论文标题
使用Dynamo模型对阳光恒星中的大小最小值进行建模
Modelling the occurrence of grand minima in sun-like stars using a dynamo model
论文作者
论文摘要
在这项工作中，我们使用一个太阳能巨星的运动动力学模型研究了Grand Minima发生的可变性和频率，该模型具有不同的旋转速率和对流区域的深度。我们从相应的流体动力学模型中指定了大规模流（差异旋转和子午循环）。我们在Babcock-Leighton源中包括随机波动，用于产生可变的恒星周期。我们观察到，快速旋转的恒星产生具有强磁场的高度不规则的循环，很少产生像脱落的大小最小的微米，而缓慢旋转的恒星（太阳及更长的旋转期）会产生较弱的强度和偶尔大小的平滑周期。通常，最小值的数量随旋转速率的降低而增加。这些结果可以通过以下事实来解释：随着旋转周期的增加，发电机的超临界性减小，而发电机更容易在此制度中产生扩展的大型最小值。
In this work, we have studied the variability and frequency of occurrence of the grand minima using kinematic dynamo models of one solar mass star with different rotation rates and depths of convection zones. We specify the large-scale flows (differential rotations and meridional circulations) from corresponding hydrodynamic models. We include stochastic fluctuations in the Babcock-Leighton source for the poloidal field to produce variable stellar cycles. We observe that the rapidly rotating stars produce highly irregular cycles with strong magnetic fields and rarely produce Maunder-like grand minima, whereas the slowly rotating stars (Sun and longer rotation period) produce smooth cycles of weaker strength and occasional grand minima. In general, the number of the grand minima increases with the decrease in rotation rate. These results can be explained by the fact that with the increase of rotation period, the supercriticality of the dynamo decreases, and the dynamo is more prone to produce extended grand minima in this regime.
