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Evidence of enhanced magnetism in cool, polluted white dwarfs

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Authors
Kawka, Adela
Vennes, S.
Ferrario, L.
Paunzen, E.
Date
2019
Type
Journal Article

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Kawka, A. and Vennes, S. and Ferrario, L. and Paunzen, E. 2019. Evidence of enhanced magnetism in cool, polluted white dwarfs. Monthly Notices of the Royal Astronomical Society. 482 (4): pp. 5201-5210.
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Monthly Notices of the Royal Astronomical Society
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Faculty of Science and Engineering
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School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Abstract

We report the discovery of a new, polluted, magnetic white dwarf in the Luyten survey of high-proper motion stars. High-dispersion spectra of NLTT 7547 reveal a complex heavy element line spectrum in a cool (≈5200 K) hydrogen-dominated atmosphere showing the effect of a surface averaged field of 163 kG, consistent with a 240 kG centred dipole, although the actual field structure remains uncertain. The abundance pattern shows the effect of accreted material with a distinct magnesium-rich flavour. Combined with earlier identifications, this discovery supports a correlation between the incidence of magnetism in cool white dwarfs and their contamination by heavy elements.