基于Gaia DR3数据在Cygnus天区的星团群搜寻研究  

Search for Open Cluster Groups in the Cygnus Region Based on Gaia DR3 Data

作　　者：刘桂梅 钟靖[1] 单星美 秦松梅 李春燕 LIU Guimei;ZHONG Jing;SHAN Xingmei;QIN Songmei;LI Chunyan(Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Astronomy Museum(Branch of Shanghai Science and Technology Museum),Shanghai 201306,China)

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院大学,北京100049 [3]上海天文馆(上海科技馆分馆),上海201306

出　　处：《天文学进展》2025年第1期142-156,共15页Progress In Astronomy

基　　金：国家自然科学基金(12090040/12090042,12073060);中国科学院青年创新促进会;中国国家留学基金(202304910547)。

摘　　要：由于星团群样本数量以及数据精度的限制,星团群的起源机制尚不明确。因此,需要扩大原初星团群样本,为进一步研究星团的形成与演化提供可靠的观测数据。基于Gaia DR3数据,重新测定了以往报道的星团参数。根据星团的空间分布和运动学特征,在Cygnus天区发现了4个新的星团群:G1、G2、G3和G4。这4个星团群各自占据相对独立的空间,成员星团空间分布相互毗邻且速度一致,表明各自成员星团是在同一片巨分子云中形成的。各星团群恒星形成时间分别为13 Ma、29 Ma、10 Ma和12 Ma,符合连续恒星形成事件的持续时标,表明星团群成员是原初相继形成的。通过贝叶斯方法改正距离后,发现G1和G2星团群呈丝状分布,而G3和G4则较为集中。G1和G2中部分星团相互作用不明显,G3和G4中的星团存在明显的相互作用。最后,对于4个星团群在银河系中的轨道运动进行了分析,结果表明这4个星团群的成员星团将逐渐远离,最终演变成独立的星团。The formation mechanisms of open cluster groups remain unclear due to limited samples and data precision.Therefore,there is a need to expand the sample size of pri-mordial open cluster groups to provide reliable observational constraints for further studies on the formation and evolution mechanism of open clusters.Based on Gaia DR3 data,the parameters of previously reported open clusters have been redetermined.Four new open cluster groups,G1,G2,G3,and G4,were discovered in the Cygnus region based on the spatial distribution and kinematic properties.These four open cluster groups each occupy a distinct spatial region,with member clusters closely adjacent and exhibiting consistent velocities,indicating that they formed within the same giant molecular cloud.The star formation durations of the four open cluster groups are 13 Ma,29 Ma,10 Ma,and 12 Ma,respectively.These durations align with the timescales of continuous star formation events,suggesting that the members of the open cluster group may have formed sequentially.After distance correction using Bayesian methods,G1 and G2 exhibit lamentary distributions,while G3 and G4 are more concentrated.Additionally,some members in G1 and G2 show less apparent interactions,while those in G3 and G4 exhibit signi cant interactions.Finally,the analysis of the orbital motion of these four open cluster groups within the Milky Way indicates that their members will gradually disperse,eventually evolving into independent open clusters.

关 键 词：疏散星团 双星团 星团群 银河系 

分 类 号：P154.1[天文地球—天文学]