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A metal-poor compact HII region with a small, isolated, and dense young stellar cluster
Wang, JJ; Wei, JY; Hu, JY
2002-07-01
发表期刊ASTROPHYSICAL JOURNAL
卷号573期号:1页码:238-245
摘要IRAS 04000+5052 appears to be a single, somewhat extended red source on optical CCD images. From our infrared imaging observations, an infrared cluster consisting of 15 objects is discovered in this region. In this paper, by discussing and analyzing the observational results of near-infrared imaging, optical spectroscopy, and the (CO)-C-12 molecular line, together with IRAS and NRAO VLA Sky Survey (NVSS) data, we conclude that IRAS 04000+5052 is a compact H II region with a very young dense stellar cluster. The spectrum of the compact H II region shows that it is a metal- poor nebula, which has the lowest line ratio of [N II] /Halpha (similar to1/ 16.3) discovered in the H II regions of our Galaxy until now. There are three possible explanations. The first is a Herbig Be star model, the second suggests that the material constituting this nebula could come from some nearby external galaxy from accretion of galaxies, and the third suggests that the material was produced in the primeval phase of our Galaxy and has not been chemically contaminated much. There exists an undetected gap between K = 13.6 and the detection limit of 16.2 mag. We give two possible interpretations for this undetected gap; one is based on the star formation itself, and the other is a possible observational effect. This infrared cluster is a very small (0.83 pc [north-south] x 1.55 pc [east-west]) and isolated high-mass protostellar cluster, in which there is a B0.5-type star exciting the compact H II region. The derived heliocentric distance (similar to4.29 kpc) of IRAS 04000+5052 is twice as large as that of the Perseus arm. It is located far beyond the Perseus arm at the direction (l = 150.86).
关键词Hii Regions Ism : Abundances Stars : Formation
收录类别SCI
语种英语
WOS记录号WOS:000176340400023
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8511
专题空间科学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Beijing 100871, Peoples R China
3.Beijing Univ, Beijing Astrophys Ctr, Beijing 100871, Peoples R China
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Wang, JJ,Wei, JY,Hu, JY. A metal-poor compact HII region with a small, isolated, and dense young stellar cluster[J]. ASTROPHYSICAL JOURNAL,2002,573(1):238-245.
APA Wang, JJ,Wei, JY,&Hu, JY.(2002).A metal-poor compact HII region with a small, isolated, and dense young stellar cluster.ASTROPHYSICAL JOURNAL,573(1),238-245.
MLA Wang, JJ,et al."A metal-poor compact HII region with a small, isolated, and dense young stellar cluster".ASTROPHYSICAL JOURNAL 573.1(2002):238-245.
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