Evidence of enhanced magnetism in cool, polluted white dwarfs. (arXiv:1811.03210v1 [astro-ph.SR])

Evidence of enhanced magnetism in cool, polluted white dwarfs. (arXiv:1811.03210v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Kawka_A/0/1/0/all/0/1">Adela Kawka</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vennes_S/0/1/0/all/0/1">Stephane Vennes</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ferrario_L/0/1/0/all/0/1">Lilia Ferrario</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Paunzen_E/0/1/0/all/0/1">Ernst Paunzen</a>

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.

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.

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