  Sequences of Doppler images of the young, rapidly rotating late-type stars AB
Dor and LQ Hya show that their equatorial angular velocity and the amplitude of
their surface differential rotation vary versus time. Such variations can be
modelled to obtain information on the intensity of the azimuthal magnetic
stresses within stellar convection zones. We introduce a simple model in the
framework of the mean-field theory and discuss briefly the results of its
application to those solar-like stars.

Astrophysics