标题： 关于双中子星的演化 显示英文标题

标题： On the Evolution of Binary Neutron Stars

摘要： 本文研究了双中子星的演化，即它们的磁场、自旋和轨道演化。 中子星的核心被认为是超流体、超导体II型。 之前的研究者已经讨论过单个中子星核心磁场的磁通排斥现象。 然而，对于双中子星而言，核心磁场的演化大不相同。 对于单个中子星，质子超导体的磁通总是向外移动通过核心，而在双中子星吸积阶段，磁通则向内移回核心。 核心磁场的增加导致表面磁场的增强。 我们探讨在这个模型框架下毫秒脉冲星（MSPs）的形成是否可能。 我们表明，尽管核心磁场有所增加，但在该模型中仍能形成MSPs。 数值研究了具有不同轨道周期、磁场、自转周期及其他参数的中子星的演化。 中子星的状态方程、双星系统的初始轨道周期以及其他参数对周期与磁场的关系演化有显著影响。 显示英文摘要

摘要： In this paper we investigate the evolution of binary neutron stars, namely, their magnetic field, spin, and orbital evolution. The core of a neutron star is considered to be a superfluid, superconductor type II. Flux expulsion of the magnetic field out of the core of a single neutron star has been discussed by previous authors. However, the evolution of the core magnetic field is substantially different for a binary neutron star. While for a single neutron star the fluxoids of the proton superconductor always move outward through the core, in a binary neutron star in the accretion phase fluxoids move back into the core. The subsequent increase of the core magnetic field results in the increase of the surface magnetic field. We ask weather within the framework of this model the formation of millisecond pulsars (MSPs) is possible. We show that despite the increase of the core magnetic field, MSPs are formed in this model. The evolution of the neutron star with various orbital periods, magnetic fields, spin periods, and other parameters are numerically investigated. The equation of state of the neutron star, initial orbital period of the binary, and other parameters of the binary have substantial effects on the evolution of period vs. magnetic field.