Evidence of enhanced magnetism in cool, polluted white dwarfs
Solar and Stellar Astrophysics
2018-11-28 v1
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 (~5 200 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.
Keywords
Cite
@article{arxiv.1811.03210,
title = {Evidence of enhanced magnetism in cool, polluted white dwarfs},
author = {Adela Kawka and Stephane Vennes and Lilia Ferrario and Ernst Paunzen},
journal= {arXiv preprint arXiv:1811.03210},
year = {2018}
}
Comments
Accepted for publication in MNRAS