Letter to the Editor
Stellar evolution with rotation and magnetic fields
IV. The solar rotation profile
Observatoire de Genève, 51 chemin de Maillettes, 1290 Sauverny, Switzerland e-mail: Patrick.Eggenberger@obs.unige.ch
Accepted: 16 July 2005
We examine the generation of a magnetic field in a solar-like star and its effects on the internal distribution of the angular velocity. We suggest that the evolution of a rotating star with magnetic fields leads to an equilibrium value of the differential rotation. This equilibrium is determined by the magnetic coupling, which favours a constant rotation profile, and meridional circulation which tends to build differential rotation. The global equilibrium stage is close to solid body rotation between about 0.7 and 0.2 , in good agreement with helioseismic measurements.
Key words: stars: rotation / stars: magnetic fields / stars: evolution
© ESO, 2005