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BY-NC-ND 4.0 license Open Access Published by De Gruyter Open Access March 23, 2017

Stark Broadening of Carbon and Oxygen Lines in Hot DQ White Dwarf Stars: Recent Results and Applications

P. Dufour EMAIL logo , N. Ben Nessib , S. Sahal-Bréchot and M. S. Dimitrijević
From the journal Open Astronomy

Abstract

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 atmospheres including the latest Stark broadening calculations for C II lines and discuss the implications as well as future work that remains to be done.

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Received: 2011-8-8
Accepted: 2011-8-15
Published Online: 2017-3-23
Published in Print: 2011-12-1

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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