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White dwarf stars with chemically stratified atmospheresRecent 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.
Document ID
19820058448
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Muchmore, D. (Delaware, University Newark, DE, United States)
Date Acquired
August 10, 2013
Publication Date
August 15, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF AST-78-2435
CONTRACT_GRANT: NAG8-390
Distribution Limits
Public
Copyright
Other