论文标题
在太阳能社区发现了一个年轻的恒星“蛇”，并有两个溶解的核心
Discovery of a young stellar "snake" with two dissolving cores in the solar neighborhood
论文作者
论文摘要
我们报告了一个从{\ it gaia} dr2的太阳邻域中发现的年轻（只有30-40 \，Myr）的蛇形结构（被称为恒星“蛇”）。该结构的平均距离与我们的PC约为310 \。长度和宽度都超过200 \，PC，但厚度仅为80 \，PC。 “蛇”有一个尾巴和两个溶解的核心，可以在6D相空间中明确区分。整个结构包括成千上万的成员，总质量大于2000 \，$ m _ {\ odot} $。人口非常年轻，以至于无法用潮汐尾巴的经典理论来很好地解释它。因此，我们怀疑“蛇”在层次上是原始的，而不是动态潮汐剥离的结果，即使“蛇”可能正在扩展。连贯的5D相信息和年龄表明，“蛇”可能与Beccari等人（2020年）的丝状结构相同。如果是这样，“蛇”可以将Vela OB2关联的天空区域扩展到$ \ sim 2 $，并补充其同时结构的人口普查。这一发现对于了解Vela OB2复合物的形成和演变历史很有用。 “蛇”的年龄与古尔德皮带的年龄相匹配。在我们感兴趣的天空区域中，我们发现了一个新的开放集群，该集群在这项工作中被命名为Tian 1。
We report the discovery of a young (only 30-40\,Myr) snake-like structure (dubbed a stellar "snake") in the solar neighborhood from {\it Gaia} DR2. The average distance of this structure is about 310\,pc from us. Both the length and width are over 200\,pc, but the thickness is only about 80\,pc. The "snake" has one tail and two dissolving cores, which can be clearly distinguished in the 6D phase space. The whole structure includes thousands of members with a total mass of larger than 2000\,$M_{\odot}$ in an uniform population. The population is so young that it can not be well explained with the classical theory of tidal tails. We therefore suspect that the "snake" is hierarchically primordial, rather than the result of dynamically tidal stripping, even if the "snake" is probably expanding. The coherent 5D phase information and the ages suggest that the "snake" was probably born in the same environment as the filamentary structure of Beccari et al.(2020). If so, the "snake" could extend the sky region of the Vela OB2 association by a factor of $\sim 2$, and supplement the census of its coeval structures. This finding is useful to understand the history of the formation and evolution of the Vela OB2 complex. The age of the "snake" well matches with that of the Gould Belt. In the sky region of our interest, we detect one new open cluster, which is named as Tian 1 in this work.
