论文标题
$μ$ tau协会：150 pc的60 Myr-over coeval组
The $μ$ Tau Association: A 60 Myr-Old Coeval Group at 150 pc from the Sun
论文作者
论文摘要
[缩写]我们对新确定的$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ \ sim $ \ sim $ 150 pc的分析，这是大型cas-tau结构的一部分，并与$α$ persei cluster共同移动。我们使用Gaia DR2数据和Banyan $σ$工具（Gagné等，2018）确定了500多名候选成员，我们根据其颜色 - 磁性图的经验比较与其他附近的年轻联想的经验比较，确定其人口的$ 62 \ pm 7 $ MYR的年龄。 MUTA与Kounkel＆Covey（2019）的Theia 160组有关，与Liu等人的E Tau组相对应。 （2020）。作为该分析的一部分，我们引入了一种基于光谱模板的迭代方法，以对GAIA DR2光度法的星际灭绝进行准确校正，这是由于其宽的光度带通道所需的。我们表明，与较老的恒星相比，MUTA的成员显示出预期的恒星活动速率和更快的旋转速率，并且文献测量值对K3型成员的锂等效宽度为9 G0的宽度与我们的年龄确定是一致的。我们表明，MUTA的当今质量功能与附近其他已知的年轻协会一致。我们将WD 0340+103识别为B2成员的热，巨大的白色矮人残留物，它仅270，000年前就离开了行星星云阶段，对MUTA的独立年龄约束占$ 60 _ { - 6}^{+8} $ MYR。
[Abbreviated] We present an analysis of the newly identified $μ$ Tau Association (MUTA) of young stars at $\sim$ 150 pc from the Sun that is part of the large Cas-Tau structure, coeval and co-moving with the $α$ Persei cluster. We identify more than 500 candidate members using Gaia DR2 data and the BANYAN $Σ$ tool (Gagné et al. 2018) and we determine an age of $62 \pm 7$ Myr for its population based on an empirical comparison of its color-magnitude diagram sequence with those of other nearby young associations. The MUTA is related to the Theia 160 group of Kounkel & Covey (2019) and corresponds to the e Tau group of Liu et al. (2020). As part of this analysis, we introduce an iterative method based on spectral templates to perform an accurate correction of interstellar extinction of Gaia DR2 photometry, needed because of its wide photometric bandpasses. We show that the members of the MUTA display an expected increased rate of stellar activity and faster rotation rates compared with older stars, and that literature measurements of the lithium equivalent width of nine G0 to K3-type members are consistent with our age determination. We show that the present-day mass function of the MUTA is consistent with other known nearby young associations. We identify WD 0340+103 as a hot, massive white dwarf remnant of a B2 member that left its planetary nebula phase only 270,000 years ago, posing an independent age constraint of $60_{-6}^{+8}$ Myr for the MUTA.
