论文标题
单星和LMXB机制中使用台面进化模型的磁制动
Magnetic braking with MESA evolutionary models in the single star and LMXB regimes
论文作者
论文摘要
磁制动在推动接近低质量二元系统的演变中具有重要作用，并在很大程度上影响了带有对流信封的低质量F-和更高版本的恒星的旋转速率。目前存在一些描述磁制动的处方，这些处方描述了磁制动。我们测试了两个低质量X射线二元轨道时期的四个磁制动处方，从银河系和单星旋转期间观察到了在开放式簇中观察到的。我们发现，数据有利于磁制动处方，该处方是从快速旋转速率快速过渡到临界数以下的饱和（效率低下）磁制动的快速过渡，这足以重现超紧凑的X射线二进制系统。在测试的四个处方中，这些条件是通过制动处方来满足的，该处方结合了高阶磁场拓扑对角动量损失的影响。所测试的制动处方都没有能够复制在700-1000 Myr左右的开放群集星中观察到的失速旋转，并带有Masses $ \ Lessim $ 0.8 $ \ rm \ rm m _ {\ odot} $。
Magnetic braking has a prominent role in driving the evolution of close low mass binary systems and heavily influences the rotation rates of low mass F- and later type stars with convective envelopes. Several possible prescriptions that describe magnetic braking in the context of 1D stellar evolution models currently exist. We test four magnetic braking prescriptions against both low mass X-ray binary orbital periods from the Milky Way and single star rotation periods observed in open clusters. We find that data favors a magnetic braking prescription that follows a rapid transition from fast to slow rotation rates, exhibits saturated (inefficient) magnetic braking below a critical Rossby number, and that is sufficiently strong to reproduce ultra compact X-ray binary systems. Of the four prescriptions tested, these conditions are satisfied by a braking prescription that incorporates the effect of high order magnetic field topology on angular momentum loss. None of the braking prescriptions tested are able to replicate the stalled spin down observed in open cluster stars aged 700 - 1000 Myr or so, with masses $\lesssim$ 0.8 $\rm M_{\odot}$.
