Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-13
Astrophys.J. 587 (2003) 777-783
Astronomy and Astrophysics
Astrophysics
7 printed pages, 1 figure. ApJ, in press (April 20, 2003)
Scientific paper
10.1086/368259
In the presence of rotation-induced mixing, element diffusion still occurs in stellar radiative zones, although at a slower rate than in the case of a complete stability of the stellar gas. As a consequence, helium settling leads to vertical $\displaystyle \mu $-gradients which, due to the meridional circulation, turn into horizontal fluctuations. Up to now, the feed-back effect of this process on the rotation-induced mixing was currently neglected in the computations of abundance variations in stellar surfaces, or artificially reduced. Here we analyse its consequences and derive an approximate analytical solution in a quasi-stationary case. We also discuss the relative importance of the various physical effects which influence the meridional circulation velocity. In a second paper (Th\'eado and Vauclair 2002a), we will present a complete 2D numerical simulation of this process while a third paper (Th\'eado and Vauclair 2002b) will be devoted to special applications to Pop I stars.
Theado Sylvie
Vauclair Sylvie
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