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Non-rigid precession of magnetic stars

Non-rigid precession of magnetic stars
Non-rigid precession of magnetic stars
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.
0035-8711
4343–4382
Lander, S.K.
2cad9dc5-3e37-44ed-8ffc-009e7daba257
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Lander, S.K.
2cad9dc5-3e37-44ed-8ffc-009e7daba257
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160

Lander, S.K. and Jones, D.I. (2017) Non-rigid precession of magnetic stars. Monthly Notices of the Royal Astronomical Society, 467 (4), 4343–4382. (doi:10.1093/mnras/stx349).

Record type: Article

Abstract

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.

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Accepted/In Press date: 2 February 2017
e-pub ahead of print date: 9 February 2017
Published date: June 2017
Organisations: Applied Mathematics

Identifiers

Local EPrints ID: 405695
URI: http://eprints.soton.ac.uk/id/eprint/405695
ISSN: 0035-8711
PURE UUID: bd646850-57ef-4176-966e-7b419a769ebe
ORCID for D.I. Jones: ORCID iD orcid.org/0000-0002-0117-7567

Catalogue record

Date deposited: 10 Feb 2017 10:16
Last modified: 07 Oct 2020 01:43

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Contributors

Author: S.K. Lander
Author: D.I. Jones ORCID iD

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