Departures from LTE in Cool Stars

Details Departures from LTE in Cool Stars Departures from LTE in Cool Stars

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010eas....43..223m&link_type=abstract

EAS Publications Series, Volume 43, 2010, Non-LTE Line Formation for Trace Elements in Stellar Atmospheres, Edited by R. Monier,

Physics

Scientific paper

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.
This research was supported by the Deutsche Forschungsgemeinschaft with grant 436 RUS 17/13/07 and by the Russian Foundation for Basic Research with grant 05-02-39005-GFEN-a.

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