Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..719m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 20, 1991, p. 719-738. Research supported by Margaret Cullinan Wr
Astronomy and Astrophysics
Astrophysics
39
Helium, Hydrogen, Stellar Envelopes, Stellar Evolution, Stellar Interiors, White Dwarf Stars, Schwarzschild Metric, Stellar Atmospheres, Stellar Mass Accretion, Stellar Temperature
Scientific paper
Stratified hydrogen/helium envelope models in diffusive equilibrium are calculated for a 0.6-solar-mass white dwarf for effective temperatures between 10,000 and 80,000 K in order to investigate the observational constraints placed on the total hydrogen mass. Convective mixing is included ab initio in the calculations, and synthetic spectra are used for comparing these models with observational materials. It is shown that evolutionary changes in the surface composition of white dwarfs cannot be explained by a model in which a small amount of hydrogen floats to the surface from initially being mixed in the outer parts of a helium envelope. It is pointed out that the shape of the hydrogen lines can be used for constraining theories of convective overshoot.
MacDonald James
Vennes Stephane
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