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arXiv 1806.07571astro-ph.GA
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星团MCM2005b77中恒星形成区GRS G331 .34 $-$ 00.36(S62)和GRS G337 .92 $-$ 00.48(S36)中大质量恒星的探测

Detections of massive stars in the cluster MCM2005b77, in the star-forming regions GRS G331.34$-$00.36 (S62) and GRS G337.92$-$00.48 (S36)

Maria Messineo, Karl M. Menten, Donald F. Figer, C. -H. Rosie Chen, R. Michael Rich

摘要:

银河平面的大型红外和毫米波长调查已经揭示了600多个新的气泡HII区域和3000多个候选星团。我们提出了一个研究的候选团簇MCM 2005 b72,DBS 2003 -157,DBS 2003 -172,和MCM 2005 b77,根据近红外光谱与SofI采取的NTT和红外测光从2 MASS,VVV,和GLIMPSE调查。发现(1)MCM 2005 b72和DBS 2003 -157是同一恒星形成区HII GRS G331.34-00.36(气泡S62)的子区。MCM 2005 b72与这个HII区域的中心部分重合,而DBS 2003 -157是S62壳层的明亮中红外结。我们探测到了两颗消光为\Aks =1.0-1.3等的O型星,它们的光度特征与GRS G331.34-00.36的近运动学距离3.9 pm 0.3 kpc相一致。(2)DBS 2003 -172与S36壳层(GRS G337.92-00.48)中的一个明亮的中红外结相吻合,在那里我们发现了一对嵌入在小彗星星云中的候选He I星。(3)星团MCM 2005 b77富含B型恒星,平均Aks为0.91等,邻近HII区IRAS 16137-5025。平均分光光度距离为$\sim 5.0$ kpc,与IRAS 16137-5025的近运动学距离(5.2 pm 0.1 kpc)相匹配。

英文摘要:

Large infrared and millimeter wavelength surveys of the Galactic plane have unveiled more than 600 new bubble HII regions and more than 3000 candidate star clusters. We present a study of the candidate clusters MCM2005b72, DBS2003-157, DBS2003-172, and MCM2005b77, based on near-infrared spectroscopy taken with SofI on the NTT and infrared photometry from the 2MASS, VVV, and GLIMPSE surveys. We find that (1) MCM2005b72 and DBS2003-157 are subregions of the same star-forming region, HII GRS G331.34-00.36 (bubble S62). MCM2005b72 coincides with the central part of this HII region, while DBS2003-157 is a bright mid-infrared knot of the S62 shell. We detected two O-type stars at extinction \Aks=1.0-1.3 mag. Their spectrophotometric properties are consistent with the near-kinematic distance to GRS G331.34-00.36 of 3.9pm0.3 kpc. (2) DBS2003-172 coincides with a bright mid-infrared knot in the S36 shell (GRS G337.92-00.48), where we detected a pair of candidate He I stars embedded in a small cometary nebula. (3) The stellar cluster MCM2005b77 is rich in B-type stars, has an average Aks of 0.91 mag, and is adjacent to the HII region IRAS 16137-5025. The average spectrophotometric distance of $\sim 5.0$ kpc matches the near-kinematic distance to IRAS 16137-5025 of 5.2pm0.1 kpc.

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