Other
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..496l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. 496-504. NSERC-supported research.
Other
30
Abundance, B Stars, Carbon, Nitrogen, Silicon, Stellar Spectra, Subdwarf Stars, Hot Stars, Iue, Spectrum Analysis, Stellar Atmospheres, Stellar Composition, Ultraviolet Spectra, Visible Spectrum
Scientific paper
Optical and high-dispersion IUE observations of three hot B subdwarfs (UV 1758 + 36, Ton S-227, and Feige 65) are presented. These data are analyzed with model atmosphere techniques, and element abundances for C, N, and Si are derived. The abundances are either near (N) or below (C, Si) the solar value; large variations (1) in the extent of underabundances of carbon and silicon among the objects, as well as (2) in the abundances (with respect to the solar values) characterizing each star are observed. A preliminary interpretation of the observed variations in these and other hot subdwarfs in terms of radiative forces disrupting the downward diffusion of heavy elements is presented.
Fontaine Gérard
Lamontagne Robert
Sion Edward M.
Wesemael François
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