Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..560b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. 560-568. Research supported by SNSF, NSERC, and FCAR
Astronomy and Astrophysics
Astrophysics
40
Abundance, Magnetic Stars, Peculiar Stars, Stellar Atmospheres, Stellar Models, Atmospheric Ionization, Diffusion, Inhomogeneity, Particle Acceleration, Radiation Effects, Stellar Mass Ejection
Scientific paper
Published observational data on 53 Cam (Landstreet, 1988) are analyzed, with a focus on the derivation of magnetic and atmospheric parameters such as the radiative accelerations of Ca, Sc, Ti, Mn, Cr, and Sr. The results are presented in extensive tables and graphs and characterized in detail. A simple model of diffusion-dominated particle transport with no mass loss is constructed which (1) is for the most part uniquely determined by the observations, (2) can explain the observed average abundance anomalies if it is assumed that the magnetic field partially suppresses the H convection zone, but (3) cannot account for the time dependence and spatial distribution of the anomalies. A model with mass loss of (1-100) x 10 to the -14th solar mass/yr is shown to be more successful in reproducing the observed time dependences.
Babel Jacques
Michaud Georges
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