EDP Sciences
Free access
Issue
A&A
Volume 440, Number 1, September II 2005
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500156


A&A 440, L9-L12 (2005)
DOI: 10.1051/0004-6361:200500156

Letter

Stellar evolution with rotation and magnetic fields

IV. The solar rotation profile
P. Eggenberger, A. Maeder and G. Meynet

Observatoire de Genève, 51 chemin de Maillettes, 1290 Sauverny, Switzerland
    e-mail: Patrick.Eggenberger@obs.unige.ch

(Received 2 June 2005 / Accepted 16 July 2005)

Abstract
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 $R_{\odot}$, in good agreement with helioseismic measurements.


Key words: stars: rotation -- stars: magnetic fields -- stars: evolution




© ESO 2005