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arXiv 2409.00714astro-ph.HE
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利用宽中子星双星系统探测螺旋桨机制

Probing the propeller regime with wide neutron star binaries

M. D. Afonina, S. B. Popov

AI总结:

本文通过模拟宽中子星双星系统中螺旋桨阶段的持续时间与吸积起始条件,并结合SWIFT J0850.8-4219的观测约束,揭示了磁场和轨道间距对中子星能否进入螺旋桨阶段及后续吸积演化的关键影响。

摘要:

我们模拟了含中子星的宽双星系统中螺旋桨阶段的持续时间,并针对不同的螺旋桨模型计算了吸积开始的时间。我们将模型应用于共生X射线双星SWIFT J0850.8-4219。除非存在一个自旋减慢非常缓慢的螺旋桨在起作用,否则在螺旋桨阶段发现类似SWIFT J0850.8-4219的系统的概率非常低。随后,我们模拟了中子星在与类太阳伴星构成的双星中的演化。我们计算了在伴星仍处于主序阶段时,中子星能够在哪些轨道间距和磁场条件下开始吸积。我们证明,对于磁场$B\lesssim10^{12}$~G的中子星,在轨道间距$a\gtrsim 1$~AU时不会进入螺旋桨阶段。在螺旋桨自旋减慢较慢的情况下,中子星永远不会开始吸积。对于螺旋桨自旋减慢较快的情况,中子星可以开始吸积,或者根据参数的不同在螺旋桨阶段停留很长时间。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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