Obliquity and magnetic dipole radiation from collapsing,rotating, magnetized stars |
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| Authors: | W Y Chau J L Zhang |
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| Institution: | (1) Physics Department, University of Hong Kong, Hong Kong;(2) Present address: Queen's University at Kingston, Ontario, Canada;(3) Present address: Center for Astrophysics, University of Science and Technology of China, Hefei Auhwei, People's Republic China |
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| Abstract: | We consider in this paper the evolution of a collapsing (or exploding), uniformly rotating, uniformly magnetized spheroidal star with non-aligned rotational and magnetic axes. Analytical expressions were obtained for the change in angle (obliquity) between the two axes (based on the frozen field condition), and the energy loss via magnetic, dipole radiation. Numerical estimates with typical data show that the obliquity increases (asymptotically to  /2) with the collapse from white dwarf to neutron star, and the energy loss could be as much as 4×1039 ergs, about twice the amount emitted when the two axes are aligned. |
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