Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-07-15
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
6 pages, 1 figure, to appear in Baltic Astronomy
Scientific paper
White dwarf stars are traditionally found to have surface compositions made primarily of hydrogen or helium. However, a new family has recently been uncovered, the so-called Hot DQ white dwarfs, which have surface compositions dominated by carbon and oxygen with little or no trace of hydrogen and helium (Dufour et al. 2007, 2008, 2010). Deriving precise atmospheric parameters for these objects (such as the effective temperature and the surface gravity) requires detailed modeling of spectral line profiles. Stark broadening parameters are of crucial importance in that context. We present preliminary results from our new generation of model atmosphere including the latest Stark broadening calculations for CII lines and discuss the implications as well as future work that remains to be done.
Ben Nessib Nebil
Dimitrijevic Milan S.
Dufour Patrick
Sahal-Bréchot Sylvie
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