J/A+A/674/A157ivo://CDS.VizieR/J/A+A/674/A157CDSTsantaki M.Delgado-Mena E.Bossini D.Sousa S.G.Pancino E.,Martins J.H.C.2024-07-16T11:34:37Z2023-06-19T08:21:12ZCDS support team

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

cds-question@unistra.fropen-star-clustersgiant-starschemical-abundancesstellar-masseseffective-temperatureLithium-rich giant stars are rare and their existence challenges our understanding of stellar structure and evolution. We profit from the high-quality sample gathered to search for planets in open clusters with HARPS and UVES, in order to search for Li-rich giants and to identify the Li enrichment mechanisms responsible. We derive stellar parameters for 247 stars belonging to 32 open clusters, with 0.07Ga<ages<3.6Ga. We employed the spectral synthesis technique code FASMA for the abundance analysis of 228 stars from our sample. We also determined ages, distances, and extinction using astrometry and photometry from Gaia and PARSEC isochrones to constrain their evolutionary stage. We have found 14 canonical Li-rich giant stars which have experienced the first dredge-up. This corresponds to 6% of our total sample, which is higher than what is typically found for field stars. The majority of the stars (11/14) are located at the red clump, two lie on the red giant branch, and for one we could not conclude on its evolutionary stage. Apart from the canonical limit, we use the maximum Li abundance of the progenitor stars as a criterion for Li enrichment and find 12 Li enriched stars (5/12 appear in the red clump, 5/12 at the upper red giant branch and two we could not conclude on its evolutionary stage). We find Li enhancement also among eight stars which have passed the first dredge up and show strong Li lines based on the fact that stars at the same evolutionary stage in the same cluster have significantly different Li abundances. Our Li-rich giants are found in various evolutionary stages implying that no unique Li production mechanism is responsible for Li enrichment but rather different intrinsic or external mechanisms can be simultaneously at play.2023A&A...674A.157Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/674/A157CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/674/A157https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/674/A157http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/674/A157https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/674/A157https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/674/A157http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/674/A157GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/674/A157/tablea1 (Coordinates, V and G magnitudes, and Gaia ID)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/674/A157/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/674/A157/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/674/A157/tablea1?GETtext/xml+votable180.050000true169.37739583-62.707587780.0055555555555555566/4298 20796-20797 20903 21531 21538-21539 21586 21633 22130 22499 23410 23633 28818 29269 30215 30438-30439 30444-30445 31812 37349-37351 37745 37920 37933 37944 37971 38242 38248 38432 39350 39353 39356 39895 39901 39906 39912 39956 40104 40106 40690 40696 41834 42135 42153 42156 42210 42216 42274 42464 430221.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/674/A157?format=asciidefaultJ/A+A/674/A157/tablea1Coordinates, V and G magnitudes, and Gaia IDStarUnique star IDmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmag? V magnitudemagphot.mag;em.opt.VfloatnullableGmag? Gaia G magnitudemagphot.mag;em.optfloatnullableGaiaDR2? Gaia DR2 source IDmeta.idnullableNotesNotes (1)meta.notecharSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/A+A/674/A157/tablea2Parameters derived in this work from our spectroscopic analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarUnique star IDmeta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectivefloate_TeffError in Effective temperatureKstat.error;phys.temperature.effectivefloatloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggError in surface gravitylog(cm.s**-2)stat.errorfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]Error in metallicitystat.error;phys.abund.FefloatsnrSignal-to-noise ratiostat.snrintMass? MasssolMassphys.massfloatnullablee_Mass? Error in MasssolMassstat.error;phys.massfloatnullableLi? Li abundancephys.abundfloatnullablee_Li? Error in Li abundancestat.errorfloatnullableLiNLTE? Li abundance in NLTEphys.abundfloatnullableJ/A+A/674/A157/tablea3Parameters calculated with methods other than spectroscopyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarUnique star IDmeta.id;meta.maincharTeffPhot? Effective temperature (photometry)Kphys.temperature.effectivefloatnullablee_TeffPhot? Error in Effective temperature (photometry)Kstat.errorfloatnullableloggTrig? Surface gravity (spectro-photometry)log(cm.s**-2)phys.gravityfloatnullablee_loggTrig? Error in surface gravity (spectro-photometry)log(cm.s**-2)stat.errorfloatnullableMassPhot? Mass (spectro-photometry)solMassphys.massfloatnullablee_MassPhot? Error in Mass (spectro-photometry)solMassstat.errorfloatnullableLiPhot? Li abundance (spectro-photometry)phys.abundfloatnullablee_LiPhot? Error in Li abundance (spectro-photometry)stat.errorfloatnullableLiNLTEPhot? Li abundance in NLTE (spectro-photometry)phys.abundfloatnullable