扩展OB协会的动态
The Dynamics of an Expanding OB Association
摘要：
我们提出了大规模的OB协会天鹅座OB 2的三维运动学观测，以确定负责破坏年轻星团的机制。这些观察所揭示的图片是一个高度亚结构化的，动态未混合的OB协会，不表现出婴儿死亡率或潮汐剥离理论预测的位置-速度相关性。这些观测似乎支持了恒星形成的层次结构。
英文摘要：
We present 3-dimensional kinematical observations of the massive OB association Cygnus OB2 to identify the mechanisms responsible for disrupting young star clusters. The picture revealed by these observations is of a highly-substructured, dynamically unmixed OB association that does not exhibit the position-velocity correlations predicted by the theories of infant mortality or tidal stripping. These observations would appear to support a picture of hierarchical star formation.
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