We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Theoretical profiles of the Mg+ resonance lines perturbed by collisions with He.
- Authors
Allard, N. F.; Guillon, G.; Alekseev, V. A.; Kielkopf, J. F.
- Abstract
Context. The e ects 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.
- Subjects
MAGNESIUM ions; GALAXY mergers; STELLAR atmospheres; WHITE dwarf stars; HELIUM
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2016, Vol 593, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201628781