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Magnetic dynamos in white dwarfs – II. Relating magnetism and pollution
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Schreiber, Matthias R., Belloni, Diogo, Gaensicke, Boris T. and Parsons, Steven G. (2021) Magnetic dynamos in white dwarfs – II. Relating magnetism and pollution. Monthly Notices of the Royal Astronomical Society: Letters, 506 (1). L29-L34. doi:10.1093/mnrasl/slab069 ISSN 1745-3925.
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Official URL: https://doi.org/10.1093/mnrasl/slab069
Abstract
We investigate whether the recently suggested rotation and crystallization driven dynamo can explain the apparent increase of magnetism in old metal polluted white dwarfs. We find that the effective temperature distribution of polluted magnetic white dwarfs is in agreement with most/all of them having a crystallizing core, and increased rotational velocities are expected due to accretion of planetary material that is evidenced by the metal absorption lines. We conclude that a rotation and crystallization driven dynamo offers not only an explanation for the different occurrence rates of strongly magnetic white dwarfs in close binaries but also for the high incidence of weaker magnetic fields in old metal polluted white dwarfs.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||
Library of Congress Subject Headings (LCSH): | White dwarf stars -- Magnetic properties, Extrasolar planets -- Atmopsheres, Planets, Astrophysics | |||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society: Letters | |||||||||||||||
Publisher: | Wiley | |||||||||||||||
ISSN: | 1745-3925 | |||||||||||||||
Official Date: | 24 June 2021 | |||||||||||||||
Dates: |
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Volume: | 506 | |||||||||||||||
Number: | 1 | |||||||||||||||
Page Range: | L29-L34 | |||||||||||||||
DOI: | 10.1093/mnrasl/slab069 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved. | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 31 May 2022 | |||||||||||||||
Date of first compliant Open Access: | 1 June 2022 | |||||||||||||||
RIOXX Funder/Project Grant: |
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