论文标题
γVEL簇和附近的Vela OB2关联的动力学
The dynamics of the γ Vel cluster and nearby Vela OB2 association
论文作者
论文摘要
附近OB关联中低质量恒星的运动学可以提供有关其起源和进化的线索。将第二盖亚数据发布中给出的精确位置，正确的动作和可视化结合在一起，以及在盎格鲁 - 澳大利亚望远镜的爱马仕光谱仪获得的径向速度测量中，我们有机会详细研究属于附近$γ$ Vela ob2的Vela ob2 Crosceass的低质量星星的动力学，以下是vela ob2 copercation Is Is Issed Is Is Isspodect。锂的存在用于确认我们目标的年轻人。我们根据Jeffries等人的成员资格概率将样本分为群集和关联种群。 2014年，它们的视差和运动学。我们发现，在所有三个轴上至少有4 $σ$显着性的OB关联人群中扩张的有力证据，尽管扩张尤其是各向异性的。我们在集群和关联分散理论的背景下讨论这些结果。
The kinematics of low-mass stars in nearby OB associations can provide clues about their origins and evolution. Combining the precise positions, proper motions and parallaxes given in the second Gaia Data Release with radial velocity measurements obtained with the Hermes spectrograph at the Anglo-Australian Telescope, we have an opportunity to study in detail the kinematics of low-mass stars belonging to the nearby $γ$ Vel cluster and the Vela OB2 association it is projected against. The presence of lithium is used to confirm the youth of our targets. We separate our sample into the cluster and association populations based on the membership probabilities of Jeffries et al. 2014, their parallaxes, and kinematics. We find strong evidence for expansion in the OB association population with at least 4$σ$ significance along all three axes, though the expansion is notably anisotropic. We discuss these results in the context of cluster and association dispersal theories.
