The nearby magnetic cool DZ white dwarf PM J08186-3110

Adela Kawka; Stéphane Vennes; Nicole F. Allard; T. Leininger; F. X. Gadéa

doi:10.1093/mnras/staa3421

The nearby magnetic cool DZ white dwarf PM J08186-3110

Adela Kawka^*, Stéphane Vennes, Nicole F. Allard, T. Leininger, F. X. Gadéa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

We present an analysis of photometric, spectroscopic, and spectropolarimetric data of the nearby, cool, magnetic DZ white dwarf PM J08186-3110. High-dispersion spectra show the presence of Zeeman splitted spectral lines due to the presence of a surface average magnetic field of 92 kG. The strong magnesium and calcium lines show extended wings shaped by interactions with neutral helium in a dense, cool helium-rich atmosphere. We found that the abundance of heavy elements varied between spectra taken 10 years apart but we could not establish a time-scale for these variations; such variations may be linked to surface abundance variations in the magnetized atmosphere. Finally, we show that volume-limited samples reveal that about 40 per cent of DZ white dwarfs with effective temperatures below 7000 K are magnetic.

Original language	English
Pages (from-to)	2732-2740
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	500
Issue number	2
DOIs	https://doi.org/10.1093/mnras/staa3421
Publication status	Published - 1 Jan 2021

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title = "The nearby magnetic cool DZ white dwarf PM J08186-3110",

abstract = "We present an analysis of photometric, spectroscopic, and spectropolarimetric data of the nearby, cool, magnetic DZ white dwarf PM J08186-3110. High-dispersion spectra show the presence of Zeeman splitted spectral lines due to the presence of a surface average magnetic field of 92 kG. The strong magnesium and calcium lines show extended wings shaped by interactions with neutral helium in a dense, cool helium-rich atmosphere. We found that the abundance of heavy elements varied between spectra taken 10 years apart but we could not establish a time-scale for these variations; such variations may be linked to surface abundance variations in the magnetized atmosphere. Finally, we show that volume-limited samples reveal that about 40 per cent of DZ white dwarfs with effective temperatures below 7000 K are magnetic.",

keywords = "stars: atmospheres, stars: individual: PM J08186-3110, stars: magnetic field, white dwarfs",

author = "Adela Kawka and St{\'e}phane Vennes and Allard, {Nicole F.} and T. Leininger and Gad{\'e}a, {F. X.}",

note = "Publisher Copyright: {\textcopyright} 2020 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",

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doi = "10.1093/mnras/staa3421",

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T1 - The nearby magnetic cool DZ white dwarf PM J08186-3110

AU - Kawka, Adela

AU - Vennes, Stéphane

AU - Allard, Nicole F.

AU - Leininger, T.

AU - Gadéa, F. X.

PY - 2021/1/1

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AB - We present an analysis of photometric, spectroscopic, and spectropolarimetric data of the nearby, cool, magnetic DZ white dwarf PM J08186-3110. High-dispersion spectra show the presence of Zeeman splitted spectral lines due to the presence of a surface average magnetic field of 92 kG. The strong magnesium and calcium lines show extended wings shaped by interactions with neutral helium in a dense, cool helium-rich atmosphere. We found that the abundance of heavy elements varied between spectra taken 10 years apart but we could not establish a time-scale for these variations; such variations may be linked to surface abundance variations in the magnetized atmosphere. Finally, we show that volume-limited samples reveal that about 40 per cent of DZ white dwarfs with effective temperatures below 7000 K are magnetic.

KW - stars: atmospheres

KW - stars: individual: PM J08186-3110

KW - stars: magnetic field

KW - white dwarfs

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DO - 10.1093/mnras/staa3421

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

The nearby magnetic cool DZ white dwarf PM J08186-3110

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