Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-04-06
J.Phys.Conf.Ser.172:012046,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 8 figures, to appear in Journal of Physics Conference Proceedings for the 16th European White Dwarf Workshop
Scientific paper
10.1088/1742-6596/172/1/012046
We present new calculations for the Stark broadening of the hydrogen line profiles in the dense atmospheres of white dwarf stars. Our improved model is based on the unified theory of Stark broadening from Vidal, Cooper & Smith, but it also includes non-ideal gas effects from the Hummer & Mihalas occupation probability formalism directly inside the line profile calculations. This approach improves upon previous calculations that relied on the use of an ad-hoc free parameter to describe the dissolution of the line wing opacity in the presence of high electric microfields in the plasma. We present here the first grid of model spectra for hot Teff >~ 12,000 K DA white dwarfs that has no free parameters. The atmospheric parameters obtained from optical and UV spectroscopic observations using these improved models are shown to differ substantially from those published in previous studies.
Bergeron Pierre
Dupuis Jean
Tremblay P.-E.
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