Issue |
EAS Publications Series
Volume 63, 2013
New Advances in Stellar Physics: From Microscopic to Macroscopic Processes
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Page(s) | 209 - 217 | |
Section | Diffusion of Chemical Elements in Stars | |
DOI | https://doi.org/10.1051/eas/1363024 | |
Published online | 19 December 2013 |
G. Alecian, Y. Lebreton, O. Richard and G. Vauclair (eds)
EAS Publications Series, 63 (2013) 209–217
Abundance stratification in the atmospheres of blue horizontal-branch stars
Département de Physique et d'Astronomie, Université de Moncton, Moncton, Canada
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.
© EAS, EDP Sciences, 2013