Astrophysical tests of atomic data important for the stellar Mg abundance determinations

¹ Universitäts-Sternwarte München, Scheinerstr. 1, 81679 München, Germany
e-mail: lyuda@usm.lmu.de;lima@inasan.ru
² Institute of Astronomy, Russian Academy of Sciences, 119017 Moscow, Russia

Received: 19 November 2012
Accepted: 11 December 2012

Abstract

Context. Magnesium abundances of cool stars with different metallicities are important for understanding the galactic chemical evolution.

Aims. This study tests atomic data used in stellar magnesium abundance analyses.

Methods. We evaluate nonlocal thermodynamical equilibrium (NLTE) line formation for Mg i, using the most up-to-date theoretical and experimental atomic data available so far, and check the Mg abundances from individual lines in the Sun, four well studied A-type stars, and three reference metal-poor stars.

Results. With the adopted gf-values, NLTE abundances derived from the Mg i 4703 Å, 5528 Å, and Mg ib lines are consistent within 0.05 dex for each A-type star. The same four Mg i lines in the solar spectrum give consistent NLTE abundances at log N_Mg/N_H =  −4.45, when correcting van der Waals damping constants inferred from the perturbation theory. Inelastic Mg+H collisions as treated by Barklem, Belyaev, Spielfiedel, Guitou, and Feautrier serve as an efficient thermalizing process for the statistical equilibrium of Mg i in the atmospheres of metal-poor stars. The use of Mg+H collision data improves Mg abundance determinations for HD 84937 and HD 122563, though it does not completely remove the differences between different lines.