论文标题
基于Gaia Edr3的开放群集硬币-GAIA 13周围的扩展结构的发现
Discovery of extended structure around open cluster COIN-Gaia 13 based on Gaia EDR3
论文作者
论文摘要
Coin-Gaia 13是Gaia DR2数据揭示的新发现的开放群集。它是一个附近的开放群集，距离约为513 PC。与Gaia EDR3的五维星体数据相结合，我们使用会员分配算法（PyupMask）来确定在大型扩展空间区域中Coin-Gaia 13的成员。该集群找到了478名候选人。在获得可靠的群集成员后，我们进一步研究了其基本特性和空间分布。我们的结果表明，X-Y平面中群集的扩展结构明显。这种细长的结构沿着螺旋臂分布，整个长度约为270 pc。群集年龄为250 MYR，总质量约为439 m $ _ \ odot $，群集的潮汐半径约为11 pc。由于超过一半的成员恒星（352颗恒星）位于潮汐半径两倍之外，因此怀疑该群集正在进行动态溶解过程。此外，空间分布和运动学分析表明，硬币13中的扩展结构更可能是由星系的差异旋转引起的。
COIN-Gaia 13 is a newly discovered open cluster revealed by Gaia DR2 data. It is a nearby open cluster with a distance of about 513 pc. Combined with the five-dimensional astrometric data of Gaia EDR3 with higher accuracy, we use the membership assignment algorithm (pyUPMASK) to determine the membership of COIN-Gaia 13 in a large extended spatial region. The cluster has found 478 candidate members. After obtaining reliable cluster members, we further study its basic properties and spatial distribution. Our results show that there is an obvious extended structure of the cluster in the X-Y plane. This elongated structure is distributed along the spiral arm, and the whole length is about 270 pc. The cluster age is 250 Myr, the total mass is about 439 M$_\odot$, and the tidal radius of the cluster is about 11 pc. Since more than half of the member stars (352 stars) are located outside twice the tidal radius, it is suspected that this cluster is undergoing the dynamic dissolution process. Furthermore, the spatial distribution and kinematic analysis indicate that the extended structure in COIN-Gaia 13 is more likely to be caused by the differential rotation of the Galaxy.
