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Differential Rotation and Dynamo Action in Solar-like Stars


Varela Jacobo




Auteur(s) supplémentaire(s)A. Strugarek and A. S. Brun
Institution(s) supplémentaire(s)Département de Physique, Université de Montréal, C.P. 6128 Succ. Centre-Ville, Montréal, QC, H3C-3J7, Canada


The differential rotation of solar-like stars is influenced by rotation rate and mass in presence of magnetic fields generated by a convective dynamo. We use the ASH code to model the convective dynamo of solar-like stars at various rotation rates and masses, hence different effective Rossby numbers. We obtained models with either prograde (solar-like) or retrograde (anti-solar-like) differential rotation. We study the trends of differential rotation versus stellar rotation rate obtained for simulations including the effect of the magnetic field compared with the hydro cases, showing a better agreement with the observations in the magnetic models. Analysis of angular momentum transport revealed that the simulations with retrograde and prograde differential rotation have opposite distribution of the viscous, turbulent Reynolds stresses and meridional circulation contributions. The thermal wind balance is achieved in the prograde cases. However, in retrograde cases Reynolds stresses are dominant for high latitudes and near the top of the convective layer. Baroclinic effects are stronger for faster rotating models. In most cases we observe temporal fluctuations of angular velocity that could be interpreted as torsional oscillations.

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