6533b86efe1ef96bd12cb3c9
RESEARCH PRODUCT
Theoretical profiles of the Mg + resonance lines perturbed by collisions with He
N. F. AllardN. F. AllardJohn F. KielkopfGrégoire GuillonV. A. Alekseevsubject
Opacity[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph]Ab initiochemistry.chemical_elementAstrophysics01 natural sciencesResonance (particle physics)Metal0103 physical sciencesstars: atmospheresAstrophysics::Solar and Stellar Astrophysics010306 general physics010303 astronomy & astrophysicsHeliumAstrophysics::Galaxy AstrophysicsLine (formation)white dwarfsPhysicsStellar atmosphereWhite dwarfAstronomy and Astrophysicsline: profileschemistry13. Climate actionSpace and Planetary Sciencevisual_artvisual_art.visual_art_mediumAstrophysics::Earth and Planetary AstrophysicsAtomic physics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]description
International audience; The effects of collision broadening by He are central to understanding the opacity of cool stellar atmospheres. Aims. DZ white dwarfs show metal lines which are, in many cases, believed to come from some rocky material, a remnant of a former exoplanetary system. The analysis of the Mg + resonance lines is a valuable method to determine the chemical abundances in these systems. Methods. Unified profiles of the strongest of the UV lines of Mg + have been calculated in the semi-classical approach using very recent ab initio potential energies. Results. We present the first theoretical line profile calculations of the resonance lines of Mg + that have been perturbed by helium in physical conditions of atmospheres in helium-rich white dwarfs with metal traces.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-08-29 |