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

par Merle, Thibault ;Thévenin, Frédéric;Belyaev, Andrey A.K.;Guitou, Marie;Feautrier, Nicole;Spielfiedel, Annie;Zatsarinny, Oleg
Référence EAS publications series, 63, page (331-336)
Publication Publié, 2013

Article révisé par les pairs

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Résumé :

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 Šis 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.