| Issue |
EAS Publications Series
Volume 63, 2013
New Advances in Stellar Physics: From Microscopic to Macroscopic Processes
|
|
|---|---|---|
| Page(s) | 403 - 406 | |
| Section | Posters | |
| DOI | https://doi.org/10.1051/eas/1363045 | |
| Published online | 19 December 2013 | |
New Advances in Stellar Physics: From Microscopic to Macroscopic Processes
G. Alecian, Y. Lebreton, O. Richard and G. Vauclair (eds)
EAS Publications Series, 63 (2013) 403–406
G. Alecian, Y. Lebreton, O. Richard and G. Vauclair (eds)
EAS Publications Series, 63 (2013) 403–406
Density Effects in Sodium and ionized Calcium perturbed by helium in Cool White Dwarf Stars
GEPI, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
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.
© EAS, EDP Sciences, 2013