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J/A+A/546/A90       NLTE analysis of Sr lines                (Bergemann+, 2012)
NLTE analysis of Sr lines in spectra of late-type stars with new R-matrix atomic
data.
    Bergemann M., Hansen C.J., Bautista M., Ruchti G.
    <Astron. Astrophys. 546, A90 (2012)>
    =2012A&A...546A..90B        (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics

Keywords: atomic data - line: formation - radiative transfer - Sun: abundances -
          stars: abundances - stars: atmospheres

Abstract:
    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 SrI and
    SrII 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 0.5dex. The solar Sr abundance is
    log(epsilon)=2.93±0.04dex, in agreement with the meteorites. We
    present the grid of NLTE abundance corrections for SrI and SrII
    lines that covers a wide range of stellar parameters.

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  *    The publication of the data will only be postponed until the        *
  *                    accompanying paper is published                     *
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Author's address:
    M. Bergemann, mbergema(at)mpa-garching.mpg.de
(End)                                      Patricia Vannier [CDS]    12-Oct-2012