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Statistical equilibrium of silicon in the atmospheres of cool stars

Published online by Cambridge University Press:  06 January 2014

J. R. Shi ,
T. Gehren ,
L. Mashonkina  and
G. Zhao
J. R. Shi
Affiliation:
1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China email: [email protected]
T. Gehren
Affiliation:
Universitäts-Sternwarte München, Scheinerstrasse 1, 81679 München, Germany
L. Mashonkina
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya Str. 48, 109017 Moscow, Russia
G. Zhao
Affiliation:
1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China email: [email protected]
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Abstract

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The statistical equilibrium of neutral and ionized silicon in the atmospheres of cool stars is discussed. Non-local thermodynamic equilibrium effects (NLTE) are investigated. It is found that the NLTE effects for Si are important, in particular for warm metal-poor stars. For warm metal-poor stars, the NLTE abundance correction reaches ~0.2 dex relative to standard LTE calculations.

Keywords

abundanceslate-typeline formationGalaxy
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S298: Setting the scene for Gaia and LAMOST , May 2013 , pp. 437
Copyright
Copyright © International Astronomical Union 2014 

References

Shi, J. R., Gehren, T., Butler, K., Mashonkina, L., & Zhao, G. 2008, AA, 486, 303CrossRefGoogle Scholar
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Shi, J. R., Takada-Hidai, M., Takeda, Y., Tan, K. F., Hu, S. M., Zhao, G., & Cao, C. 2012, ApJ, 755, 836CrossRefGoogle Scholar