Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..630v&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
Stars, Mixing Processes, Diffusion Processes, Abundances, Helioseismology
Scientific paper
In slowly rotating stars, the coupling of helium settling and meridional circulation leads to a particular hydrodynamical process which was not introduced in previous computations of abundance variations. The μ -gradients induced by element settling can lead to a quasi-paralysis stage in which the efficiency of both the circulation and the microscopic diffusion are strongly reduced. Such an effect was studied in the eighties by Mestel et al. but in the stellar cores where the μ -gradients can lead to a process which they called ``creeping paralysis''. Below convective zones, this process leads to another kind of mixing which may have important consequences. We show that this effect can account for the lithium plateau in halo stars and discuss the solar case.
Theado Sylvie
Vauclair Sylvie
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