Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..455u&link_type=abstract
Astronomy and Astrophysics, v.306, p.455
Astronomy and Astrophysics
Astrophysics
18
Hydrodynamics, Turbulence, Stars: Chemically Peculiar, Stars: Rotation, Stars: Early Type
Scientific paper
We examine the steady state circulation and differential rotation in the radiative zones of early-type stars, following Zahn's assumption of latitude-independent rotation. The formulation includes in a consistent way the turbulence produced by shear, and the rotational and baroclinic forces driving the circulation. The angular momentum transfer by the combined action of meridional circulation and turbulence results in a differential rotation in the radiative zone. In its turn, the differential rotation causes the circulation (due to deviations from the spherical symmetry) and turbulence (due to instabilities associated with the shear stresses). Numerical results are given for the steady state in a 20Msun_ main sequence star. The circulation flow is very weak near the surface, and mixing between the internal and surface layers is practically absent even at high rotation rates. However, during the initial stage of evolution before the steady state is reached, a fraction of matter from the deep layers can be transported to the surface.
Shalybkov Dmitry A.
Spruit Hendrik C.
Urpin Vadim A.
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