Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..741m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 741-744. NSERC-supported research.
Astronomy and Astrophysics
Astrophysics
44
B Stars, Hot Stars, Metallicity, Particle Diffusion, Stellar Composition, Stellar Mass Ejection, Subdwarf Stars, Silicon, Stellar Envelopes, Stellar Evolution, Stellar Temperature
Scientific paper
The abundance anomalies generated by diffusion in the envelopes of hot, hydrogen-rich subdwarfs are studied. It is shown that unimpeded diffusion cannot lead to the large silicon underabundance observed in those stars at effective temperatures above 30,000 K. Calculations of diffusion of heavy elements in the presence of mass loss are also performed. For a mass-loss rate of 2.5 x 10 to the -15th solar masses/year, the observed abundance patterns of C, N, and Si are reproduced on a time scale of about 100,000 yr. Lower mass-loss rates would necessitate longer time scales. The pattern of abundance anomalies may eventually be used to constrain both the mass-loss rate and the stellar lifetime in the sdB evolutionary phase.
Bergeron Pierre
Fontaine Gérard
Michaud Georges
Wesemael François
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