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arXiv 2007.11211astro-ph.GA
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英仙座阿尔法星团与附近恒星流的关系

The relation of the Alpha Persei star cluster with the nearby stellar stream

Victoria V. Nikiforova, Maxim V. Kulesh, Anton F. Seleznev, Giovanni Carraro

备注：
14 pages, 12 figures, 3 tables. Accepted to The Astronomical Journal
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摘要：

从盖亚DR 2中提取的100度的地图，以英仙座阿尔法为中心，揭示了两个不同的结构|英仙座阿尔法星团和一个明显的恒星流，在最近的文献中被广泛记录。在这项工作中，我们使用DBSCAN来评估单个恒星的成员资格，并试图从一般领域中分离出属于星团和流的恒星。反过来，我们的流的特点，并调查其与集群的关系。溪流的种群比星团要老得多（5+/-1Gyr），并且在其背景中距离星团约90 pc。在视线方向上，该流显示出约180 pc的相当大的厚度。最后，这条星流中有大量的白矮星。我们估计流质量的上限约为6000太阳质量？。因此，这条星系流可能是一个相对巨大的古老星系团的残余。英仙座阿尔法星的表面密度图证明了潮汐尾的存在。虽然很容易将它们归因于与破坏性的旧星团的相互作用，但保守地说，我们更愿意相信它们是银河系的起源。

英文摘要：

A map of 100 degrees on a side extracted from Gaia DR2 and centred on Alpha Persei reveals two distinct structures | the Alpha Persei star cluster and a conspicuous stellar stream, as widely documented in recent literature. In this work we employ DBSCAN to assess individual stars' membership and attempt at separating stars belonging to the cluster and to the stream from the general field. In turn, we characterize the stream and investigate its relation with the cluster. The stream population turned out to be significantly older (5+/-1Gyr) than the cluster, and to be positioned ~90 pc away from the cluster, in its background. The stream exhibits a sizeable thickness of ~180 pc in the direction of the line of view. Finally, the stream harbours a prominent population of white dwarf stars. We estimated an upper limit of the stream mass of ~6000 solar masses?. The stream would therefore be the leftover of a relatively massive old cluster. The surface density map of the Alpha Persei evidences the presence of tidal tails. While it is tempting to ascribe them to the interaction with the disrupting old star cluster, we prefer to believe, conservatively, they are of Galactic origin.

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