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Internal Dynamics of Slowly Rotating Stars: the Effect of μ-Gradients on the Meridional Circulation

Published online by Cambridge University Press:  12 April 2016

S. Théado  and
S. Vauclair
S. Théado
Affiliation:
Laboratoire d’Astrophysique, Observatoire Midi-Pyrénées, Toulouse, France
S. Vauclair
Affiliation:
Laboratoire d’Astrophysique, Observatoire Midi-Pyrénées, Toulouse, France

Abstract

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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 μ-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 for nuclear-induced μ-gradients by Mestel et al., who called it “creeping paralysis”. Below convective zones, this process has important consequences. Here we discuss the case of the halo stars and the sun.

Type
Part 1.1. Theoretical Aspects
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 70 - 71
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Théado, S. & Vauclair, S. 2001, A&A, 375, 70 Google Scholar
Richard, O., Vauclair, S., Charbonnel, C., & Dziembowski, W.A. 1996, A&A, 312, 1000 Google Scholar