| Issue |
EAS Publications Series
Volume 63, 2013
New Advances in Stellar Physics: From Microscopic to Macroscopic Processes
|
|
|---|---|---|
| Page(s) | 331 - 336 | |
| Section | Atomic Data and Opacities | |
| DOI | https://doi.org/10.1051/eas/1363037 | |
| Published online | 19 December 2013 | |
G. Alecian, Y. Lebreton, O. Richard and G. Vauclair (eds)
EAS Publications Series, 63 (2013) 331–336
Impact of new atomic data for the formation of the Mg I b triplet lines in benchmark stars
1 IAA, Université Libre de Bruxelles, CP. 226, Bd. du Triomphe, 1050 Brussels, Belgium
2 Lagrange, UMR 7293, Université de Nice Sophia-Antipolis, CNRS, OCA, 06300 Nice, France
3 Department of Theoretical Physics, Herzen University, St. Petersburg 191186, Russia
4 Department of Physics & Astronomy, Uppsala University, Box 515, 75120 Uppsala, Sweden
5 Université Paris-Est Marne-la-Vallée, MSME, UMR 8208 CNRS, 77454, France
6 LERMA, Observatoire de Paris, 92195 Meudon Cedex, France
7 Department of Physics and Astronomy, Drake University, Des Moines, IA 50311, USA
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.
© EAS, EDP Sciences, 2013