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Diffusion of a trace element in anisotropic radiative hydrodynamic turbulence

Published online by Cambridge University Press:  13 January 2006

G. Alecian ,
O. Richard ,
S. Vauclair ,
A. Vincent  and
F. Lignières
A. Vincent
Affiliation:
Département de Physique, Université de Montréal, CP. 6128, Succ. A, Montréal, Québec H3C 3J7, Canada
F. Lignières
Affiliation:
Laboratoire d'Astrophysique de Toulouse et Tarbes, Observatoire Midi-Pyrénées, 14 avenue É. Belin, 31400 Toulouse, France
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Abstract

We consider the problem of trace elements diffusion in parts of radiative envelopes where radiative transfer is not negligible, i.e. viscosity is mainly due to an exchange of momentum between photons and ions and when one haslocal thermodynamical equilibrium. The flow is madeanisotropic by an external shear that mimics the effect ofmeridional circulation. Although the photons are nearly thermalized,the radiation field is not isotropic because there is an externalflux of radiation in the radial (here vertical) directionThe tracer is then releasedinto the flow and we study how the anisotropy of turbulencebreaks the diffusion of a trace element.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 17: Element Stratification in Stars: 40 Years of Atomic Diffusion , 2005 , pp. 197 - 202
Copyright
© EAS, EDP Sciences, 2005

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