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Magnetohydrodynamic star-in-a-box simulations of convection and dynamos in asolar-like star with different rotation rates are presented. These simulationsproduce solar-like differential rotation with a fast equator and slow poles,and magnetic activity that resembles that of the Sun with equatorward migratingactivity at the surface. Furthermore, the ratio of rotation to cycle period isalmost constant as the rotation period decreases in the limited sampleconsidered here. This is reminiscent of the suggested inactive branch of starsfrom observations and differs from most earlier simulation results fromspherical shell models. While the exact excitation mechanism of the dynamos inthe current simulations is not yet clear, it is plausible that the greaterfreedom that the magnetic field has due to the inclusion of the radiative coreand regions exterior to the star are important in shaping the dynamo.

Solar-like dynamos and rotational scaling of cycles from star-in-a-box simulations