论文标题

银河H II地区SH2-242的年轻恒星种群的人口普查

Census of young stellar population in the Galactic H II region Sh2-242

论文作者

Panja, Alik, Mondal, Soumen, Dutta, Somnath, Joshi, Santosh, Lata, Sneh, Das, Ramkrishna

论文摘要

我们在这里介绍了与活跃的星形现场SH2-242相关的年轻恒星种群的鉴定和表征。我们使用了自己的新光学成像和光谱观察数据,以及几个档案目录,例如pan-starrs 1,$ gaia $ dr2,iphas,iphas,wircam,wircam,2mass和$ spitzer $。 SLIT光谱结果证实了主要电离源BD+26 980作为光谱型B0.5 V的早期型星的分类。恒星的分光光度计距离估计为2.08 $ \ pm $ 0.24 kpc,确认了源为群集的源。覆盖大面积的灭绝地图(直径$ \ sim $ 50')是$ h $和$ k $的光度法生成的。从地图中,第一次确定了峰灭绝配合物的三个不同位置($ a_ {v} $ $ \ simeq $ 7 $ - $ 17 mag)。使用红外颜色过量,该区域内总共将33个I类和137级II级幼体分类。 IPHES光度法揭示了36 H $α$发射源的分类,这可能是II类对象。在36 h $α$发射来源中,已经使用红外过量排放来确定5个。从这项研究中,总共将201个年轻物体分类为S242。 $ GAIA $ dr2目录中包含视差,进一步介绍了年轻资源的会员身份。使用光学和红外颜色磁性图,年轻的恒星对象的平均年龄为$ \ sim $ 1 MYR,群众在0.1 $ -3.0 $ 3.0 $ M_ \ odot $中。使用合并的光度和光谱数据讨论了该区域内恒星含量的普查。

We present here identification and characterization of the young stellar population associated with an active star-forming site Sh2-242. We used our own new optical imaging and spectroscopic observational data, as well as several archival catalogs, e.g., Pan-STARRS 1, $Gaia$ DR2, IPHAS, WIRCam, 2MASS, and $Spitzer$. Slit spectroscopic results confirm the classification of the main ionizing source BD+26 980 as an early-type star of spectral type B0.5 V. The spectrophotometric distance of the star is estimated as 2.08 $\pm$ 0.24 kpc, which confirms the source as a member of the cluster. An extinction map covering a large area (diameter $\sim$ 50') is generated with $H$ and $K$ photometry toward the region. From the map, three distinct locations of peak extinction complexes ($A_{V}$ $\simeq$ 7$-$17 mag) are identified for the very first time. Using the infrared color excess, a total of 33 Class I and 137 Class II young objects are classified within the region. The IPHAS photometry reveals classification of 36 H$α$ emitting sources, which might be class II objects. Among 36 H$α$ emitting sources, 5 are already identified using infrared excess emission. In total, 201 young objects are classified toward S242 from this study. The membership status of the young sources is further windowed with the inclusion of parallax from the $Gaia$ DR2 catalog. Using the optical and infrared color-magnitude diagrams, the young stellar objects are characterized with an average age of $\sim$ 1 Myr and the masses in the range 0.1$-$3.0 $M_\odot$. The census of the stellar content within the region is discussed using combined photometric and spectroscopic data.

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