J/MNRAS/485/2380ivo://CDS.VizieR/J/MNRAS/485/2380doi:10.26093/cds/vizier.74852380CDSMurphy S.J.Hey D.Van Reeth T.Bedding T.R.2024-08-19T20:17:22Z2022-11-17T15:12:28ZCDS support team

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

cds-question@unistra.frasteroseismologyvisible-astronomytrigonometric-parallaxvariable-starsWe study the fraction of stars in and around the {delta} Scuti instability strip that are pulsating, using Gaia DR2 parallaxes to derive precise luminosities. We classify a sample of over 15000 Kepler A and F stars into {delta} Sct and non-{delta} Sct stars, paying close attention to variability that could have other origins. We find that 18 per cent of the {delta} Sct stars have their dominant frequency above the Kepler long-cadence Nyquist frequency (periods<1h), and 30 per cent have some super-Nyquist variability. We analyse the pulsator fraction as a function of effective temperature and luminosity, finding that many stars in the {delta} Sct instability strip do not pulsate. The pulsator fraction peaks at just over 70 per cent in the middle of the instability strip. The results are insensitive to the amplitude threshold used to identify the pulsators. We define a new empirical instability strip based on the observed pulsator fraction that is systematically hotter than theoretical strips currently in use. The stellar temperatures, luminosities, and pulsation classifications are provided in an online catalogue.2019MNRAS.485.2380Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/485/2380CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/485/2380https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/485/2380http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/485/2380https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/485/2380https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/485/2380http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/485/2380GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/485/2380/table1 (Stellar data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/485/2380/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/485/2380/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/485/2380/table1?GETtext/xml+votable180.050000true291.1269236.62186110.0055555555555555564/922-923 933-935 944-946 5/3645-3647 3683 3704 3706 3729-3731 3760 3788-3789 3792-3793 6/14559 14567 14573 14575 14577-14579 14730-14731 14738 14744 14746-14747 14749-14751 14792 14794-14795 14822 14828 14830-14831 14914-14915 15044-15045 15057 15059-15062 15160-15161 15176-15178 15200 152323.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/485/2380?format=asciiOpticaldefaultJ/MNRAS/485/2380/table1Stellar dataSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKIC name (NNNNNNNN)meta.id;meta.mainintGaiaDR2Gaia DR2 source namemeta.idgmagg-band SDSS magnitudemagphot.mag;em.opt.BfloatplxParallaxmaspos.parallax.trigfloate_plxError on plxmasstat.error;pos.parallaxfloatAgComputed extinction in the g-bandmagphys.absorptionfloate_AgError on Agmagstat.errorfloatTeffEffective temperatureKphys.temperature.effectiveinte_TeffError on TeffKstat.error;phys.temperature.effectiveint[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloate_[Fe/H]Error on [Fe/H]stat.error;phys.abund.Fefloatlogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Error on logglog(cm.s**-2)stat.errorfloatnullableRadStar radiussolRadphys.size.radiusfloate_RadError on RadsolRadstat.errorfloatMstarStar masssolMassphys.massfloate_MstarError on MstarsolMassstat.errorfloatq_Mstar[0/6] Quality flag on Mstar (1)meta.code.qualintlogLbolStar luminosity (2)log(solLum)phys.luminosityfloatE_logLbolUpper error on logLbollog(solLum)stat.error;stat.maxfloate_logLbolLower error on logLbollog(solLum)stat.errorfloatdSct[0/2] Indicates if the star is a {delta} Sct (3)meta.codeint_RAPositions from KIC (Cat. V/133) catalog (right ascension part)degpos.eq.ra;meta.mainindexed_DEPositions from KIC (Cat. V/133) catalog (declination part)degpos.eq.dec;meta.mainindexed