Distribution of helium and silicon in the atmospheres of Bp stars HD168785 and HD21699

We present a study of stratification of helium and silicon in the atmospheres of CP stars HD 168785 (He-r) and HD 21699 (He-w). The distribution of these elements with depth is well described by the mechanism of diffusion under the effect of gravity, radiation pressure and stellar wind. We studied t...

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Published in:Astrophysical bulletin 2011-01, Vol.66 (1), p.64-71
Main Authors: Leushin, V. V., Glagolevskij, Yu. V., Chountonov, G. A.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Atmosphere
Helium
Physics
Physics and Astronomy
Silicon
Stars & galaxies
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description We present a study of stratification of helium and silicon in the atmospheres of CP stars HD 168785 (He-r) and HD 21699 (He-w). The distribution of these elements with depth is well described by the mechanism of diffusion under the effect of gravity, radiation pressure and stellar wind. We studied the stratification of these elements in different regions of the surface of HD 21699. We demonstrate that as the star rotates the abundance of He and Si changes in the antiphase. The position of the abundance maximum varies within small limits with optical depth as well.
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subjects Astronomy
Astrophysics and Cosmology
Atmosphere
Helium
Physics
Physics and Astronomy
Silicon
Stars & galaxies
title Distribution of helium and silicon in the atmospheres of Bp stars HD168785 and HD21699
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