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Density Effects in Sodium and ionized Calcium perturbed by helium in Cool White Dwarf Stars

Published online by Cambridge University Press:  19 December 2013

N.F. Allard
N.F. Allard*
Affiliation:
GEPI, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
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Abstract

Traces of heavy metal in cool DZ white dwarfs may be attributed to the accretion of circumstellar dust. This dust is thought to originate from the tidal disruption of some rocky material, they provide a unique opportunity to study the composition of extra-solar planetary systems. The determinations of precise atmospheric parameters and abundances require accurate description of the line profiles of the identified features. We present absorption spectra of Na-He and Ca+-He for the conditions prevailing in cool white dwarfs.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 403 - 406
Copyright
© EAS, EDP Sciences, 2013

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References

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