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Atomic diffusion and element mixing in pulsating stars

Published online by Cambridge University Press:  18 February 2014

Georges Alecian
Georges Alecian*
Affiliation:
LUTH (Observatoire de Paris - CNRS), Observatoire de Meudon, F-92190 Meudon, France, email: georges.alecian@obspm.fr
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Abstract

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Stellar plasmas are multicomponent anisotropic gases. Each component (chemical element) of these gases experiences specific forces related to its properties, which leads each element to diffuse with respect to the others. There is no reason why a stellar plasma should remain homogeneous except if mixing motions enforce homogeneity. Because atomic diffusion is a very slow process, the element separation only occurs in places where mixing motions are weak enough not to erase the effect of the ineluctable tendency of chemical elements to migrate. In this talk, I will present how atomic diffusion and mixing processes compete in stars (interiors as well as atmospheres), and I will show various cases where atomic diffusion is believed to have noticeable effects. This concerns several types of stars throughout the H-R diagram, including pulsating ones.

Keywords

atomic processesdiffusionturbulencestars: mass lossstars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 185 - 191
Copyright
Copyright © International Astronomical Union 2014 

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