The evolution of a model magnetic star from the zero age main sequence

Astronomy and Astrophysics – Astronomy

Scientific paper

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Magnetic Stars, Main Sequence Stars, Stellar Evolution, Stellar Models, Perturbation Theory, Stellar Magnetic Fields, Stellar Rotation

Scientific paper

First order perturbation theory is used to investigate the evolution of a 2.25-solar mass model star containing a magnetic field of dipolar angular structure whose axis is parallel to the rotation axis. Quasi-static models are followed from the zero age main sequence up to the stage of core hydrogen exhaustion, at about 350 million years. When the time-dependent MHD and perturbed energy equations are solved explicitly, the calculations halt after a time of the order of 100,000 years due to what are suggested to be difficulties in the region immediately exterior to the convective core. The surface field declines monotonically, and its evolution is found to be insensitive to the assumptions made about the region near the core surface. The e-folding time of surface field decay is of the order of the main sequence lifetime of the star.

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