniere D.2022-09-30T21:49:37Z2021-02-15T07:50:28ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsvariable-starsinfrared-photometryvisible-astronomybroad-band-photometryproper-motionsstellar-masseseffective-temperatureThe Gaia satellite recently released parallax measurements for ~260000 high-confidence white dwarf candidates, allowing for precise measurements of their physical parameters. By combining these parallaxes with Pan-STARRS and u-band photometry, we measured the effective temperature and stellar mass for all white dwarfs in the Northern Hemisphere within 100pc of the Sun, and identified a sample of ZZ-Ceti white dwarf candidates within the so-called instability strip. We acquired high-speed photometric observations for 90 candidates using the PESTO camera attached to the 1.6m telescope at the Mont-Megantic Observatory. We report the discovery of 38 new ZZ-Ceti stars, including two very rare ultramassive pulsators. We also identified five possibly variable stars within the strip, in addition to 47 objects that do not appear to show any photometric variability. However, several of those could be variable with an amplitude below our detection threshold, or could be located outside the instability strip due to errors in their photometric parameters. In the light of our results, we explore the trends of the dominant period and amplitude in the M--Teff plane, and briefly discuss the question of the purity of the ZZ-Ceti instability strip (i.e., a region devoid of non-variable stars).2020AJ....160..252Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/252CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/simbad : Simbad objects catalogue (M.Wenger 2000)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/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/631/1100 : Atmospheric parameters of DA white dwarfs (Gianninas+, 2005)J/ApJ/643/402 : Cool white dwarfs in the solar neighborhood (Kawka+, 2006)J/A+A/447/173 : 3D-kinematics white dwarfs from SPY. II. (Pauli+, 2006)J/A+A/505/441 : UVES/VLT spectra of white dwarfs (Koester+, 2009)J/MNRAS/407/681 : Proper motions FBS blue stellar objects (Mickaelian+, 2010)J/ApJ/743/138 : Spectroscopic survey bright white dwarfs (Gianninas+, 2011)J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)J/AJ/146/34 : IR photometry of DA white dwarfs from LAMOST (Zhang+, 2013)J/ApJ/794/35 : Binary white dwarfs atmospheric parameters (Gianninas+,2014)J/ApJ/815/63 : SDSS wide double white dwarfs spectroscopy (Andrews+, 2015)J/MNRAS/454/2787 : LAMOST DR2 white dwarfs (Guo+, 2015)J/ApJS/219/19 : Census nearby white dwarfs from SUPERBLINK (Limoges+, 2015)J/ApJS/232/23 : 27 pulsating DA WDs follow-up observations (Hermes+, 2017)J/A+A/616/A10 : 46 open clusters GaiaDR2 diagrams (Gaia Collaboration, 2018)J/A+A/623/A110 : Gaia DR2. Variable stars in CMD (Gaia Collaboration+, 2019)J/MNRAS/482/4570 : Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/252https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/252http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/252https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/252https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/252http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/252GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/160/252/table1 (The ZZ Ceti Candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/252/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/252/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/252/table1?GETtext/xml+votable180.050000true7.76894712.5797760.005555555555555556Cone search capability for table J/AJ/160/252/table3 (New ZZ Ceti white dwarfs and properties of possible pulsators)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/252/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/252/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/252/table3?GETtext/xml+votable180.050000true3.137277732.68688950.005555555555555556Cone search capability for table J/AJ/160/252/table4 (Non Observed to Vary (NOV) candidate properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/252/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/252/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/252/table4?GETtext/xml+votable180.050000true7.768955512.57978670.0055555555555555566/7 118 382 446 448 782 964 1141 1240 1366 1499 1535 1836 2010 2146 2530 2680 2754 2757 2886 2933 2953 3012 3098 3286 3647 3852 4089 4441 4565 4603 4782 4891 4917 5427 5574 5580 5621 5659 5943 6159 6683 6771 6800 6846 6988 7051 7410 7812 7921 9266-9267 9352 9359 9398 9554 9615-9616 10031 10219 10352 10966 11130 11282 11297 11366 11594 11962 12476 12742 12900 13038 13092 13114 13483 13595 13717 13989 14070 14164 14176 14201 14606 14661 14680 14802 14805 14824 14864 15015 15027 15117 15319 15341 15370 15420 15473 15779 15916 16084 16091 16094 16234 16285 17527 17772 18814 19515 19573 19656 19745 19905 19974 20085 20214 20346 20372 20446 21369 21407 21714 21896 22055 22087 22119 22308 22387 22409 22520-22521 22606 22788-22789 22914 23090 23456 23600 23698 23709 23817 24082 24158 24188 24438 24499 24544 24574 25085 25196 25700 25797 25944 26078 26513 27107 27142 27974-27975 29550 29579 29585 29612 29636 29785 29811 29959 30201 30419 30543 30706 30813 30819 30969 30984 31028 31248 31261 31571 31599 31647 31879 31906 31917 31985 31998 32249 32365 32497 36800 448811.9867573869263685e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/160/252?format=asciiOpticalInfrareddefaultJ/AJ/160/252/table1The ZZ Ceti CandidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR2 identifiermeta.id;meta.mainprimaryRAJ2015[2.23/360] Right Ascension (J2015.5)degpos.eq.ra;meta.mainDEJ2015[-19.4/87.3] Declination (J2015.5)degpos.eq.dec;meta.mainplx[10/35.4] Parallaxmaspos.parallax.trigfloate_plx[0.02/0.5] Uncertainty in plxmasstat.error;pos.parallaxfloatpmRA[-261/248] Proper motion in RAmas/yrpos.pm;pos.eq.radoublee_pmRA[0.04/0.6] Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-335/199] Proper motion in DEmas/yrpos.pm;pos.eq.decdoublee_pmDE[0.04/0.5] Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatGmag[14.2/18.4] Gaia DR2 mean G band magnitudemagphot.mag;em.optfloatGbmag[14.1/18.3] Gaia DR2 blue passband magnitudemagphot.mag;em.opt.BfloatGrmag[14.2/18.3] Gaia DR2 red passband magnitudemagphot.mag;em.opt.Rfloatgmag[14.1/18.3] Pan-STARRS g band magnitudemagphot.mag;em.optfloate_gmag[0.003/18.3] Uncertainty in gmagmagstat.error;phot.magfloatrmag[14.3/18.4] Pan-STARRS r band magnitudemagphot.mag;em.opt.Rfloate_rmag[0/0.02] Uncertainty in rmagmagstat.error;phot.magfloatimag[14.5/18.6] Pan-STARRS i band magnitudemagphot.mag;em.opt.Ifloate_imag[0.001/0.07] Uncertainty in imagmagstat.error;phot.magfloatzmag[14.7/18.8] Pan-STARRS z band magnitudemagphot.mag;em.opt.Ifloate_zmag[0.001/0.02] Uncertainty in zmagmagstat.error;phot.magfloatymag[14.9/18.9] Pan-STARRS y band magnitudemagphot.mag;em.IR.Jfloate_ymag[0/0.07] Uncertainty in ymagmagstat.error;phot.magfloatuCmag[0/17.8] Canada-France Imaging Survey u band magnitudemagphot.mag;em.opt.Ufloate_uCmag[0/0.003] Uncertainty in umagmagstat.error;phot.magfloatuSmag[0/18.1] SDSS u band magnitudemagphot.mag;em.opt.Ufloate_uSmag[0/0.03] Uncertainty in uSmagmagstat.error;phot.magfloatpPulIndicate a possible pulsator if >0meta.numberintnullableNOVIndicate a NOV candidate if >0meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedJ/AJ/160/252/table3New ZZ Ceti white dwarfs and properties of possible pulsatorsl_FAP[<] Limite flag on FAPmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWhite dwarf identificationmeta.id.crosscharf_WD[*] Indicate a possible pulsator (5 occurrences)meta.codecharGaiaGaia DR2 identificationmeta.id;meta.mainRAJ2015[0/23] Hour of right ascension (J2015.5)pos.eq.ra;meta.mainDEJ2015Degree of declination (J2015.5)pos.eq.dec;meta.mainPer[102/1579] Dominant periodstime.periodintAmpl[0.2/38.5] Dominant amplitude%src.var.amplitude;arith.ratiofloate_Ampl[0.07/6.1] 5{sigma} error on Ampl%stat.errorfloatFAP[0.1/42] False alarm probability%statfloatTeff[10311/12513] Effective temperatureKphys.temperature.effectiveinte_Teff[39/206] Error in TeffKstat.error;phys.temperature.effectiveintMass[0.5/1.2] MasssolMassphys.massfloate_Mass[0.005/0.02] Error on MasssolMassstat.error;phys.massfloatGmag[15/17.8] Gaia G magnitudemagphot.mag;em.optfloatumag[16.4/17.4]? SDSS or CFIS u magnitudemagphot.mag;em.opt.Ufloatnullabler_umag[ab] Reference for umag (1)meta.ref;pos.framecharDArefLiterature identifying the object as a DAmeta.bibchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decnullableindexedJ/AJ/160/252/table4Non Observed to Vary (NOV) candidate propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWhite dwarf identificationmeta.id.crosscharGaiaGaia DR2 identificationmeta.id;meta.mainRAJ2015[0/23] Hour of right ascension (J2015.5)pos.eq.ra;meta.mainDEJ2015Degree of declination (J2015.5)pos.eq.dec;meta.mainPstripIndicating whether or not the object is located within the photometric instability stripmeta.codecharTeff[10416/13313] Effective temperatureKphys.temperature.effectiveinte_Teff[29/249] Error in TeffKstat.error;phys.temperature.effectiveintMass[0.45/1.21] MasssolMassphys.massfloate_Mass[0.004/0.02] Error on MasssolMassstat.error;phys.massfloatGmag[14.2/18.3] Gaia G magnitudemagphot.mag;em.opt.Vfloatumag[15.7/18]? SDSS or CFIS u magnitudemagphot.mag;em.opt.Ufloatnullabler_umagReference used for umag (1)meta.ref;pos.framecharPrec[0.6/7.8] Prercision%instr.precisionfloatDArefLiterature identifying the object as a DAmeta.bibchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decnullableindexedJ/AJ/160/252/refReferences usedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharAutorMain autor of the referenceobs.observercharBIBBIBcodemeta.bib.bibcodecharCat.Vizier catalogmeta.id;meta.tablechar