磁场对恒星结构演化的影响

The Effects of the Magnetic Field on the Stellar Structure and Evolution

近年来人们发现磁场对恒星结构和演化有着重要的影响。本文简述了磁场产生的发电机原理,即恒星对流区的α-Ω发电机和辐射平衡区Tayler-spruit磁场发电机。Maeder&Meynet(2005)根据Tayler-spruit磁场发电机研究了磁场对恒星结构和演化产生的影响。他们发现磁场极大地增加恒星内部各层之间的耦合,使得恒星内部为接近刚性转动,而无磁场的恒星其内部为高度的较差自转。同时有磁场的恒星模型其表面有较高的N,He等元素增丰,同时带来C,O元素的消耗。磁场还引起恒星内部子午环流,剪切湍流等物理过程的变化。

It is found that magnetic fields have an important effect on the stellar structure and evolution.The magnetic dynamos which include the α-Ω dynamo and Tayler-spruit dynamo are introduced in this paper.Maeder and Meynet（2005） have investigated the effects of the magnetic field on the stellar structure and evolution.They find that magnetic field intensifies the coupling of the layers in the stellar interior.The star which includes the magnetic field exhibits the rigid rotation whereas the model without magnetic exhibits the differential rotation.Furthermore,the models with the magnetic enhance the elements of He and N and deplete the elements of C and O.Magnetic fields make the variations of the circulation and the shear turbulence.