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Atomic diffusion and stellar evolution

Published online by Cambridge University Press:  19 December 2013

G. Michaud  and
J. Richer
G. Michaud
Affiliation:
Département de physique, Université de Montréal, Montréal, Québec, H3C 3J7, Canada LUTH, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
J. Richer
Affiliation:
Département de physique, Université de Montréal, Montréal, Québec, H3C 3J7, Canada
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Abstract

Stellar models including atomic diffusion processes (gravitational settling, radiative accelerations, thermal diffusion, in addition to the purely diffusive term) have now been evolved throughout most of stellar evolution. We review some of the major roles of diffusion processes in stellar evolution. The emphasis is on interior properties. Examples include Populations I and II stars. It is emphasized that competing advective processes such as mass loss or meridional circulation modify internal concentrations differently from turbulent diffusion even when they lead to the same surface abundances. Radiative accelerations play a major role in horizontal branch and sdB stars.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 199 - 208
Copyright
© EAS, EDP Sciences, 2013

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