Abondances NLTE de Ca, Mg, C, Si dans quelques étoiles A.

Abstract

Some results on Ca, Mg, C and Si abundances are given for some A stars of the solar neighbourhood. The abundances are determined via the comparison of computed and observed line resonance profiles, in the framework of the NLTE theory, with atom models reduced to a few atomic levels. The obtained NLTE abundance values are then compared to the LTE ones obtained from the literature. Finally, the possibility to enlarge this method for abundance determinations and also its limitations and constraints are discussed.