标题： 新兴的大质量星团NGC 2244是孪生星团吗？ 显示英文标题

标题： Is the emerging massive cluster NGC 2244 a twin cluster?

摘要： 本文首次报道了对年轻疏散星团 NGC 2244 的近红外研究，该星团因其部分嵌入 Rosette 星云而广为人知。 基于空间完整的 2 微米全天巡天（2MASS），年轻的 OB 星团显示出明显的亚结构。 它被意外地解析为一个紧密的核心，与光学观测中大质量 OB 星的聚集情况相匹配，在其西边 6.6 秒差距处有一个卫星星团，核心正下方可能还有一个类似弧状结构的主要恒星聚合体。 这项红外研究对其年轻疏散星团的本质提供了多种新的更新信息，包括其中心位置、物理尺度和恒星群体。 质量大于 0.8 $M_{\odot}$的成员的盘分数达到了 $\sim 20.5\pm2.8%$。 因此，NGC 2244 是研究嵌入星团的一个独特例子。 显示英文摘要

摘要： We present in this paper the first near infrared study of the young open cluster NGC 2244, which is well known for its partially embedded nature in the Rosette Nebula. Based on the spatially complete 2 Micron All Sky Survey, the young OB cluster indicates apparent substructures. It is surprisingly resolved into a compact core that matches well the congregation of massive OB stars in the optical, a satellite cluster at a distance of 6.6 pc in its west and probably a major stellar aggregate resembling an arc in structure right below the core. This infrared study provides various new updates on its nature of the young open cluster, including its central position, physical scale and stellar population. A disk fraction of $\sim 20.5\pm2.8%$ is achieved for its members with masses above 0.8 $M_{\odot}$. NGC 2244 is hence a unique example for the study of embedded clusters.