一个与HD 141569相关的同时代共动群体的调查
A Survey for a Coeval, Comoving Group Associated with HD 141569
摘要：
我们目前的搜索结果与恒星HD 141569，附近的一个孤立的Herbig AeBe主要成员的一个5+/-3百万岁的三星系统的斯科-岑复杂的郊区的年轻恒星运动组。我们的光谱测量确定了21颗富锂的恒星，年龄小于3000万年，在HD 141569的30度范围内，拥有与恒星相似的自行。然而，这些富锂恒星的空间分布并不意味着有一个与HD 141569三联体相关的移动星群，而是这个样本与上天蝎座和上半人马座狼疮同空间。我们应用一个修改后的移动集群视差的方法来比较这些年轻的恒星与上天蝎座和上半人马座狼疮的运动学。上天蝎座的八个新的潜在成员和上半人马座狼疮的五个新的潜在成员被确定。在HD 141569的15度（~30 pc）范围内没有发现一个可识别的核的实质性移动群。很明显，HD 141569系统形成于约500万年前，相对孤立，距离蛇夫座-天蝎座-半人马座区域最近的恒星形成地点有数十秒差距。
英文摘要：
We present results of a search for a young stellar moving group associated with the star HD 141569, a nearby, isolated Herbig AeBe primary member of a 5+/-3 Myr-old triple star system on the outskirts of the Sco-Cen complex. Our spectroscopic survey identified a population of 21 Li-rich, <30 Myr-old stars within 30 degrees of HD 141569 which possess similar proper motions with the star. The spatial distribution of these Li-rich stars, however, is not suggestive of a moving group associated with the HD 141569 triplet, but rather this sample appears cospatial with Upper Scorpius and Upper Centaurus Lupus. We apply a modified moving cluster parallax method to compare the kinematics of these youthful stars with Upper Scorpius and Upper Centaurus Lupus. Eight new potential members of Upper Scorpius and five new potential members of Upper Centaurus Lupus are identified. A substantial moving group with an identifiable nucleus within 15 degrees (~30 pc) of HD 141569 is not found in this sample. Evidently, the HD 141569 system formed ~5 Myr ago in relative isolation, tens of parsecs away from the recent sites of star formation in the Ophiucus-Scorpius-Centaurus region.
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