J/A+A/594/A120ivo://CDS.VizieR/J/A+A/594/A120doi:10.26093/cds/vizier.35940120CDSBergemann M.Serenelli A.Schonrich R.Ruchti G.Korn A.Hekker S.,Kovalev M.Mashonkina L.Gilmore G.Randich S.Asplund M.Rix H.-W.,Casey A.R.Jofre P.Pancino E.Recio-Blanco A.De Laverny P.,Smiljanic R.Tautvaisiene G.Bayo A.Lewis J.Koposov S.Hourihane A.,Worley C.Morbidelli L.Franciosini E.Sacco G.Magrini L.Damiani F.,Bestenlehner J.M.2024-03-01T13:45:20Z2017-02-17T09:05:55ZCDS support team

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

cds-question@unistra.frmilky-way-galaxygiant-starsvisible-astronomyh-alpha-photometryRed giant stars are perhaps the most important type of stars for Galactic and extra-galactic archaeology: they are luminous, occur in all stellar populations, and their surface temperatures allow precise abundance determinations for many different chemical elements. Yet, the full star formation and enrichment history of a galaxy can be traced directly only if two key observables can be determined for large stellar samples: age and chemical composition. While spectroscopy is a powerful method to analyse the detailed abundances of stars, stellar ages are the missing link in the chain, since they are not a direct observable. However, spectroscopy should be able to estimate stellar masses, which for red giants directly infer ages provided their chemical composition is known. Here we establish a new empirical relation between the shape of the hydrogen line in the observed spectra of red giants and stellar mass determined from asteroseismology. The relation allows determining stellar masses and ages with an accuracy of 10-15%. The method can be used with confidence for stars in the following range of stellar parameters: 4000<T_eff_<5000K, 0.5<logg<3.5, -2.0<[Fe/H]<0.3, and luminosities logL/L_{sun}_<2.5. Our analysis provides observational evidence that the H_{alpha}_ spectral characteristics of red giant stars are tightly correlated with their mass and therefore their age. We also show that the method samples well all stellar populations with ages above 1Gyr. Targeting bright giants, the method allows obtaining simultaneous age and chemical abundance information far deeper than would be possible with asteroseismology, extending the possible survey volume to remote regions of the Milky Way and even to neighbouring galaxies such as Andromeda or the Magellanic Clouds even with current instrumentation, such as the VLT and Keck facilities.2016A&A...594A.120Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/594/A120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/543/A160 : Normalized spectra of 82 Kepler red giants (Thygesen+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/594/A120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/594/A120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/594/A120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/594/A120https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/594/A120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/594/A120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/594/A120/tablea12 (Observational data (table A1) and stellar parameters and Halpha measurements (table A2) for Gaia-ESO stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/594/A120/tablea12?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/594/A120/tablea12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/594/A120/tablea12?GETtext/xml+votable180.050000true291.32691670.28194440.005555555555555556Cone search capability for table J/A+A/594/A120/tablea34 (Observational data (table A3) and stellar parameters and Halpha measurements (table A4) for Gaia-ESO stars in clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/594/A120/tablea34?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/594/A120/tablea34?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/594/A120/tablea34?GETtext/xml+votable180.050000true132.784916711.78669440.005555555555555556Cone search capability for table J/A+A/594/A120/tablea5 (Stellar parameters and Halpha measurements for the Kepler stars from Thygesen et al. (2012, Cat. J/A+A/543/A160))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/594/A120/tablea5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/594/A120/tablea5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/594/A120/tablea5?GETtext/xml+votable180.050000true287.073849737.76294060.0055555555555555565/3646 6/4298 14589 14591 14730-14731 14746 14752-14754 14762 14765 14779 14825 14915 14918 14931-14933 14936-14937 14942 14948 14954 14956 14959 14964-14965 14975 15040 15044 15060 15128-15129 15148 15153-15154 20562 30293 30295 30301 30464 30472 34242-34243 37294 37636 41507 41852 47125 47168https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/594/A120?format=asciiOpticaldefaultJ/A+A/594/A120/tablea12Observational data (table A1) and stellar parameters and Halpha measurements (table A2) for Gaia-ESO starsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCoRoTCoRoT IDmeta.idlongGESGaia-ESO ID, HHMMSSss+DDMMSSsmeta.id;meta.maincharS/NSignal-to-noise ratiostat.snrintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainRVRadial velocitykm/sphys.veloc;pos.heliocentricintWHalphaHalpha equivalent width0.1nmspect.line.eqWidthfloatf0Line depth parameter0.1nmphys.absorption.opticalDepth;spect.linefloatAgeAgeGyrtime.agefloate_Agerms uncertainty on AgeGyrstat.error;time.agefloatMassMasssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.error;phys.massfloatTeffEffective temperatureKphys.temperature.effectiveinte_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveintloggSurface gravity (1)log(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H]stat.error;phys.abund.FefloatlogLLuminositylog(solLum)phys.luminosityfloatJ/A+A/594/A120/tablea34Observational data (table A3) and stellar parameters and Halpha measurements (table A4) for Gaia-ESO stars in clustersf0Line depth parameter0.1nmphys.absorption.opticalDepth;spect.linefloatTeffEffective 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.errorfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H]stat.error;phys.abund.FefloatSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id.parentcharGESGaia-ESO ID, HHMMSSss+DDMMSSsmeta.id;meta.maincharS/NSignal-to-noise ratiostat.snrintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainRVRadial velocitykm/sphys.veloc;pos.heliocentricintWHalphaHalpha equivalent width0.1nmspect.line.eqWidthfloatJ/A+A/594/A120/tablea5Stellar parameters and Halpha measurements for the Kepler stars from Thygesen et al. (2012, Cat. J/A+A/543/A160)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKepler IDmeta.id;meta.mainintn_KIC[*] Note on KIC (1)meta.notecharWHalphaHalpha equivalent width0.1nmspect.line.eqWidthfloatf0Line depth parameter0.1nmphys.absorption.opticalDepth;spect.linefloatAge? AgeGyrtime.agefloatnullablee_Age? rms uncertainty on AgeGyrstat.error;time.agefloatnullableMassMasssolMassphys.massfloatSimbadSimbad column added by the CDSmeta.ref.urlchare_Massrms uncertainty on MasssolMassstat.error;phys.massfloatTeffEffective temperatureKphys.temperature.effectiveinte_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveintloggSurface gravity (2)log(cm.s**-2)phys.gravityfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H]stat.error;phys.abund.FefloatlogL? Luminositylog(solLum)phys.luminosityfloatnullableTypeType (RGB or RC)src.classchar_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