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Detection of tidal tails around the open cluster M 67 using principal component analysis

机译：使用主成分分析检测开放簇M 67周围的潮汐尾

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摘要

In this paper we present an investigation of tidal tails around the old open cluster M 67 using Gaia-DR2. We identify likely extra-tidal stars around M 67 using principal component analysis (PCA) and a Gaussian mixture model (GMM). We find 1618 stars closely related to M 67, 85 of which are likely extra-tidal stars. We find clear evidence for the existence of two well-defined tidal tails emerging from M 67. The tidal tails extend out to projected distances of at least 2.degrees 5 (similar to 39 pc), which is more than twice as large as the tidal radius of the cluster. Based on LAMOST-DR5 data, we confirm that 13 extra-tidal stars have radial velocities and metallicities similar to those of the cluster. Furthermore, we also confirm that the extra-tidal stars cover a wide mass range of 0.2-1.1 M-circle dot, and nearly half the extra-tidal stars are less than 0.57 M-circle dot. The total mass of the extra-tidal stars is determined to be about 55 M-circle dot. We estimate a mass-loss rate of similar to 2.8 M-circle dot Myr(-1) for M 67. Possible origins of these extra-tidal stars are discussed.
机译：在本文中，我们使用Gaia-DR2展示了旧开放群体M 67周围的潮汐尾。我们使用主成分分析（PCA）和高斯混合模型（GMM）识别M 67周围的额外潮汐恒星。我们发现1618颗恒星与M 67,85密切相关，其中可能是潮流的星星。我们找到了从M 67出现的两个明确定义的潮汐尾部存在明确的证据。潮汐尾部延伸到投影到至少2的距离至少为2.degrees 5（类似于39个PC），这与集群的潮半径。基于LAMOST-DR5数据，我们确认了13个额外恒星具有与群集相似的径向速度和金属。此外，我们还证实了潮汐恒星覆盖了0.2-1.1 m圆点的宽量范围，近一半的潮汐恒星小于0.57 m圆点。额外潮星的总质量决定为约55米圆点。我们估计M 67类似于2.8 m圆点数（-1）的质量损失率。讨论了这些额外恒星的可能起源。

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