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

  • S. Théado (a1) and S. Vauclair (a1)

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 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.

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References

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

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

  • S. Théado (a1) and S. Vauclair (a1)

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