J/MNRAS/475/5487ivo://CDS.VizieR/J/MNRAS/475/5487doi:10.26093/cds/vizier.74755487CDSSilva Aguirre V.Bojsen-Hansen M.Slumstrup D.Casagrande L.Kawata D.,Ciuca I.Handberg R.Lund M.N.Mosumgaard J.R.Huber D.Johnson J.A.,Pinsonneault M.H.Serenelli A.M.Stello D.Tayar J.Bird J.C.,Cassisi S.Hon M.Martig M.Nissen P.E.Rix H.W.Schonrich R.,Sahlholdt C.Trick W.H.Yu J.2024-08-18T20:18:16Z2021-05-05T11:20:03ZCDS support team

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

cds-question@unistra.frgiant-starsstellar-massesstellar-radiistellar-agesstellar-distanceInvestigations of the origin and evolution of the Milky Way disc have long relied on chemical and kinematic identifications of its components to reconstruct our Galactic past. Difficulties in determining precise stellar ages have restricted most studies to small samples, normally confined to the solar neighbourhood. Here, we break this impasse with the help of asteroseismic inference and perform a chronology of the evolution of the disc throughout the age of the Galaxy. We chemically dissect the Milky Way disc population using a sample of red giant stars spanning out to 2 kpc in the solar annulus observed by the Kepler satellite, with the added dimension of asteroseismic ages. Our results reveal a clear difference in age between the low- and high-{alpha} populations, which also show distinct velocity dispersions in the V and W components. We find no tight correlation between age and metallicity nor [{alpha}/Fe] for the high-{alpha} disc stars. Our results indicate that this component formed over a period of more than 2 Gyr with a wide range of [M/H] and [{alpha}/Fe] independent of time. Our findings show that the kinematic properties of young {alpha}-rich stars are consistent with the rest of the high-{alpha} population and different from the low-{alpha} stars of similar age, rendering support to their origin being old stars that went through a mass transfer or stellar merger event, making them appear younger, instead of migration of truly young stars formed close to the Galactic bar.2018MNRAS.475.5487Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/475/5487CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/MNRAS/452/2127 : Fundamental parameters of Kepler starsJ/ApJ/835/173 : Kepler asteroseismic LEGACY sample. II.https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/475/5487https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/475/5487http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/475/5487https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/475/5487https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/475/5487http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/475/5487GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/475/5487/table1 (Stellar properties determined with BASTA for the APOKASC sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/475/5487/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/475/5487/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/475/5487/table1?GETtext/xml+votable180.050000true284.657624448.38036940.0055555555555555565/3645-3646 3688 3695 3706 3730-3731 3736-3737 3740-3742 3779-3782 3784-3785 3792 6/14567 14573 14578-14579 14588-14589 14730-14731 14760 14767 14775 14777-14779 14818-14819 14822 14828 14830 14914-14916 14918-14919 14937-14940 14942-14943 14952-14953 14956 14972-14974 15109 15111 15114-15115 15132-15134 15145 15147-15150 15154 15160 15172-15174 15176https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/475/5487?format=asciidefaultJ/MNRAS/475/5487/table1Stellar properties determined with BASTA for the APOKASC sampleKICKepler Input Catalogue Identifiermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMassMasssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatRadRadiussolRadphys.size.radiusfloate_Radrms uncertainty on RadsolRadstat.errorfloatloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloatAgeAgeGyrtime.agefloate_Agerms uncertainty on AgeGyrstat.error;time.agefloatLumLuminositysolLumphys.luminosityfloate_Lumrms uncertainty on LumsolLumstat.errorfloatDistDistancepcpos.distancefloate_Distrms uncertainty on Distpcstat.errorfloatProbTarget selection probabilitystat.probabilitydoubleSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main