6533b83afe1ef96bd12a7a03
RESEARCH PRODUCT
Temperature dependence of sodium and ionized calcium resonance lines perturbed by helium
Grégoire GuillonAlexandra VielNicolle F AllardNicolle F AllardJohn F. KielkopfDerek Homeiersubject
HistoryAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsHelium01 natural sciencesAstronomical spectroscopySpectral lineEducation0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010306 general physics010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics[PHYS]Physics [physics][PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph]ChemistryStellar atmosphereWhite dwarfAstronomyPlanetary system[PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]Accretion (astrophysics)Computer Science ApplicationsStars13. Climate actionCircumstellar dustAtomic and molecular collisions[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]Astrophysics::Earth and Planetary AstrophysicsMolecular physics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]description
International audience; Traces of heavy metals in cool DZ white dwarf stars may be attributed to the accretion of circumstellar dust thought to originate from tidal disruption of rocky parent bodies. Spectra of such stars therefore provide a unique opportunity to study the composition of extrasolar planetary systems. The determination of metal abundances from stellar spectra depends on stellar atmospheric parameters and an accurate prior knowledge of the collision broadening of the line profiles by the most common constituents of the stellar atmosphere. For this purpose, we present theoretical absorption spectra of Na and Ca+ broadened by He for the conditions prevailing in cool white dwarfs.
year | journal | country | edition | language |
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2014-11-01 | Journal of Physics: Conference Series |