J/A+A/645/A85ivo://CDS.VizieR/J/A+A/645/A85doi:10.26093/cds/vizier.36450085CDSMiglio A.Chiappini C.Mackereth T.Davies G.Brogaard K.,Casagrande L.Chaplin B.Girardi L.Kawata D.Khan S.Izzard R.,Montalban J.Mosser B.Vincenzo F.Bossini D.Noels A.Rodrigues T.,Valentini M.Mandel I.2023-05-05T10:06:14Z2021-01-19T07:16:05ZCDS support team

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

cds-question@unistra.frmilky-way-galaxylate-type-starsstellar-agesstellar-massesstellar-distanceEnsemble studies of red-giant stars with exquisite asteroseismic (Kepler), spectroscopic (APOGEE), and astrometric (Gaia) constraints offer a novel opportunity to recast and address long-standing questions concerning the evolution of stars and of the Galaxy. Here, we infer masses and ages for nearly 5400 giants with available Kepler light curves and APOGEE spectra using the code PARAM, and discuss some of the systematics that may affect the accuracy of the inferred stellar properties. We then present patterns in mass, evolutionary state, age, chemical abundance, and orbital parameters that we deem robust against the systematic uncertainties explored. First, we look at age-chemical-abundances ([Fe/H] and [alpha/Fe]) relations. We find a dearth of young, metal-rich ([Fe/H]>0.2) stars, and the existence of a significant population of old (8-9Gyr), low-[alpha/Fe], super-solar metallicity stars, reminiscent of the age and metallicity of the well-studied open cluster NGC 6791. The age-chemo-kinematic properties of these stars indicate that efficient radial migration happens in the thin disc. We find that ages and masses of the nearly 400 alpha-element-rich red-giant-branch (RGB) stars in our sample are compatible with those of an old (~11Gyr), nearly coeval, chemical-thick disc population. Using a statistical model, we show that the width of the observed age distribution is dominated by the random uncertainties on age, and that the spread of the inferred intrinsic age distribution is such that 95% of the population was born within ~1.5Gyr. Moreover, we find a difference in the vertical velocity dispersion between low- and high-[alpha/Fe] populations. This discontinuity, together with the chemical one in the [alpha/Fe] versus [Fe/H] diagram, and with the inferred age distributions, not only confirms the different chemo-dynamical histories of the chemical-thick and thin discs, but it is also suggestive of a halt in the star formation (quenching) after the formation of the chemical-thick disc. We then exploit the almost coeval alpha-rich population to gain insight into processes that may have altered the mass of a star along its evolution, which are key to improving the mapping of the current, observed, stellar mass to the initial mass and thus to the age. Comparing the mass distribution of stars on the lower RGB (R<11R_{sun}_) with those in the red clump (RC), we find evidence for a mean integrated RGB mass loss DM=0.10+/-0.02M_{sun}_. Finally, we find that the occurrence of massive (M>~1.1M_{sun}_) alpha-rich stars is of the order of 5% on the RGB, and significantly higher in the RC, supporting the scenario in which most of these stars had undergone an interaction with a companion.2021A&A...645A..85Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/645/A85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/645/A85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/645/A85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/645/A85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/645/A85https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/645/A85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/645/A85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/645/A85/catalog (Catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/645/A85/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/645/A85/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/645/A85/catalog?GETtext/xml+votable180.050000true290.621666737.17458330.0055555555555555564/922-923 933-935 944-946 5/3645-3647 3683 3704 3706 3729-3731 3760 3788-3789 3792 6/14559 14567 14573 14575 14577-14579 14730-14731 14744 14746 14749-14751 14792 14794-14795 14822 14828 14830-14831 14914-14915 15044-15045 15057 15059-15062 15160 15172-15174 15200 152328.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/645/A85?format=asciidefaultJ/A+A/645/A85/catalogCatalogEccOrbit eccentricity in MWPotential2014src.orbital.eccentricityfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPOGEEAPOGEE ID in DR14 (2MHHMMSSss+DDMMSSs)meta.id;meta.maincharKICKepler Input Catalogue IDmeta.idintJmag2MASS J-band magnitudemagphot.mag;em.IR.JfloatHmag2MASS H-band magnitudemagphot.mag;em.IR.HfloatKsmag2MASS Ks-band magnitudemagphot.mag;em.IR.KfloatRAdegRight Ascension (J2000)degpos.eq.raDEdegDeclination (J2000)degpos.eq.dec[Fe/H]APOGEE [Fe/H] (DR14)phys.abund.Fefloat[alpha/M]APOGEE [alpha/M] (DR14)phys.abundfloatAge? Age from PARAM (R1)Gyrtime.agefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharb_Age? Age 18th percentileGyrtime.agefloatnullableB_Age? Age 84th percentileGyrtime.agefloatnullableMassMass from PARAM (R1)solMassphys.massfloatb_MassMass 18th percentilesolMassphys.massfloatB_MassMass 84th percentilesolMassphys.massfloatRadRadius from PARAM (R1)solRadphys.size.radiusfloatb_RadRadius 18th percentilesolRadphys.size.radiusfloatB_RadRadius 84th percentilesolRadphys.size.radiusfloatDist? Distance from PARAM (R1)kpcpos.distancefloatnullableb_Dist? Distance 18th percentilekpcpos.distancefloatnullableB_Dist? Distance 84th percentilekpcpos.distancefloatnullableAv? Extinction from PARAM (R1)magphys.absorptionfloatnullableb_Av? Extinction 18th percentilemagphys.absorptionfloatnullableB_Av? Extinction 84th percentilemagphys.absorptionfloatnullableevstate[1/2] Evolutionary state from Yu et al. (2018, Cat. J/ApJS/236/42) (1)meta.codeintzmaxMaximum vertical excursion in MWPotential2014kpcpos.cartesian.z;pos.galacticfloate_zmaxMaximum vertical excursion: 1 sigma errorkpcstat.errorfloate_EccOrbit eccentricity: 1 sigma errorstat.errorfloatRperiPericentre radius in MWPotential2014kpcphys.size.radiusfloate_RperiPericentre radius: 1 sigma errorkpcstat.errorfloatRapApocentre radius in MWPotential2014kpcphys.size.radiusfloate_RapApocentre radius: 1 sigma errorkpcstat.errorfloatGalRPosition Galactocentric cylindrical coordinates: Galactocentric radiuskpcpos.distance;phys.size.radius;pos.galactocentricfloatGalphiPosition: azimuthradposfloatGalZPosition: height above the Galactic midplanekpcpos.cartesian.z;pos.galacticfloatvRGalactocentric radial velocitykm/sspect.dopplerVeloc;pos.galactocentricfloatvTGalactocentric tangential velocitykm/sphys.velocfloatvZGalactocentric vertical velocitykm/sphys.veloc;pos.galactocentricfloat_RAPosition from APOGEE name (right ascension part)degpos.eq.ra;meta.main_DEPosition from APOGEE name (declination part)degpos.eq.dec;meta.main