Stellar magnetic cycles

Stellar magnetic cycles

The solar activity cycle is a manifestation of the hydromagnetic dynamo working inside our star. The detection of activity cycles in solar-like stars and the study of their properties allow us to put the solar dynamo in perspective, investigating how dynamo action depends on stellar parameters and stellar structure. Nevertheless, the lack of spatial resolution and the limited time extension of ...

Asteroseismic Signatures of Stellar Magnetic Activity Cycles

Observations of stellar activity cycles provide an opportunity to study magnetic dynamos under many different physical conditions. Space-based asteroseismology missions will soon yield useful constraints on the interior conditions that nurture such magnetic cycles, and will be sensitive enough to detect shifts in the oscillation frequencies due to the magnetic variations. We derive a method for...

Life Cycles of Magnetic Fields in Stellar Evolution

Fusion Cycles in Stars and Stellar Neutrinos

Starting from the early works by Weizsäcker and Bethe about fusion cycles and energy conversion in stars, a brief survey of thermonuclear processes in stars leading to contemporary research problems in this field is given. Special emphasis is put on the physics of stellar and, in particular, solar neutrinos which is at the frontline of current investigations. Email: [email protected] http://wo...

Theoretical Basis of Stellar Activity Cycles

Numerical simulations of hydromagnetic turbulence in the presence of shear and/or convection have given us new clues as to how the solar dynamo might work. Simulations suggest that here is signiicant large-scale magnetic eld generation at the bottom of the convection zone, where the radial shear is largest. The nature of the dynamo in the simulations seems to be qualitatively similar to an-dyna...