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Clues to the origin and properties of magnetic white dwarfs

Published online by Cambridge University Press:  09 October 2020

Adela Kawka Open the ORCID record for Adela Kawka [Opens in a new window]
Adela Kawka*
Affiliation:
International Centre for Radio Astronomy Research - Curtin University GPO Box U1987, Perth, WA6845, Australia email: [email protected]
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Abstract

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A significant fraction of white dwarfs possess a magnetic field with strengths ranging from a few kG up to about 1000 MG. However, the incidence of magnetism varies when the white dwarf population is broken down into different spectral types providing clues on the formation of magnetic fields in white dwarfs. Several scenarios for the origin of magnetic fields have been proposed from a fossil field origin to dynamo generation at various stages of evolution. Offset dipoles are often assumed sufficient to model the field structure, however time-resolved spectropolarimetric observations have revealed more complex structures such as magnetic spots or multipoles. Surface mapping of these field structures combined with measured rotation rates help distinguish scenarios involving single star evolution from other scenarios involving binary interactions. I describe key observational properties of magnetic white dwarfs such as age, mass, and field strength, and confront proposed formation scenarios with these properties.

Keywords

white dwarfsstars: magnetic fieldsstars: atmospheres
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S357: White Dwarfs as Probes of Fundamental Physics: Tracers of Planetary, Stellar and Galactic Evolution , October 2019 , pp. 60 - 74
Copyright
© International Astronomical Union 2020

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