Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..515m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 515-522
Astronomy and Astrophysics
Astrophysics
7
Compton Effect, Local Thermodynamic Equilibrium, Photons, Radiative Transfer, Scattering, Stellar Atmospheres, White Dwarf Stars, X Ray Spectra, Continuous Spectra, Stellar Composition, Stellar Structure
Scientific paper
Model atmospheres of white dwarf stars are routinely computed taking into account coherent (Thomson) scattering on free electrons. This paper presents a set of local thermodynamic equilibrium (LTE) model atmospheres computed with the account of noncoherent Compton scattering, which in a physically correct way describes photon frequency changes at the time of scattering. Effective temperatures Teff of white dwarfs chosen here are in the range 1 x 105 K to 2 x 105 K, and are relevant to the hottest known white dwarf stars. Surface gravity ranges from log g = 8.0 down to 5.2 (c.g.s. units). Model atmospheres assume pure hydrogen, mixed hydrogen/helium and pure helium chemical composition, thus corresponding to DA, DAO, and DO classes of white dwarfs. Theoretical X-ray spectra which are presented here yet cannot account for the observed deficiency of hot DA white dwarfs in the ROSAT X-ray and EUV surveys. However, significant heating of some model atmospheres in the uppermost layers could have impact on the profiles of the strongest spectral lines.
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