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Calcium – an important diagnostic tool for the first stars

Published online by Cambridge University Press:  23 December 2005

Andreas J. Korn  and
Lyudmila Mashonkina
Andreas J. Korn
Affiliation:
Uppsala Astronomical Observatory (UAO), Box 515, 75120 Uppsala, Sweden email: akorn@astro.uu.se
Lyudmila Mashonkina
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, 48 Pyatnitskaya St., 119017 Moscow, Russia email: lima@inasan.ru
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Abstract

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For refining cosmochemical studies, we are investigating the statistical equilibrium (non-LTE) of neutral and singly-ionized calcium (CaI/II) in the atmospheres of solar-type stars. The envisioned applications are a) detailed abundance studies beyond classical models, b) using CaI/II as a gravity indicator for ultra-metal-poor (UMP) stars and c) detailed modelling of the CaII IR triplet lines for the astrophysical parametrization of the Gaia mission. We present first results for some well-studied reference cases, both at solar and low metallicity.

Keywords

Radiative transferline: formationmethods: numericalstars: late-typestars: atmospheresstars: abundancestechniques: spectroscopicstars: fundamental parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 263 - 264
Copyright
© 2005 International Astronomical Union