论文标题
在模拟辐射恒星层中通过发电机作用旋转
Spin-down by dynamo action in simulated radiative stellar layers
论文作者
论文摘要
恒星的演变受到其内部旋转动力学的影响，通过传输和混合机制，这些动力学知之甚少。磁场可以在运输角动量和化学元素中发挥作用，但是辐射恒星层中磁性的起源尚不清楚。使用全局数值模拟，由于产生磁发电机，我们确定了向湍流的亚临界过渡。我们的结果具有理论上托勒 - 支撑发电机机制的许多特性，这些特性强烈增强了辐射区域中角动量的转运。它生成深层环形场，这些场被恒星外层筛选。这种机制可以在辐射星内产生强烈的磁场，而表面上没有可观察到的磁场。
The evolution of a star is influenced by its internal rotation dynamics through transport and mixing mechanisms, which are poorly understood. Magnetic fields can play a role in transporting angular momentum and chemical elements, but the origin of magnetism in radiative stellar layers is unclear. Using global numerical simulations, we identify a subcritical transition to turbulence due to the generation of a magnetic dynamo. Our results have many of the properties of the theoretically-proposed Tayler-Spruit dynamo mechanism, which strongly enhances transport of angular momentum in radiative zones. It generates deep toroidal fields that are screened by the stellar outer layers. This mechanism could produce strong magnetic fields inside radiative stars, without an observable field on their surface.
