High‐proper‐motion white dwarfs and halo dark matter
High‐proper‐motion white dwarfs and halo dark matter
复制标题
高自行白矮星和晕暗物质
DOI：
10.1046/j.1365-8711.2002.05830.x
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发表时间：
2002
影响因子：
4.8
通讯作者：
J. Isern
中科院分区：
文献类型：
--
作者：
S. Torres;E. García–Berro;A. Burkert;J. Isern
奥本海默等人最近发现的古老而凉爽的白色矮星的解释仍然存在争议。尽管这些作者声称他们最终发现了难以捉摸的古希腊白色矮星群，它们对星系晕的质量收支有重要贡献，但也有其他一些贡献认为这些白色矮星不是真正的晕成员，而是厚盘恒星。我们在这里表明，这个样本的解释是基于所采用的距离，这是从色星等校准获得的，我们证明，当使用正确的距离时，这些假定的晕白色矮星的相当大的一部分确实属于盘人口。我们还进行了最大似然分析的其余一组白色矮星，我们发现，他们最有可能属于厚盘人口。然而，另一种可能的解释是，这个白色矮星的样本是从光环和圆盘白色矮星种群的1：1混合物中提取的。
The interpretation of the old, cool white dwarfs recently found by Oppenheimer et al. is still controversial. Whereas these authors claim that they have finally found the elusive ancienthalo white dwarf population that contributes significantly to the mass budget of the galactic halo, there have been several other contributions that argue that these white dwarfs are not genuine halo members but, instead, thick-disc stars. We show here that the interpretation of this sample is based on the adopted distances, which are obtained from a colour‐magnitude calibration, and we demonstrate that when the correct distances are used a sizeable fraction of these putative halo white dwarfs belong indeed to the disc population. We also perform a maximum likelihood analysis of the remaining set of white dwarfs and we find that they most probably belong to the thick-disc population. However, another possible explanation is that this sample of white dwarfs has been drawn from a 1 : 1 mixture of the halo and disc white dwarf populations.