Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..147b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 1, Oct. 1984, p. 147-160.
Astronomy and Astrophysics
Astrophysics
17
Metallic Stars, Peculiar Stars, Radiation Pressure, Stellar Composition, A Stars, Abundance, Barium, Beryllium, Diffusion Theory, Hertzsprung-Russell Diagram, Magnesium, Stellar Atmospheres, Stellar Envelopes, Stellar Spectra
Scientific paper
In order to understand the pattern of over- and underabundances observed in HgMn stars, the behavior of three characteristic elements (Be, Mg, and Ba) was studied using theoretical models of diffusion processes. It is shown that the radiative acceleration computed in the atmospheres and envelopes of these stars account for the largest observed anomalies for Be, Mg, and Ba. The overabundance of Ba is calculated to be about 1000, larger than any yet observed. Some of the physical processes which might be causing the slow diffusion of Be in the atmosphere of HgMn stars are discussed, and the effect of abundance anomalies in H-R diagrams is considered.
Borsenberger J.
Michaud Georges
Praderie Francoise
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