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The Galactic chemical evolution of oxygen inferred from 3D non-LTE spectral-line-formation calculations
Stockholm University, Faculty of Science, Department of Astronomy.
Number of Authors: 4
2015 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 454, no 1, L11-L15 p.Article in journal (Refereed) Published
Abstract [en]

We revisit the Galactic chemical evolution of oxygen, addressing the systematic errors inherent in classical determinations of the oxygen abundance that arise from the use of one-dimensional (1D) hydrostatic model atmospheres and from the assumption of local thermodynamic equilibrium (LTE). We perform detailed 3D non-LTE radiative-transfer calculations for atomic oxygen lines across a grid of 3D hydrodynamic STAGGER model atmospheres for dwarfs and subgiants. We apply our grid of predicted line strengths of the [O I] 630 nm and O I 777 nm lines using accurate stellar parameters from the literature. We infer a steep decay in [O/Fe] for [Fe/H] greater than or similar to -1.0, a plateau [O/Fe] approximate to 0.5 down to [Fe/H] approximate to -2.5, and an increasing trend for [Fe/H] less than or similar to -2.5. Our 3D non-LTE calculations yield overall concordant results from the two oxygen abundance diagnostics.

Place, publisher, year, edition, pages
2015. Vol. 454, no 1, L11-L15 p.
Keyword [en]
line: formation, radiative transfer, methods: numerical, stars: abundances, stars: atmospheres, Galaxy: abundances
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-132627DOI: 10.1093/mnrasl/slv122ISI: 000378922200002OAI: diva2:954623
Available from: 2016-08-23 Created: 2016-08-17 Last updated: 2016-08-23Bibliographically approved

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Leenaarts, Jorrit
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