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

Franchini, Mariagrazia ; Morossi, Carlo ; Di Marcantonio, Paolo ; Chavez, Miguel ; Adibekyan, Vardan ; Bensby, Thomas LU orcid ; Bragaglia, Angela ; Gonneau, Anais ; Heiter, Ulrike and Kordopatis, Georges , et al. (2021) In The Astronomical Journal 161(1).
Abstract

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 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... (More)

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 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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Astronomical Journal
volume
161
issue
1
article number
9
publisher
IOP Publishing
external identifiers
  • scopus:85104066986
ISSN
1538-3881
DOI
10.3847/1538-3881/abc69b
language
English
LU publication?
yes
id
28c880e2-da3c-4e30-b931-8217a714322e
date added to LUP
2022-10-27 10:20:28
date last changed
2024-04-18 16:02:33
@article{28c880e2-da3c-4e30-b931-8217a714322e,
  abstract     = {{<p>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 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.</p>}},
  author       = {{Franchini, Mariagrazia and Morossi, Carlo and Di Marcantonio, Paolo and Chavez, Miguel and Adibekyan, Vardan and Bensby, Thomas and Bragaglia, Angela and Gonneau, Anais and Heiter, Ulrike and Kordopatis, Georges and Magrini, Laura and Romano, Donatella and Sbordone, Luca and Smiljanic, Rodolfo and Tautvaišienė, Gražina and Gilmore, Gerry and Randich, Sofia and Bayo, Amelia and Carraro, Giovanni and Morbidelli, Lorenzo and Zaggia, Simone}},
  issn         = {{1538-3881}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{1}},
  publisher    = {{IOP Publishing}},
  series       = {{The Astronomical Journal}},
  title        = {{The Gaia-ESO Survey : Oxygen Abundance in the Galactic Thin and Thick Disks}},
  url          = {{http://dx.doi.org/10.3847/1538-3881/abc69b}},
  doi          = {{10.3847/1538-3881/abc69b}},
  volume       = {{161}},
  year         = {{2021}},
}