On the decay of the toroidal component of a large-scale stellar magnetic field

Astronomy and Astrophysics – Astronomy

Scientific paper

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Magnetic Field Configurations, Stellar Magnetic Fields, Toroids, Coupling, Early Stars, Poloidal Flux, Stellar Temperature

Scientific paper

The problem of the decay of a large-scale stellar toroidal field is reformulated so as to take account of the strong dynamical coupling between poloidal and toroidal fields. Numerical results suggest that in an early-type star a surface toroidal field can survive over a stellar lifetime if the star has a hot corona, but if the coronal temperature is no higher than 104K, an observable toroidal field will disappear unless it has an energy source.

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