Near-infrared polarimetric and spectrometric study of the massive star-forming region S87

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 分子云与恒星形成研究团组

	Near-infrared polarimetric and spectrometric study of the massive star-forming region S87
	Chen, X ; Yao, Y ; Yang, J; Jiang, Z ; Ishii, M
刊名	ASTRONOMY & ASTROPHYSICS
	2004-12-01
卷号	428 期号:2 页码:523-533
关键词	ISM : individual : objects S87 ISM : lines and bands polarization stars : formation instrumentation : polarimeters
ISSN号	0004-6361
英文摘要	We present JHK' imaging polarimetry for the massive star-forming region S87, and K-band spectrometry from 2.0 to 2.35 mum for several infrared sources in the region. The polarimetric patterns of S87E reveal a deeply embedded source (DES-S87) associated with reflection nebulosities. Exciting OH maser and 1.3 mm dust continuum emission, the DES-S87 is suggested to be the youngest star in S87 and the driving source of bipolar CO outflow in the region. A blue cavity is discovered in the [J-K'] color image, to the southwest of DES. Radial dependence of polarization degrees in the cavity could be fitted to the slab model of outflows at an inclination of similar to60degrees out of the plane of the sky (Minchin et al. 1991b). The nebular complex of S87E can be divided into three area. The North nebula, exhibiting a bipolar structure, may represent a bipolar outflow in the northwest-southeast direction. The southwest nebula traces the blueshifted CO outflow and corresponds to the cavity structure discovered in the [J-K'] color image. The nebular structure of S87E suggests a quadrupolar outflow driven by DES-S87. A well-defined centrosymmetric pattern is found in the nebula of S87W with high degrees of polarization, which indicates single scattering off small dust grains in the reflection nebula. The polarimetric vectors around NIRSA show a polarization disk feature oriented in the southeast-northwest direction. Strong Brgamma emission and H-2 emissions are found in the K-band spectra, indicating the presences of strong stellar wind, envelope/disk, shocked gas, and high-density PDRs in the circumstellar environment of S87E and S87W. According to the K-band spectrum, the mass of DES-S87E is estimated to be 20 M-circle dot.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	YOUNG STELLAR OBJECTS ; H-II REGIONS ; MOLECULAR-HYDROGEN EMISSION ; DEEPLY EMBEDDED SOURCE ; IMAGING POLARIMETRY ; POLARIZATION MAPS ; K-BAND ; REFLECTION NEBULAE ; MULTIPOLAR OUTFLOW ; BIPOLAR NEBULAE
收录类别	SCI
语种	英语
WOS记录号	WOS:000225335100016
公开日期	2012-12-22
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/7691]
专题	紫金山天文台_分子云与恒星形成研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Natl Astron Observ Japan, Mitaka, Tokyo 181, Japan
推荐引用方式 GB/T 7714	Chen, X,Yao, Y,Yang, J,et al. Near-infrared polarimetric and spectrometric study of the massive star-forming region S87[J]. ASTRONOMY & ASTROPHYSICS,2004,428(2):523-533.
APA	Chen, X,Yao, Y,Yang, J,Jiang, Z,&Ishii, M.(2004).Near-infrared polarimetric and spectrometric study of the massive star-forming region S87.ASTRONOMY & ASTROPHYSICS,428(2),523-533.
MLA	Chen, X,et al."Near-infrared polarimetric and spectrometric study of the massive star-forming region S87".ASTRONOMY & ASTROPHYSICS 428.2(2004):523-533.