Non-dipolar magnetic fields in Ap stars

Details Non-dipolar magnetic fields in Ap stars Non-dipolar magnetic fields in Ap stars

2008-01-29

arxiv.org/abs/0801.4562v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. To appear in the proceedings of the CP/Ap-star workshop, Vienna, September 2007

Scientific paper

An arbitrary initial magnetic field in an A star evolves into a stable equilibrium. Simulations are presented of the formation of non-axisymmetric equilibria consisting of twisted flux tubes meandering under the surface of the star, and analytic arguments are given relating the stability and form of these equilibria. These results may help to explain observations of Ap stars with very non-dipolar fields. This work is also applicable to other essentially non-convective stars such as white dwarfs and neutron stars.

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