Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-14
Astron.Astrophys.399:263-270,2003
Astronomy and Astrophysics
Astrophysics
8 pages, 5 figures, accepted for publication in A& A
Scientific paper
10.1051/0004-6361:20021731
We derive a new expression for the coefficient $D_{\mathrm{h}}$ of diffusion by horizontal turbulence in rotating stars. This new estimate can be up to two orders of magnitude larger than given by a previous expression. As a consequence the differential rotation on an equipotential is found to be very small, which reinforces Zahn's hypothesis of shellular rotation. The role of the so--called $\mu$--currents, as well as the driving of circulation, are reduced by the large horizontal turbulence. Stellar evolutionary models for a 20 M${\odot}$ star are calculated with the new coefficient. The new and large $D_{\mathrm{h}}$ tends to limit the size of the convective core and at the same time it largely favours the diffusion of helium and nitrogen to the surface of rotating OB stars, a feature supported by recent observations.
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