论文标题
关于PSR J1640+2224的形成：中子星出生的巨大？
On the formation of PSR J1640+2224: a neutron star born massive?
论文作者
论文摘要
PSR J1640+2224是带有白矮人（WD）伴侣的二元毫秒脉冲星（BMSP）。最近的观察结果表明，WD很可能是$ \ sim 0.7 \，m _ {\ odot} $ co wd。因此，BMSP应该是从中间质量X射线二进制（IMXB）演变而来的。但是，先前对IMXB进化的研究预测，与PSR J1640+2224的175天轨道时期相比，所得BMSP的轨道周期通常为$ <40美元。在本文中，我们探讨了中子星（NS）的质量和伴侣星对BMSP形成的化学组成的影响。我们的结果表明，随着NS质量的增加，最终的轨道周期变长，并且WD质量随着金属性的降低而变得更大。特别是，为了重现PSR J1640+2224的属性，NS可能是天生的（$> 2.0 \，m _ {\ odot} $）。
PSR J1640+2224 is a binary millisecond pulsar (BMSP) with a white dwarf (WD) companion. Recent observations indicate that the WD is very likely to be a $\sim 0.7\,M_{\odot}$ CO WD. Thus the BMSP should have evolved from an intermediate-mass X-ray binary (IMXB). However, previous investigations on IMXB evolution predict that the orbital periods of the resultant BMSPs are generally $<40$ days, in contrast with the 175 day orbital period of PSR J1640+2224. In this paper, we explore the influence of the mass of the neutron star (NS) and the chemical compositions of the companion star on the formation of BMSPs. Our results show that, the final orbital period becomes longer with increasing NS mass, and the WD mass becomes larger with decreasing metallicity. In particular, to reproduce the properties of PSR J1640+2224, the NS was likely born massive ($>2.0\,M_{\odot}$).
