磁场对双星吸积盘的影响研究

项目名称： 磁场对双星吸积盘的影响研究

项目编号： No.11303086

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 刘杰英

作者单位： 中国科学院云南天文台

项目金额： 28万元

中文摘要： 吸吸是天体物理中一个重要的过程。吸积盘存在于众多的天体层次中，如星系的中心、活动星系核、双星中的致密天体和原恒星周围都观测到吸积盘的存在。吸积盘吸积物质的同时释放引力能，产生出远远大于恒星核聚变产生的能量。在吸积盘研究中，有两个极困难问题始终受到关注：一是磁场的产生机理。二是盘中的角动量转移和物质转移，它对盘的辐射性质和吸积率有重要影响。但是，如何将同时含有时间和空间变量的磁流体动力学方程组，研究磁场对角动量转移和物质转移的影响，是极困难的。 本项目主要研究双星通过物质交换，在致密天体周围形成的吸积盘。具体将依据由于吸积盘转动的环形电流产生磁场，结合角动量和能量守恒，避开繁琐的磁流体动力学方程组，研究盘中的磁场产生的机理以及磁场对角动量转移和物质转移的影响，并且计算理论模型的辐射谱与观测对比，进一步限制模型。

中文关键词： 吸积盘；活动星系核；X-射线；红外；

英文摘要： Accretion is one of the most important physical processes in astrophysics. Accretion disk surrounds the centre of galaxies，active galactic nuclei, compact objects in binaries and protostellars. The accreted materials go into the central object through losing angular momentum. And at the same time, the accreted materials liberate their gravitational energy which is significantly greater than that liberated by the nuclear fusion. There are two most difficult issues in study of accretion disk. The first issue is that what the generation mechanism of the magnetic field is. The transport of angular momentum and materials in the disk plays an important role in radiation and accretion rate. However,in order to study the effect of magnetic fields on the transport of angular momentum and materials, how to solve the magnetohydrodynamics equations which contain both time and space variables is another difficult issue. The aim of this project is to study the compact object's accretion disk forming through the mass change in binaries. We suppose that the magnetic field is generated through electriferous accretion flows circling the central objects. We don't consider the complicated magnetohydrodynamics equations, but combine the conservation of energy and angular momentum to investigate the effect of magnetic field on the

英文关键词： accretion disk；active galactic nuclei；X-ray；infrared；