大质量年轻星体的^(13)CO(1→0)谱线发射  

~13CO(1→0) LINE EMISSION FROM MASSIVE YONG STELLAR OBJECTS

作　　者：孙锦[1] 张燕平[1] 孙金江 

机构地区：[1]北京师范大学天文学系 [2]青海紫金山天文台青海观测站,德令哈817000

出　　处：《北京师范大学学报（自然科学版）》2000年第4期512-519,共8页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目!(19873003);中国科学院射电天文联合实验室资助项目

摘　　要：利用紫金山天文台青海站的 13.7m毫米波望远镜对 133个大质量年轻星体或其候选体进行了 13CO( 1→ 0 ) ( J=1→ 0 )的谱线观测 .在 115个源中观测到了 13CO( 1→ 0 )的发射 ,其中 94个天体是第一次探测到 13CO( 1→ 0 )谱线 .根据多样性的 13CO( 1→ 0 )谱线轮廓 ,分析了大质量年轻星成协分子云核的运动和结构 .用 L TE方法导出了每个被测源的 13CO( 1→ 0 )光学厚度和 H2 分子柱密度 .计算了 8个与大质量年轻星候选体成协分子云核的 mvir/mcl。Observations of 13 CO J =1→0 line emission toward 133 massive young stellar objects(YSOs) or its candidates were carried out by using the 13 7 m millimeter wave telescope of Purple Mountain Observatory. 115 observed objects show the 13 CO(1→0) emission. 94 of them were first detected in 13 CO(1→0) lines. The kinematics and structures of molecular cloud cores associated with massive YSOs were analyzed from the various 13 CO(1→0) line profiles. The 13 CO(1→0) optical depths and H 2 column densities were derived for all observed sources with LTE method. Besides, the ratio m vir / m cl for 8 cloud cores related to the massive YSOs candidates were calculated, and the stability of these cloud cores were discussed.

关 键 词：大质量星形成 分子云 谱线发射 年轻星体 

分 类 号：P145.3[天文地球—天体物理]