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Abundance stratification in the atmospheres of blue horizontal-branch stars

Published online by Cambridge University Press:  19 December 2013

F. LeBlanc
F. LeBlanc*
Affiliation:
Département de Physique et d'Astronomie, Université de Moncton, Moncton, Canada
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Abstract

Horizontal-branch stars with effective temperatures larger than approximately 11 500 K show abundance anomalies as well as other peculiar observational properties believed to be due to atomic diffusion in their atmosphere. These stars possess low rotational velocities that makes it possible for atomic diffusion to come into play and are therefore of great interest with respect to diffusion theory. Observational anomalies of blue horizontal-branch stars found in globular clusters such as photometric jumps and gaps are reviewed. Recent detections of vertical stratification of elements are also discussed. These results are compared to predictions of atmospheric modeling while including vertical stratification of the elements. The atmospheric structure of these models is calculated self-consistently while taking into account vertical stratification of the elements.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 209 - 217
Copyright
© EAS, EDP Sciences, 2013

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