不同类别分子区域中的CO辐射巡测  

A SURVEY OF CO EMISSION IN MOLECULAR REGIONS OF DIFFERENT TYPES

作　　者：吴月芳[1] 韩溥[2] 吕静[2] 孙金江[2] 雷成明[2] 

机构地区：[1]北京大学地球物理系 [2]中国科学院紫金山天文台青海观测站,德令哈817000

出　　处：《天文学报》1998年第3期244-250,共7页Acta Astronomica Sinica

基　　金：国家自然科学基金

摘　　要：用紫金山天文台青海观测站13．7米毫米波望远镜新安装的3毫米系统，对一组包括大质量恒星形成区、稠密云核、Bok球、主序前发射线星和演化晚期恒星的源进行了12COJ＝1－0的辐射搜寻．结果在不同质量恒星形成区域全部测到了12CO辐射，并发现了大的线宽、红和蓝的线翼、线心速度变化及多重辐射的特征，表明相应源可能具有双极喷流，存在膨胀、旋转或多核斑结构．有两个演化晚期星中已观测到了12COJ＝1－0谱线，说明其具有较浓厚的拱星气体包层．By using a recently installed system on the 13.7m radio telescope of the Qinghai Station of Purple Mountain Observatory in Deliha, the 12CO J =1-0 emission was searched in a group of sources, including HII region candidates, dense cores, Bob globule, pre-main sequence san and late-type stars. 12 CO J=1-0 lines were detected in all star-forming regions. Large line widths, blue and red wings as well as velocity shifts were also discovered in these clouds. These features imply that bipolar outflows, expanding gas, rotation and multiple clump structures are possibly present in the corresponding sources. The primary results also show that 12CO J=1-0 radiation exists in the envelopes of t2o late-type stars.

关 键 词：星际分子 星际介质 拱星包层 分子区域 CO辐射 

分 类 号：P155.22[天文地球—天文学]