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

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• 作者：L. I. Mashonkina ; T. N. Sitnova ; Yu. V. Pakhomov
• 关键词：stellar atmosphere ; spectral line formation ; calcium ; titanium ; and iron abundance determinations in stars
• 刊名：Astronomy Letters
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：42
• 期：9
• 页码：606-615
• 全文大小：1,475 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  Astrophysics
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-6873
• 卷排序：42

文摘

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.