EDP Sciences
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Volume 477, Number 3, January III 2008
Page(s) 885 - 893
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20066841

A&A 477, 885-893 (2008)
DOI: 10.1051/0004-6361:20066841

On the circulation luminosity in uniformly rotating stars

H. Kähler

Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
    e-mail: hkaehler@hs.uni-hamburg.de

(Received 29 November 2006 / Accepted 29 August 2007)

The equations governing meridional circulation in uniformly rotating stars are discussed, allowing for turbulence and for baroclinic effects. Relations for barotropic stars with steady motions are generalized to baroclinic stars with turbulence. The circulation luminosity (i.e., the luminosity carried by circulation through a level surface) is shown to be zero in barotropic layers and positive in the bulk of a radiative envelope. The resulting effect is important in contact binaries.

Key words: stars: rotation -- stars: interiors

© ESO 2008