IRAS 20231+3440区外流激发源的性质研究  

Properties of the Exciting Source of the Outflow in IRAS 20231+3440 Region

作　　者：江治波[1] 杨戟[1] 姚永强[1] Miki Ishii 毛瑞青[1] 

机构地区：[1]中国科学院紫金山天文台,南京210008 [2]National Astronomical Observatories of Japan Mitaka Tokyo 181-8588,Japan

出　　处：《天文学报》2004年第2期132-140,共9页Acta Astronomica Sinica

基　　金：国家自然科学基金10133020

摘　　要：给出红外点源IRAS20231+3440附近恒星形成区近红外JHK’和H_2成像观测结果,以及与该IRAS点源成协的近红外点源IRS1的K波段分光观测结果。JHK’观测显示该区域存在嵌埋的年轻星天体,H_2窄波段观测揭示了若干个氢分子发射结点,其中有几个结点排列成线形,暗示分子氢喷流的存在。喷流的北部与已知观测的分子外流成协,表明二者之间存在联系。喷流的走向提示IRS1可能是其激发源,对IRS1的K波段分光观测给出了进一步的证据。从近红外、MSX及IRAS资料估计出IRS1的能谱分布,表明它是一个处于ClassⅠ状态的中等质量的年轻星天体。By using wide and narrow-band filters the near-infraed images of JHK' and Hz 2.1μm emission are presented towards the star forming region near the IRAS point source 20231+3440. The H_2 narrow-band filter, and the K band spectrum of bright near-infrared source IRS1 is also presented. JHK' images indicate the presence of embedded young stellar objects. The narrow-band H_2 image reveals several emission knots. Some knots are linearly aligned implying the existence of a molecular hydrogen jet, the northern part of which is as- sociated with a known molecular outflow, indicative of their physical relation. The tendency of the jet suggests that IRS1 might be the exciting source of this jet. The K band spectrum of IRS1 gives further evidence. The energy spectrum of IRS1 obtained from near-infrared, MSX and IRAS observations indicates that it is a intermediate-mass, Class I young stellar object.

关 键 词：恒星 星际介质 外流激发源 分子氢 谱线 谱带 

分 类 号：P152[天文地球—天文学]