论文标题
一个谨慎的故事：NGC 752的尾巴比声称的要长得多
A tale of caution: the tails of NGC 752 are much longer than claimed
论文作者
论文摘要
了解开放簇的潮汐尾巴的确切程度和内容为田径恒星如何填充银河系提供了有用的线索。我们使用GAIA EDR3数据重新分析了开放群集NGC 752周围的尾巴。与以前的分析相比，我们查看了群集周围的一个较宽的区域，并首先使用收敛点方法，并使用DBSCAN进行聚类分析。我们发现，位于433 PC且由Plummer剖面的433 PC的群集具有很长的不对称尾巴，在天空上延伸了260多个PC（从尖端到尖端） - 比以前想象的大四倍 - 并且包含两倍的恒星。用PETAR计算的数值模型是指导并确认我们的分析。尾巴遵循模型的预测，但是后尾似乎略微扭曲，可能表明集群具有复杂的银河相遇历史。我们在新开发的紧凑型收敛方法上采用另一种方法，我们可能会完全追踪群集的潮汐尾巴，覆盖数千颗parsecs和1,000多个恒星。因此，我们的分析打开了有关开放群集研究的新窗口，其潜力将通过未来的Gaia数据发布完全释放。
Understanding the exact extent and content of tidal tails of open clusters provide useful clues on how field stars populate the Milky Way. We reanalyse, using Gaia EDR3 data, the tails around the open cluster NGC 752. Compared to previous analyses, we look at a much wider region around the cluster and use first the convergent point method, coupled with a clustering analysis using DBSCAN. We find that the cluster, located 433 pc away and well described by a Plummer profile, has very long and asymmetric tails, extending more than 260 pc on the sky (from tip to tip) - four times larger than previously thought - and contains twice as many stars. Numerical models computed with PETAR serve as guide and confirm our analysis. The tails follows the predictions from models, but the trailing tail appears slightly distorted, possibly indicating that the cluster had a complicated history of galactic encounters. Applying an alternative method to the newly developed compact convergent method, we potentially trace the cluster's tidal tails to their full extent, covering several thousands of parsecs and more than 1,000 stars. Our analysis therefore opens a new window on the study of open clusters, whose potential will be fully unleashed with future Gaia data releases.
