AI 中文总结
结合Gaia天体测量与CO观测，首次系统分析H II区Sh 2-205周边恒星形成区的三维特征，发现其存在两期恒星形成，相关天体反馈或驱动其膨胀，为该区域演化提供新认识。
AI 中文摘要
结合盖亚（Gaia）对年轻恒星的天体测量数据与一氧化碳（CO）观测，我们首次对H II区Sh 2-205（S205）周边恒星形成区的结构、运动学及演化历史开展系统的三维分析。S205在全局及亚区尺度上均呈现复杂形态与连贯膨胀特征。我们识别出数颗O9-B1型恒星，以及一颗年龄为0.56百万年的脉冲星，二者大概率与该区域相关。动量估算显示，这些天体的反馈或许可解释观测到的整体膨胀现象。结合膨胀回溯分析与年轻星团的色-星等图拟合，结果表明该区域至少经历了两期恒星形成过程。这些结果揭示了S205复杂的恒星形成历史，并为其三维演化提供了新的见解。
英文摘要
Using Gaia astrometry of young stars combined with CO observations, we present the first systematic three-dimensional (3D) analysis of the structure, kinematics, and evolutionary history of the star-forming regions in the environs of the H II region Sh 2-205 (S205). S205 exhibits a complex morphology and coherent expansion on both global and subregional scales. We identify several O9-B1 stars and a 0.56 Myr old pulsar that are likely associated with the region. A momentum estimate suggests that feedback from these objects may account for the observed overall expansion. Trace-back analysis of the expansion, combined with color-magnitude diagram fitting for young star clusters, indicates at least two episodes of star formation. These results reveal a complex star-formation history of S205 and provide new insights into its 3D evolution.
Comments28 pages, 18 figures. Accepted for publication in ApJ
