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 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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Author's address:
M. Bergemann, mbergema(at)mpa-garching.mpg.de
(End) Patricia Vannier [CDS] 12-Oct-2012