Abstract: The evolution of interaction binary star has been discussed in this paper. Lipunov et al.have concluded that there is at lest one pulsar-black hole system among about 700 pulsars, hence it is on the near future that this kind of pulsar should be discovered. The periods of the X-ray pulsars are much longer than that of radio pulsars, and this long-period-problem is also introduced.

Key words: neutron stars, X-ray pulsars

摘要： 详细介绍了中子星的吸积以及密近双星的演化。Lipunov等讨论了在密近双星的演化中形成射电脉冲星与黑洞组成的双星的可能性，结论是在大约700个射电脉冲星中，至少当发现一个位于脉冲星与黑洞组成的双星系统。现已发现700多颗射电脉冲星，因而这类射电脉冲星应当在不久的将来被发现。这种系统如果真的被发现，将会对证明黑洞的存在起键性作用，这必定是天体物理中的重大事件。与射电脉冲星(脉冲周期约小于5s)相比，X线脉冲星的脉冲周期要长得多(80%大于6s，近半数大于100s)。周期长的原因还是一个未解决的问题，文献中常称之为“长周期问题”。本文对此也进行了较详细的讨论。

关键词: 中子星, X射线脉冲星