论文标题
附近的磁性酷DZ白矮人PM J08186-3110
The nearby magnetic cool DZ white dwarf PM J08186-3110
论文作者
论文摘要
我们介绍了附近，凉爽，磁性DZ白矮人PM J08186-3110的光度，光谱和光谱图数据的分析。高色散光谱显示出由于表面平均磁场为92 kg而存在Zeeman拆分光谱线。强镁和钙线显示出与中性氦气相互作用在浓密，凉爽的氦气大气中形成的延长翅膀。我们发现，在分开十年的光谱之间，大量的重元素有所不同，但我们无法为这些变化建立时间尺度。这种变化可能与磁化气氛中的表面丰度变化有关。最后，我们表明体积有限的样品表明，有效温度低于7000 K的有效温度的DZ白色矮人中约有40％是磁性的。
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 ten 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% of DZ white dwarfs with effective temperatures below 7000 K are magnetic.
