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arXiv 2008.12607astro-ph.HEastro-ph.SR
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风馈高质量X射线双星中中子星的自旋演化

Spin evolution of neutron stars in wind-fed high mass X-ray binaries

Shigeyuki Karino

摘要:

OB型高质量X射线双星(HMXB)观测到的X射线脉冲周期一般大于100秒。认为中子星的强磁场与风物质的相互作用能产生如此长的脉冲周期。在这项研究中,我们遵循的自旋演化NS,考虑到之间的相互作用的磁场和风的物质。在这条线上,作为新的挑战,我们解决了中子星的磁场的演化的同时,我们还专注于风的施主属性的影响。结果得到了中子星在出生后处于喷射阶段一段时间,然后快速自旋下降,成为准平衡,并逐渐自旋上升的演化轨迹。这种演化与以前的研究相似,但我们发现其主导物理学取决于施主风的速度。当风速较大时,由于磁抑制作用,发生自旋下降,而在风速较小时,经典的螺旋桨效应和沉降的吸积壳会导致快速自旋下降。由于施主星的风速可能依赖于辐照的X射线亮度,因此风馈HMXB中中子星的自旋演化轨迹可能比我们想象的要复杂得多。

英文摘要:

The observed X-ray pulse period of OB-type high-mass X-ray binary (HMXB) pulsars are typically longer than 100 seconds. It is considered that the interaction between the strong magnetic field of neutron star and the wind matter could cause such a long pulse period. In this study, we follow the spin evolution of NS, taking into account the interaction between the magnetic field and wind matter. In this line, as new challenges, we solve the evolution of the magnetic field of the neutron star at the same time, and additionally we focus on the effects of wind properties of the donor. As the result, evolutionary tracks were obtained in which the neutron star spends some duration in the ejector phase after birth, then rapidly spins down, becomes quasi-equilibrium, and gradually spins up. Such evolution is similar to previous studies, but we found that its dominant physics depends on the velocity of the donor wind. When the wind velocity is fast, the spin-down occurs due to magnetic inhibition, while the classical propeller effect and settling accretion shell causes rapid spin-down in the slow wind accretion. Since the wind velocity of the donor could depend on the irradiated X-ray luminosity, the spin evolution track of the neutron star in wind-fed HMXB could be more complicated than considered.

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