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 journalArticlepeer-review

    8 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 languageEnglish
    Pages (from-to)2732-2740
    Number of pages9
    JournalMonthly Notices of the Royal Astronomical Society
    Volume500
    Issue number2
    DOIs
    Publication statusPublished - 1 Jan 2021

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