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K'-band polarimetric imaging of S 187 IR and S 233
Zhibo Jiang ; Yongqiang Yao ; Ji Yang ; Ishii, M. ; Nagata, T. ; Nakaya, H. ; Sato, S.
Source PublicationAstronomical Journal
AbstractK'-band polarimetric images of star-forming regions Sh2-187 IR and Sh2-233 are presented. In Sh2-187 IR, a bipolar, near-infrared nebula is observed around IRAS 01202+6133, with the southern part being bright and knotty, and the northern part being faint and filamentary. The polarization pattern shows that the nebula is illuminated by a single near-infrared source, which is associated with IRAS 01202+6133. A polarization disk is found around this source with the disk plane roughly perpendicular to the axis of the bipolar nebula. The authors conclude that this source is the driving source of the outflow in the region. Two nebulae are detected in the Sh2-233 region. Associated with a compact infrared cluster, Sh2-233 A is roughly round in shape and shows a weak polarization pattern. The Sh2-233 B nebula shows roughly elongated geometry in the east-west direction. The polarization vectors divide it into three parts. Each part has distinctly different polarization from the others. The northeastern part of Sh2-233 B exhibits a centrosymmetric polarization pattern around a centroid, at which the authors locate a deeply embedded source (DES) undetected in the K' band and shorter wavelengths. The DES is likely the exciting source of water masers and outflows in the Sh2-233 B region. The western part of the nebula shows a parallel polarization pattern, but the southeastern part displays very little polarization. Comparison of the morphology and polarization of the nebulae in different star-forming regions suggests a close relationship between the evolutionary sequence of the young stellar objects and the morphology of the associated nebulae
KeywordYoung Stellar Objects Molecular Outflow Sources Star-forming Regions Iras Point Sources H-ii Regions Polarization Maps Infrared Sources Bipolar Nebulae Hii-regions Irs
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Recommended Citation
GB/T 7714
Zhibo Jiang,Yongqiang Yao,Ji Yang,et al. K'-band polarimetric imaging of S 187 IR and S 233[J]. Astronomical Journal,2001,122(1):313-321.
APA Zhibo Jiang.,Yongqiang Yao.,Ji Yang.,Ishii, M..,Nagata, T..,...&Sato, S..(2001).K'-band polarimetric imaging of S 187 IR and S 233.Astronomical Journal,122(1),313-321.
MLA Zhibo Jiang,et al."K'-band polarimetric imaging of S 187 IR and S 233".Astronomical Journal 122.1(2001):313-321.
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