论文标题
pleiades还是不是？解决锂富集的状态HHJ339和HHJ430
Pleiades or Not? Resolving the Status of the Lithium Rich M Dwarfs HHJ339 and HHJ430
论文作者
论文摘要
Oppenheimer等。 （1997年）在葡萄糖中发现了两个M5矮人，几乎原始锂。这些恒星的质量不足以代表lithium耗尽边界的前缘（〜125 Myr）。这些恒星中增强锂的一种可能解释是，它们实际上不是疟原虫的成员，而是在投射对pleiades的预测中看到的年轻运动组的成员。我们已经使用了Gaia DR2的数据来确认这两颗恒星HHJ 339和HHJ 430确实不是Pleiades的成员。基于它们的空间运动，基于Gaia的CMD中的视差和位置，这两颗恒星很可能是大约40颗parsecs前景到Pleiades，并且年龄约为25 Myr。从运动学上讲，它们最好与32 Ori移动组相匹配。
Oppenheimer et al. (1997) discovered two M5 dwarfs in the Pleiades with nearly primordial lithium. These stars are not low enough in mass to represent the leading edge of the lithium depletion boundary at Pleiades age (~125 Myr). A possible explanation for the enhanced lithium in these stars is that they are actually not members of the Pleiades but instead are members of a younger moving group seen in projection towards the Pleiades. We have used data from Gaia DR2 to confirm that these two stars, HHJ 339 and HHJ 430, are indeed not members of the Pleiades. Based on their space motions, parallaxes and positions in a Gaia-based CMD, it is probable that these two stars are about 40 parsecs foreground to the Pleiades and have ages of ~25 Myr. Kinematically they are best matched to the 32 Ori moving group.
