EAS Publications Series
Volume 43, 2010Non-LTE Line Formation for Trace Elements in Stellar Atmospheres
|Page(s)||223 - 229|
|Published online||16 November 2010|
R. Monier, B. Smalley, G. Wahlgren and Ph. Stee (eds)
EAS Publications Series, 43 (2010) 223-229
Departures from LTE in Cool Stars
Institute of Astronomy, Russian
Academy of Science, Pyatnitskaya
Departures from LTE may significantly affect determinations of stellar parameters and chemical abundances of cool stars, in particular, metal-poor stars. We review the application of the non-LTE ionization equilibrium between Ca i and Ca ii to constrain the surface gravity of very metal-poor and hyper metal-poor stars spectroscopically. The few examples from Galactic chemical evolution studies show that our understanding of how nucleosynthesis proceeds throughout Galactic history depends on the accuracy of spectral line formation modelling. Problems of non-LTE modelling of Fe i– Fe ii are also discussed.
© EAS, EDP Sciences 2010
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