NLTE analysis of Sr lines in spectra of late-type stars with new R-matrix atomic data

被引：79

作者：

Bergemann, M. ^{[1
]}

Hansen, C. J. ^{[2
]}

Bautista, M. ^{[3
]}

Ruchti, G. ^{[1
]}

机构：

[1] Max Planck Inst Astrophys, D-85741 Garching, Germany

[2] Landessternwarte Konigstuhl, D-69117 Heidelberg, Germany

[3] Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 546卷

关键词：

atomic data; line: formation; radiative transfer; Sun: abundances; stars: abundances; stars: atmospheres; MULTILEVEL RADIATIVE-TRANSFER; SAMPLING MODEL ATMOSPHERES; LAMBDA ITERATION METHOD; METAL-POOR STARS; COOL STARS; PROCESS NUCLEOSYNTHESIS; CHEMICAL-COMPOSITION; MAFAGS-OS; ABUNDANCES; MG;

D O I：

10.1051/0004-6361/201219406

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the statistical equilibrium of neutral and singly-ionized strontium in late-type stellar atmospheres. Particular attention is given to the completeness of the model atom, which includes new energy levels, transition probabilities, photoionization and electron-impact excitation cross-sections computed with the R-matrix method. The NLTE model is applied to the analysis of Sr I and Sr II lines in the spectra of the Sun, Procyon, Arcturus, and HD 122563, showing a significant improvement in the ionization balance compared to LTE line formation calculations, which predict abundance discrepancies of up to 0.5 dex. The solar Sr abundance is log epsilon = 2.93 +/- 0.04 dex, in agreement with the meteorites. We present the grid of NLTE abundance corrections for Sr I and Sr II lines that covers a wide range of stellar parameters.

引用

页数：12

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