标题： 可能在巨型分子云 G174+2.5 中发生的连续恒星形成 显示英文标题

标题： A possible sequential star formation in the giant molecular cloud G174+2.5

摘要： 我们研究了与巨分子云G174 + 2.5中的四个H II区域Sh2-235、Sh2-233、Sh2-232和Sh2-231相关的14个嵌入星团（ECs）的性质。这些天体面向银河反中心投影，可能是收集和塌缩情景的一个可能例子。我们得出了这些ECs的天文学参数（年龄、消光、距离、核心和星团半径），并研究了它们参数之间的关系。参数通过去除背景场的2MASS颜色-亮度图（CMDs）和恒星径向密度剖面（RDPs）得出。这些年轻星团的CMDs特征为一条人口稀少的主序线和大量受消光差异影响的前主序星。ECs包括KKC 11、FSR 784、Sh2-235 E2、Sh2-235星团、Sh2-233SE星团、BDSB 73、Sh2-235B星团、BDSB 72、BDSB 71、Sh2-232 IR、PCS 2以及新发现的星团CBB 1和CBB 2。我们能够为样本中的所有ECs推导出基本参数。结构参数被推导出用于FSR 784、Sh2-235星团和Sh2-235E2。 显示英文摘要

摘要： We investigate the nature of 14 embedded clusters (ECs) related to a group of four H II regions Sh2-235, Sh2-233, Sh2-232, and Sh2-231 in the giant molecular cloud G174 + 2.5. Projected towards the Galactic anticentre, these objects are a possible example of the collect and collapse scenario. We derive astrophysical parameters (age, reddening, distance, core and cluster radii) for the ECs and investigate the relationship among their parameters. Parameters are derived with field decontaminated 2MASS colour-magnitude diagrams (CMDs) and stellar radial density profiles (RDPs). The CMDs of these young clusters are characterised by a poorly-populated main sequence and a significant number of pre-main sequence stars, affected by differential reddening. The ECs are KKC 11, FSR 784, Sh2-235 E2, Sh2-235 Cluster, Sh2-233SE Cluster, BDSB 73, Sh2-235B Cluster, BDSB 72, BDSB 71, Sh2-232 IR, PCS 2, and the newly found clusters CBB 1 and CBB 2. We were able to derive fundamental parameters for all ECs in the sample. Structural parameters are derived for FSR 784, Sh2-235 Cluster and Sh2-235E2.