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Non-LTE oxygen line formation in 3D hydrodynamic model stellar atmospheres
Stockholm University, Faculty of Science, Department of Astronomy.
Number of Authors: 4
2016 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 455, no 4, 3735-3751 p.Article in journal (Refereed) Published
Abstract [en]

The O (Iota) 777 nm lines are among the most commonly used diagnostics for the oxygen abundances in the atmospheres of FGK-type stars. However, they form in conditions that are far from local thermodynamic equilibrium (LTE). We explore the departures from LTE of atomic oxygen, and their impact on O I lines, across the STAGGER-grid of three-dimensional hydrodynamic model atmospheres. For the O (Iota) 777 nm triplet, we find significant departures from LTE. These departures are larger in stars with larger effective temperatures, smaller surface gravities, and larger oxygen abundances. We present grids of predicted 3D non-LTE based equivalent widths for the O (Iota) 616 nm, [O (Iota)] 630 nm, [O (I)] 636 nm, and O (Iota) 777 nm lines, as well as abundance corrections to 1D LTE based results.

Place, publisher, year, edition, pages
2016. Vol. 455, no 4, 3735-3751 p.
Keyword [en]
line: formation, radiative transfer, methods: numerical, stars: abundances, stars: atmospheres
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-126886DOI: 10.1093/mnras/stv2608ISI: 000368009300026OAI: diva2:905233
Available from: 2016-02-22 Created: 2016-02-16 Last updated: 2016-02-22Bibliographically approved

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Leenaarts, Jorrit
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ReferencesLink to record
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