在Milky Way疏散星团的最后一口气抓住它
Catching a Milky Way open cluster in its last breath
摘要：
理论模型已经提出了特殊的速度分散分布的星团面临溶解。他们预测，除了仍然属于星团的束缚恒星和已经剥离的非束缚恒星外，还有一个中间的恒星群体，它们已经获得了足够的能量来逃离星团，仍然在星团的雅可比半径内。这两个，潜在的逃生者和未绑定的恒星，显示热运动学，没有观察到沿潮汐尾巴的星团。我们报告的第一个证据，一个疏散星团与恒星穿越这样一个过渡的情况下，即：ASCC 92。这个疏散星团聚集了其初始总质量的近10%，并且正在向受到更高星际吸收影响的银河系区域移动。准确地说，星系团模糊的外观可能阻碍了以前解开其真正的内部动力学进化阶段。
英文摘要：
Theoretical models have suggested peculiar velocity dispersion profiles of star clusters facing dissolution. They predicted that, besides bound stars that still belong to the star cluster, and unbound ones already stripped off, there is an intermediate population of stars that having acquired the enough energy to escape the cluster are still within the cluster Jacobi radius. Both, potential escapers and unbound stars, show hot kinematics, not observed along tidal tails of star clusters. We report on the first evidence of an open cluster with stars crossing such a transitional scenario, namely: ASCC 92. The open cluster gathers nearly 10 percent of its initial total mass, and is moving toward Galactic regions affected by higher interstellar absorption. Precisely, the obscured appearance of the cluster could have hampered disentangling its true internal dynamical evolutionary stage, previously.
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