Non-LTE oxygen line formation in 3D hydrodynamic model stellar atmospheres

A. M. Amarsi*, M. Asplund, R. Collet, J. Leenaarts

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    100 Citations (Scopus)

    Abstract

    The O I 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 I 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 I 616 nm, [O I] 630 nm, [O I] 636 nm, and O I 777 nm lines, as well as abundance corrections to 1D LTE based results.

    Original languageEnglish
    Pages (from-to)3735-3751
    Number of pages17
    JournalMonthly Notices of the Royal Astronomical Society
    Volume455
    Issue number4
    DOIs
    Publication statusPublished - 1 Feb 2016

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