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Impact of new atomic data for the formation of the Mg I b triplet lines in benchmark stars

Published online by Cambridge University Press:  19 December 2013

T. Merle ,
F. Thévenin ,
A.K. Belyaev ,
M. Guitou ,
N. Feautrier ,
A. Spielfiedel  and
O. Zatsarinny
T. Merle
Affiliation:
IAA, Université Libre de Bruxelles, CP. 226, Bd. du Triomphe, 1050 Brussels, Belgium
F. Thévenin
Affiliation:
Lagrange, UMR 7293, Université de Nice Sophia-Antipolis, CNRS, OCA, 06300 Nice, France
A.K. Belyaev
Affiliation:
Department of Theoretical Physics, Herzen University, St. Petersburg 191186, Russia Department of Physics & Astronomy, Uppsala University, Box 515, 75120 Uppsala, Sweden
M. Guitou
Affiliation:
Université Paris-Est Marne-la-Vallée, MSME, UMR 8208 CNRS, 77454, France
N. Feautrier
Affiliation:
LERMA, Observatoire de Paris, 92195 Meudon Cedex, France
A. Spielfiedel
Affiliation:
LERMA, Observatoire de Paris, 92195 Meudon Cedex, France
O. Zatsarinny
Affiliation:
Department of Physics and Astronomy, Drake University, Des Moines, IA 50311, USA
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Abstract

We aim to improve the calculation of the Mg I line profiles in benchmark stars and to assess the impact of the new quantum mechanical calculations of inelastic collisions with hydrogen. The method is based on the non-Local Thermodynamic Equilibrium (NLTE) line formation using updated atomic data for a simple model atom of Mg I. Focus on the formation of the Mg I b triplet lines at 5167, 5172 and 5183 Å is presented for the Sun, Arcturus, HD 84937 (metal-poor dwarf) and HD 122563 (metal-poor giant). This study is preliminary and essentially tests the new atomic data. In this context, we show that NLTE effects are smaller for this triplet when quantum mechanical H collisions are included compared with the use of the semi-classical Drawin's formula.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 331 - 336
Copyright
© EAS, EDP Sciences, 2013

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