Influence of departures from LTE on calcium, titanium, and iron abundance determinations in cool giants of different metallicities

We have performed statistical equilibrium calculations for Ca I–Ca II, Ti I–Ti II, and Fe I–Fe II by taking into account the nonequilibrium line formation conditions (the non-LTE approach) in model atmospheres of giant stars with effective temperatures 4000 K ≤ T eff ≤ 5000 K and metal abundances −4...

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Bibliographic Details
Published in:Astronomy letters 2016-09, Vol.42 (9), p.606-615
Main Authors: Mashonkina, L. I., Sitnova, T. N., Pakhomov, Yu. V.
Format: Article
Language:English
Subjects:
Abundance
Astronomy
Astrophysics and Astroparticles
Atmospherics
Calcium
Heavy metal content
Interpolation
Iron
Mathematical models
Observations and Techniques
Parameters
Physics
Physics and Astronomy
Star & galaxy formation
Stars & galaxies
Titanium
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Summary:We have performed statistical equilibrium calculations for Ca I–Ca II, Ti I–Ti II, and Fe I–Fe II by taking into account the nonequilibrium line formation conditions (the non-LTE approach) in model atmospheres of giant stars with effective temperatures 4000 K ≤ T eff ≤ 5000 K and metal abundances −4 ≤ [Fe/H] ≤ 0. The dependence of departures from LTE on atmospheric parameters has been analyzed. We present the non-LTE abundance corrections for 28 Ca I lines, 42 Ti I lines, 54 Ti II lines, and 262 Fe I lines and a three-dimensional interpolation code to obtain the non-LTE correction online for an individual line and specified atmospheric parameters.
ISSN:1063-7737
1562-6873
DOI:10.1134/S1063773716080028