The Gaia-ESO Survey: Oxygen Abundance in the Galactic Thin and Thick Disks

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dc.contributor.authorFranchini, Mariagrazia
dc.contributor.authorMorossi, Carlo
dc.contributor.authorDi Marcantonio, Paolo
dc.contributor.authorChavez, Miguel
dc.contributor.authorAdibekyan, Vardan
dc.contributor.authorBensby, Thomas
dc.contributor.authorBragaglia, Angela
dc.contributor.authorGonneau, Anais
dc.contributor.authorHeiter, Ulrike
dc.contributor.authorKordopatis, Georges
dc.contributor.authorMagrini, Laura
dc.contributor.authorRomano, Donatella
dc.contributor.authorSbordone, Luca
dc.contributor.authorSmiljanic, Rodolfo
dc.contributor.authorTautvaišienė, Gražina
dc.contributor.authorGilmore, Gerry
dc.contributor.authorRandich, Sofia
dc.contributor.authorBayo, Amelia
dc.contributor.authorCarraro, Giovanni
dc.contributor.authorMorbidelli, Lorenzo
dc.contributor.authorZaggia, Simone
dc.date.accessioned2022-11-30T02:46:21Z
dc.date.available2022-11-30T02:46:21Z
dc.date.issued2021
dc.description.abstractWe analyze the oxygen abundances of a stellar sample representative of the two major Galactic populations: the thin and thick disks. The aim is to investigate the differences between members of the Galactic disks and contribute to the understanding of the origin of oxygen chemical enrichment in the Galaxy. The analysis is based on the [O i] = 6300.30 Å oxygen line in high-resolution spectra (R ∼ 52,500) obtained from the Gaia-ESO public spectroscopic Survey (GES). By comparing the observed spectra with a theoretical data set computed in LTE with the SPECTRUM synthesis and ATLAS12 codes, we derive the oxygen abundances of 516 FGK dwarfs for which we have previously measured carbon abundances. Based on kinematic, chemical, and dynamical considerations, we identify 20 thin and 365 thick disk members. We study the potential trends of both subsamples in terms of their chemistry ([O/H], [O/Fe], [O/Mg], and [C/O] versus [Fe/H] and [Mg/H]), age, and position in the Galaxy. The main results are that (a) [O/H] and [O/Fe] ratios versus [Fe/H] show systematic differences between thin and thick disk stars with an enhanced O abundance of thick disk stars with respect to thin disk members and a monotonic decrement of [O/Fe] with increasing metallicity, even at metal-rich regime; (b) there is a smooth correlation of [O/Mg] with age in both populations, suggesting that this abundance ratio can be a good proxy of stellar ages within the Milky Way; and (c) thin disk members with [Fe/H] ≃ 0 display a [C/O] ratio smaller than the solar value, suggesting a possibly outward migration of the Sun from lower Galactocentric radii.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.file.nameFranchini_Gai2021.pdf
dc.identifier.doihttps://doi.org/10.3847/1538-3881/abc69b
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/7330
dc.languageen
dc.publisherAmerican Astronomical Society (Aas)
dc.rights© 2020. The American Astronomical Society. All rights reserved.
dc.sourceThe Astronomical Journal
dc.subjectLATE-TYPE STARSen_ES
dc.subjectSTELLAR ABUNDANCESen_ES
dc.subjectSTELLAR AGESen_ES
dc.subjectMILKY WAY DISKen_ES
dc.titleThe Gaia-ESO Survey: Oxygen Abundance in the Galactic Thin and Thick Disks
dc.typeArticulo
uv.departamentoInstituto de Fisica y Astronomia

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