恒星形成过程中的天体物理现象

The Astronomical Phenomena in the Process of Star Formation

恒星形成于分子云环境中。近30多年的观测研究使得天文学家对小质量恒星的形成有了相对明确的认识:小质量恒星通过坍缩、吸积和外向流的路标而形成。至于大质量恒星,其形成过程还存在着许多不确定因素,现有的观测证据表明:大质量恒星也可能通过坍缩、吸积和外向流的路标来形成,但也不排除在星团中通过中小质量恒星聚合而成的因素。大质量恒星形成与致密电离氢区(UCHII)成协较好,而与大质量恒星形成区成协的分子云环境中,既有大质量恒星也有小质量恒星形成。综述了恒星形成各个阶段的观测结果和研究现状以及成协的天体物理环境情况。未来的观测和研究重点在于:大质量恒星形成以及星团环境中的恒星形成。

It is well known that stars form in molecular clouds. Through almost 30 years' observation and study, astronomers come to a relatively clear agreement that low mass stars form by collapse, accretion and outflow. However, for massive star formation there still exist many indefinite factors. The observational results show that maybe massive stars form by collapse, accretion and outflow either, without excluding the possibility that massive stars form by coalescence. Low mass star forming regions include only low mass stellar objects, but massive star forming regions include not only massive stars but also low mass stars. Massive stars are associated with UCHII regions well in their embedded phase. This paper summarizes the results of observation and study for star formation in different phases. Massive star formation and star formation in star clusters will be very important in the future work.