Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..533b&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Jan. 15, 1981, p. 533-549. Research supported by the Natural Sciences and Engineering
Astronomy and Astrophysics
Astrophysics
44
A Stars, Abundance, B Stars, Calcium, Magnetic Stars, Radiative Transfer, Stellar Atmospheres, Strontium, Atmospheric Composition, Ion Distribution, Photoionization, Radiation Pressure, Stellar Evolution, Stellar Magnetic Fields, Stellar Spectra, Thermodynamic Equilibrium
Scientific paper
A diffusion model explaining the calcium and strontium abundance anomalies in Hg-Mn and magnetic Ap stars is presented. Radiative acceleration calculations are performed, and the effects of line saturation and UV blanketing are discussed. In the Hg-Mn stars, the radiative acceleration on calcium and strontium decreases below gravity in the high photosphere. Both elements remain bound to the star even in the absence of a magnetic field. The equilibrium distributions for both elements are obtained, and the equivalent widths are derived using the nonuniform distribution. It is shown that the effect of the magnetic field in Ap stars on the radiative forces and equivalent line widths is significant.
Borsenberger J.
Michaud Georges
Praderie Francoise
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