Differential rotation of solar-type stars
Pascal Petit (Max-Planck Institut für Aeronomie)
Doppler and Zeeman-Doppler Imaging enable one to analyze the relative motion of active regions on the surface of solar-type stars, under the effect of differential rotation. From new measurements of the rotational shear on a small sample of objects, we confirm the increase of shear level with surface temperature reported by Collier Cameron (2002) and propose that tidal torques exerted on components of close binary systems significantly reduce the intensity of surface differential rotation.
http://webast.ast.obs-mip.fr/people/petit