Non-rigid precession of magnetic stars

Lander, S. K. and Jones, D. I. (2017) Non-rigid precession of magnetic stars. Monthly Notices of the Royal Astronomical Society, 467 (4). pp. 4343-4382. ISSN 0035-8711

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Stars are, generically, rotating and magnetized objects with a misalignment between their magnetic and rotation axes. Since a magnetic field induces a permanent distortion to its host, it provides effective rigidity even to a fluid star, leading to bulk stellar motion that resembles free precession. This bulk motion is, however, accompanied by induced interior velocity and magnetic field perturbations, which are oscillatory on the precession time-scale. Extending previous work, we show that these quantities are described by a set of second-order perturbation equations featuring cross-terms scaling with the product of the magnetic and centrifugal distortions to the star. For the case of a background toroidal field, we reduce these to a set of differential equations in radial functions, and find a method for their solution. The resulting magnetic field and velocity perturbations show complex multipolar structure and are strongest towards the centre of the star.

Item Type: Article
Uncontrolled Keywords: stars:interiors,stars:magnetic field,stars:oscillations,stars:rotation,astronomy and astrophysics,space and planetary science ,/dk/atira/pure/subjectarea/asjc/3100/3103
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Depositing User: LivePure Connector
Date Deposited: 28 Jan 2020 03:52
Last Modified: 22 Oct 2022 05:45
DOI: 10.1093/mnras/stx349

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