POSTER PAPER 1.12
Internal Dynamics of Slowly Rotating Stars
Sylvie Vauclair and Sylvie Theado
Institute: Laboratoire d'Astrophysique de Toulouse
Contact Email: svcr@obs-mip.fr
Abstract:
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
mu-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 mu-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.
Index Keywords: Stars: Mixing Processes, Diffusion Processes, Abundances, Helioseismology
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Manuscript submitted: 2001-Aug-13
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.