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

Abstract

The OI 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 OI lines, across the Stagger-grid of three-dimensional hydrodynamic model atmospheres. For the OI 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 OI616nm, [OI] 630 nm, [OI] 636 nm, and OI 777 nm lines, as well as abundance corrections to 1D LTE based results.

Accepted for publication in MNRAS; 19 pages, 10 figures, 6 tables

References in corpus (13)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The elemental composition of the Sun II. The iron group elements Sc to Ni
• Oxygen Abundances in Nearby Stars. Clues to the formation and evolution of the Galactic disk
• 3D Hydrodynamical Simulations of Surface Convection in Red Giant Stars. Impact on spectral line formation and abundance analysis
• HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang
• Carbon and oxygen abundances in stellar populations
• RH 1.5D: a massively parallel code for multi-level radiative transfer with partial frequency redistribution and Zeeman polarisation
• The photospheric solar oxygen project: IV. 3D-NLTE investigation of the 777 nm triplet lines
• The origin of the reversed granulation in the solar photosphere
• Carbon and Oxygen in Nearby Stars: Keys to Protoplanetary Disk Chemistry
• Electron-impact excitation of neutral oxygen
• The Galactic chemical evolution of oxygen inferred from 3D non-LTE spectral line formation calculations
• On line contribution functions and examining spectral line formation in 3D model stellar atmospheres

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