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

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

Franchini, Mariagrazia (författare): INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy.,INAF Astronomical Observatory of Trieste

Morossi, Carlo (författare): INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy.,INAF Astronomical Observatory of Trieste

Di Marcantonio, Paolo (författare): INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy.,INAF Astronomical Observatory of Trieste

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Chavez, Miguel (författare): Inst Nacl Astrofis Opt & Electr, Luis Enrique Erro 1, Puebla 72840, Mexico.,National Institute Of Astrophysics, Optics And Electronics (INAOE)

Adibekyan, Vardan (författare): Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, Rua Estrelas, P-4150762 Porto, Portugal.;Univ Porto, Dept Fis & Astron, Fac Ciencias, Rua Campo Alegre, P-4169007 Porto, Portugal.,University of Porto

Bensby, Thomas (författare): Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science

Bragaglia, Angela (författare): INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy.,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

Gonneau, Anais (författare): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.,University of Cambridge

Heiter, Ulrike (författare): Uppsala University,Uppsala universitet,Institutionen för fysik och astronomi

Kordopatis, Georges (författare): Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS UMR 7293, CS 34229, F-06304 Nice 04, France.,Côte d'Azur Observatory

Magrini, Laura (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Romano, Donatella (författare): INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy.,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

Sbordone, Luca (författare): European Southern Observ, Vitacura 3107, Santiago De Chi, Chile.,European Southern Observatory Santiago

Smiljanic, Rodolfo (författare): Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland.,Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences

Tautvaisiene, Grazina (författare): Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10258 Vilnius, Lithuania.,Vilnius University

Gilmore, Gerry (författare): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.,University of Cambridge

Randich, Sofia (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Bayo, Amelia (författare): Univ Valparaiso, Inst Fis & Astron, Avda Gran Bretana 1111, Valparaiso, Chile.;Univ Valparaiso, Nucleo Milenio Formac Planetaria, NPF, Valparaiso, Chile.,University of Valparaíso

Carraro, Giovanni (författare): Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.,University of Padova

Morbidelli, Lorenzo (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Zaggia, Simone (författare): INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.,INAF - Osservatorio Astronomico di Padova

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INAF Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy INAF Astronomical Observatory of Trieste (creator_code:org_t)

2020-12-02
2021
Engelska.
Ingår i: Astronomical Journal. - : Institute of Physics Publishing (IOPP). - 0004-6256 .- 1538-3881. ; 161:1

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We 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 A oxygen line in high-resolution spectra (R similar to 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.

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

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