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arxiv: 1207.2451 · v1 · pith:WNYPJ4HCnew · submitted 2012-07-10 · 🌌 astro-ph.SR

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

M. Bergemann , C. J. Hansen , M. Bautista , G. Ruchti This is my paper
classification 🌌 astro-ph.SR
keywords abundancelinesnlteanalysislate-typemodelr-matrixspectra
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We investigate 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 A = 2.93 \pm 0.04 dex, in agreement with the meteorites. A grid of NLTE abundance corrections for Sr I and Sr II lines covering a large range of stellar parameters is presented.

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