论文标题
关于恒星协会的起源
On the origin of stellar associations
论文作者
论文摘要
在这篇评论中，我讨论了以银河系形成的OB关联形成的不同理论，并提供了支持它们的观察证据。实际上，GAIA Astreatric Data的第二版（2018年4月）正在彻底改变该领域，因为它使我们能够通过提供精确的距离和可靠的成员评估来揭开具有前所未有的细节的恒星关联的3D结构和运动学。作为说明，我总结了一些有关三个OB关联的最新研究：Cygnus ob2，vela ob2和天蝎座OB1，更详细地专注于SCO OB1。一项多波长的研究与Gaia DR2的星体和运动学数据同时，至少在这种情况下，似乎为恒星形成不是整体的情况提供了支持。事实上，除了一个明显的恒星簇NGC 6231和非常稀疏的星形簇trumpler 24之外，整个关联中还有几个较小的年轻OB和前序列序列星，这表明恒星形成是高度结构化的，没有首选。预计将有很多期待的Gaia数据发布的新革命。
In this review I discuss different theories of the formation of OB associations in the Milky Way, and provide the observational evidences in support of them. In fact, the second release of Gaia astrometric data (April 2018) is revolutionising the field, because it allows us to unravel the 3D structure and kinematics of stellar associations with unprecedented details by providing precise distances and a solid membership assessment. As an illustration, I summarise some recent studies on three OB associations: Cygnus OB2, Vela OB2, and Scorpius OB1, focussing in more detail to Sco OB1. A multi-wavelength study, in tandem with astrometric and kinematic data from Gaia DR2, seems to lend support, at least in this case, to a scenario in which star formation is not monolithic. As a matter of fact, besides one conspicuous star cluster, NGC 6231, and the very sparse star cluster Trumpler 24, there are several smaller groups of young OB and pre-main sequence stars across the association, indicating that star formation is highly structured and with no preferred scale. A new revolution is expected with the incoming much awaited third release of Gaia data.
