Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..749m&link_type=abstract
Astrophysical Journal, Part 1, vol. 259, Aug. 15, 1982, p. 749-758. Research supported by the A. J. Cannon Fund
Astronomy and Astrophysics
Astrophysics
15
Atmospheric Chemistry, Atmospheric Stratification, Stellar Atmospheres, Stellar Models, Ultraviolet Spectra, White Dwarf Stars, Atmospheric Models, Atmospheric Temperature, Extreme Ultraviolet Radiation, Helium, Hydrogen, Stellar Envelopes, Stellar Spectra, Stellar Temperature, Temperature Inversions
Scientific paper
Recent observations and theory suggest that some white dwarfs may have chemically stratified atmospheres - thin layers of hydrogen lying above helium-rich envelopes. Models of such atmospheres show that a discontinuous temperature inversion can occur at the boundary between the layers. Model spectra for layered atmospheres at 30,000 K and 50,000 K tend to have smaller decrements at 912 A, 504 A, and 228 A than uniform atmospheres would have. On the basis of their continuous extreme ultraviolet spectra, it is possible to distinguish observationally between uniform and layered atmospheres for hot white dwarfs.
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