金牛座、蛇夫座中分子云的热性质和年轻星体的演化状态  

Thermal Characters of Molecular Clouds and Evolutionary States of Young Stars in the Taurus and Ophiuchus

作　　者：吴京文[1] 吴月芳[1] 

机构地区：[1]北京大学地球物理学系

出　　处：《北京大学学报（自然科学版）》1999年第5期665-671,共7页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金;中科院射电天文联合实验室资助项目

摘　　要：运用 Ｃ Ｏ 分子谱线及红外天文卫星资料，求出了金牛座、蛇夫座核心２ 个恒星形成区的气体运动温度 Ｔｋ 和尘埃温度 Ｔｄ ，验证了尘埃加热分子云的基本条件；着重探讨了用 Ｔｄ 参量比较年轻星体演化状态的方法，得出蛇夫座核心区恒星比金牛座恒星年轻的初步结论。Gas kinetic temperature T k and dust temperature T \-d were obtained for the clouds in Ophiuchus and Taurus based on CO observation as well as IRAS data . The requested T \-d> T k for dust collision heating mechanism has been tested. The relationship between T \-d\, T bol and evolutionary stat es has been analyzed. Results show that young stars in Ophiuchus core are younge r than in those of Taurus, and IRAS colour temperature can be used to estimate t he evolutionary states of young stars as a whole.

关 键 词：星际分子 分子云 金牛座 热性质 蛇夫座 星体 

分 类 号：P155[天文地球—天文学]