论文标题
BE型高质量X射线二进制的特性和演变作为潜在的超X射线源
Characteristics and evolution of Be-type high mass X-ray binaries as potential Ultraluminous X-ray Sources
论文作者
论文摘要
一些超湿的X射线源（ULX）表现出X射线脉冲，其中心源被认为是中子星。还有人建议有些是带有BE型捐赠者的短暂来源。在这项研究中，我们使用BE型高质量X射线二进制（BEHMXB）的质量积聚模型来估计由BEHMXB引起的巨大X射线爆发的条件，超过了Eddington的发光度。此外，我们研究了可以将BehMXB视为瞬态ULX的持续时间，在二进制演变过程中，Eddington亮度高于Eddington的光度。结果表明，behmxbs可能是ulxs，典型的持续时间约为1 Myr。与附近观察到的BehMXB的比较表明，许多二元系统在进化过程中有可能成为ULX。特别是，当Be捐赠者的deccretion与轨道平面对齐时，BEHMXB系统倾向于成为ULX。由于BehmXB是非常普遍的对象，并且其中大量物体可能成为ULX，因此我们得出结论，观察到的ULX的合理部分可能由进化的Behmxbs组成。
Some ultraluminous X-ray sources (ULXs) exhibit X-ray pulses, and their central sources are thought to be neutron stars. It has also been suggested that some are transient sources with Be-type donors. In this study, we use the mass accretion model of a Be-type high mass X-ray binary (BeHMXB) to estimate the conditions under which a giant X-ray burst caused by a BeHMXB exceeds the Eddington luminosity. Moreover, we investigate the duration for which BeHMXBs can be observed as transient ULXs with bursts above the Eddington luminosity during binary evolutions. The results indicate that BeHMXBs could be ULXs for a typical duration of approximately 1 Myr. Comparisons with nearby observed BeHMXBs indicate that many binary systems have the potential to become ULXs during their evolution. Particularly, a BeHMXB system tends to become a ULX when the Be donor has a dense deccretion disc aligned with the orbital plane. Because BeHMXBs are very common objects and a significant number of them can become ULXs, we conclude that a reasonable fraction of the observed ULXs could consist of evolved BeHMXBs.
