Research on Star Formation and Associated Gas DynamicalPhenomena

1.研究了旋转星际云的平衡结构，确定了平衡状态下云的最大质量。3.研究了星际云中磁场的耗散过程，发现在密度为n_H10^&lt；11&gt；cm^&lt；-3&gt；-3&gt；，当温度T超过约1000K时，恢复耦合。因此，云的初始磁通大部分在n_H5x10^&lt；11&gt；cm^&lt；-3&gt；和T 1000K之间丢失。4.研究表明，在考虑磁场湍流扩散效应的情况下，旋涡星系中的磁场是稳定的。5.通过对旋转收缩磁化云周围现象的计算机模拟，发现在恒星形成区发生了与观测到的类似的双极流动。6.研究了被气盘包围的恒星风的传播，目的是为了得到双极流。7.通过对一些双极分子流源的观测发现，流体具有旋转运动和壳层结构，中心物体伴随着一个旋转的圆盘。8.通过对一些恒星形成区的调查，新发现了21个双极流天体。

1. Equilibrium structure of rotating interstellar clouds has been investigated and the maximum mass of the cloud in equilibrium has been determined. 2. The stability of rotating clouds has been investigated by following the dynamical evolution of the cloud starting from the equilibrium state and it has been found that the cloud is unstble when the ratio of the semi-major axes exceeds about 4. 3. The dissipation processes of magnetic fields in the interstellar clouds have been investigated and it has been found that the magnetic field is well frozen to the gas at the density n_H 10^<11>cm^<-3>, decouples from the gas at n_H 5x10^<11>cm^<-3>, and recovers the coupling when the temperature T exceeds about 1000K. Therefore, most of the initial magnetic flux of the cloud is lost between the states of n_H 5x10^<11>cm^<-3> and T 1000K. 4. It has been shown that the steady magnetic field is maintained in the spiral galaxy if the effect of turbulent diffusion of magnetic fields is taken into account. 5. By computer simulations of the phenomena around a contracting magnetized cloud with rotation, the bipolar flows similar to the observed ones in the star-forming regions have been found to occur. 6. The propagation of the stellar wind from a star surrounded by a gaseous disk has been investigated intending to derive a bipolar flow. 7. It has been found by the observations of some bipolar molecular flow sources that the flow has a rotational motion and has a shell structure and the central object is accompanied with a rotating disk. 8. Twenty-one bipolar flow objects have been newly found by the survey of some star-forming regions.