Internal dynamic of slowly rotating stars: mu-gradients effects on meridional circulation

Details Internal dynamic of slowly rotating stars: mu-gradients effects on meridional circulation Internal dynamic of slowly rotating stars: mu-gradients effects on meridional circulation

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf..143t&link_type=abstract

Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co

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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 efficiencies of both the meridional 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 the "creeping paralysis". Below convective zones, this process leads to another kind of mixing which may have important consequences. I will discuss this effect and show that it can account for the lithium plateau in halo stars.

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