As For The Research Of The Sidereal Molecular Jets

The research on formation and the evolvement of the star is one of theastrophysical basic topics. This topic can help us to catch on the evolvement and theconfiguration of the galaxy, and it relates to the formation of the star on the other hand,so the research on formation and the evolvement of the star is the vital hinge of theformation of the celestial bodies.Since 70's in 20 centuries, the research of the sidereal molecular jets became one ofthe important outlying realms of astrophysics. In the sidereal molecular jets there is themost primordial and palpable information for the sidereal evolvement and formation,which may lead to thorough understanding of the early history of the sidereal system.The research of the sidereal molecular jets mostly concentrate on the model of thesidereal molecular jets, its expulsion mechanism and its unusual shape, which adopt thenumerical emulation generally. The advantage of the numerical emulation can give aquantitative description, but can not give a qualitative description. We adopt thetheoretical analysis to study the sidereal molecular jets produced by a 3d coniform ansaelayer when the initial conditions are constant. The 3d coniform ansae layer is a model ofpredigestion. On the foundation of this research, we studied the sidereal molecular jetswhich transform with the time. At last we study the sidereal molecular jets produced bythe bowshock. The results are accord with the observation. This thesis is divided intofive Chapters totally.In Chapter 1, which systematically expound the research backdrop and itssignificance. Then introduce in detail the research status and the development trend ofthis important topic, and the representative research results. We put an emphasis on thebasic model of the sidereal molecular jets currently, the advantage and the shortage ofits model, and the problem which should be reconsidered.In Chapter 2, we adopt the hydromechanics to study the basic property of the sider-eal molecular jets produced by the 3d coniform ansae layer, such as the speed, density,dimension. Our research is divided into two aspects: the shock is adiabatic and the shoc-k is radiant. We carry on theoretical derivation firstly, then make constructs to analysis,at last we gain the regulations from the analysis. In addition to individual circumstance,our results are accord with the results of observation. Because of the complex results an-d a good many factors, then we make an appropriate simplification processing, the resu-lts after predigestion is consistent to the prevenient results. That is to say our simplifica-tion is reasonable.In Chapter 3, on the foundation of the sidereal molecular jets in the Chapter 2, weput an emphasis on discussion of the sidereal molecular jets which have timeevolvement. We choose the appropriate of parameters, and assume that the loss factor ofthe momentum is a constant, and assume that the velocity and the loss factor of the massof the slower solar wind is a constant. Under the simple condition, we carried on theanalysis of the sidereal molecular jets which have time evolvement. We gain therelation between each variable and time use the equation from Chapter 2, and draw therelation pictures between variables and time. In addition to individual circumstance, wefind that our results resemble the observational data.In chapter 4, we discuss the sidereal molecular jets accurately which produced bythe bow shock resemble the reality. Then we deeply discuss the incident shock and thereflected shock, and work out the equation and the critical position of the incident shockand the reflected shock. So we discuss the case when the eject angle is small, and the v-ariety and the relation of the variables in the adiabatic condition and radiant condition.Then we work out the speed of the shock. our results are accord with the results of obs-ervation. At last, we discuss the relation of the variables about the second jet source.The chapter 4 is conclusion and discussion. We summarized the importantconclusions obtained in the paper and put forward new questions awaited study in thefuture.