Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...65..367j&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 65, no. 2, Aug. 1986, p. 367-377.
Astronomy and Astrophysics
Astrophysics
37
Atmospheric Composition, Atmospheric Models, Atmospheric Stratification, Stellar Models, Stellar Spectra, White Dwarf Stars, Extreme Ultraviolet Radiation, Gaseous Diffusion, Helium, Hot Stars, Hydrogen, Radiant Flux Density
Scientific paper
White dwarfs showing He and H features in their spectrum have almost exclusively been interpreted in terms of chemically homogeneous atmospheres with widely varying H/He ratios. In view of the extremely short diffusion time scales an alternative explanation might be a thin H layer on top of a He shell with a transition region as determined from diffusion equilibrium. In this paper the authors report results of model atmospheres and synthetic spectra calculations for such models. Temperature structure and emerging spectral fluxes are discussed, with emphasis on the EUV range where a number of hot white dwarfs has been observed in the past and more data are collected presently by EXOSAT.
Jordan Stefan
Koester Detlev
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