标题： 恒星演化与旋转和磁场：III：环流与发电机的相互作用 显示英文标题

标题： Stellar evolution with rotation and magnetic fields:III: The interplay of circulation and dynamo

摘要： 我们研究了由Tayler-Spruit发电机在差速自转恒星中产生的磁场的影响。在恒星包层的大部分区域存在约$10^4$ G数量级的磁场，但外层除外。角动量输运的扩散系数非常大，在主序阶段施加接近刚体旋转。反过来，刚体旋转驱动比通常情况快得多的经向环流，并导致比化学物种磁扩散系数大得多的扩散系数。其结果是，热不稳定性和磁场不稳定性之间的相互作用有利于元素的化学输运，而在仅有磁场的情况下则不会有这种输运。我们还讨论了对恒星内部结构、寿命和赫罗图的影响。 显示英文摘要

摘要： We examine the effects of the magnetic field created by the Tayler--Spruit dynamo in differentially rotating stars. Magnetic fields of the order of a few $10^4$ G are present through most of the stellar envelope, with the exception of the outer layers. The diffusion coefficient for the transport of angular momentum is very large and it imposes nearly solid body rotation during the MS phase. In turn, solid body rotation drives meridional circulation currents which are much faster than usual and leads to much larger diffusion coefficients than the magnetic diffusivity for the chemical species. The consequence is that the interplay of the thermal and magnetic instabilities favours the chemical transport of elements, while there would be no transport in models with magnetic field only. We also discuss the effects on the stellar interior, lifetimes and HR diagram.