The evolution of the magnetic fields of the chemically peculiar stars

Computer Science – Numerical Analysis

Scientific paper

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Peculiar Stars, Stellar Composition, Stellar Evolution, Stellar Magnetic Fields, Main Sequence Stars, Numerical Analysis, Stellar Models, Stellar Rotation

Scientific paper

There is a disagreement amongst observers as to whether the observed effective fields of the magnetic chemically peculiar stars undergo a significant decline during their main-sequence evolution. This paper re-examines the problem theoretically, using an improved computational algorithm to follow the evolution of large-scale magnetic fields of initially dipolar angular structure and various strengths. These fields are immersed in stellar models with masses of 2.25 M_sun;, 3.25 M_sun; and 4.05 M_sun;, during evolution to core hydrogen exhaustion. Most of the calculations are for the case of aligned rotation and magnetic axes, but an attempt is made to extend the work to arbitrary values of the inclination χ. It is concluded that, with plausible assumptions about the initial distribution both of the inclinations χ in space and of the magnetic field through the star, the change in surface field observed, when averaged over a sample of magnetic CP stars, might be quite small.

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