标题： 探测宽轨道中子星双星的螺旋桨状态 显示英文标题

标题： Probing the propeller regime with wide neutron star binaries

摘要： 我们用模型模拟了双中子星宽双星系统的螺旋桨阶段持续时间，并计算了不同螺旋桨模型的吸积开始时间。 我们将我们的建模应用于共生X射线双星SWIFT J0850.8-4219。 除非一个非常缓慢的自旋衰减螺旋桨正在运行，否则在螺旋桨阶段找到类似SWIFT J0850.8-4219的系统是非常不可能的。 然后我们模拟了在具有类太阳伴星的双星系统中中子星的演化。 我们计算了对于哪些轨道分离和磁场强度，中子星可以在伴星仍然处于主序阶段时开始吸积。 我们证明了对于磁场强度为$B\lesssim10^{12}$~G的中子星，在轨道分离为$a\gtrsim 1$~AU的情况下不会进入螺旋桨阶段。 在缓慢的螺旋桨自旋衰减情况下，中子星永远不会开始吸积。 对于更快的螺旋桨自旋衰减情况，中子星是否开始吸积或者长时间停留在螺旋桨阶段取决于参数。 显示英文摘要

摘要： We model the duration of the propeller stage in wide binary systems with neutron stars and calculate the time of accretion onset for various propeller models. We apply our modeling to the symbiotic X-ray binary SWIFT J0850.8-4219. Unless a propeller with a very slow spin-down is operating, it is very improbable to find a system similar to SWIFT J0850.8-4219 at the propeller stage. Then we model the evolution of a neutron star in a binary with a solar-like companion. We calculate for which orbital separations and magnetic fields a neutron star can start to accrete while the companion is still on the Main sequence. We demonstrate that for the magnetic field $B\lesssim10^{12}$~G neutron stars at the orbital separation $a\gtrsim 1$~AU do not reach the propeller stage. In the case of a slow propeller spin-down, neutron stars never start to accrete. For the more rapid propeller spin-down, a neutron star can start to accrete or spend a long time at the propeller stage depending on the parameters.