The variation of the orbital periods found in high-mass X-ray binaries occurring over time can be explained by two models. According to the first model, orbital decay occurs due to dynamic tidal forces. The second model shows that the change occurs due to the inertia moments of a massive star during its evolution. These models are applied to LMC X-4 and Cen X-3.

中文翻译：

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高质量X射线双星中的轨道衰减

在高质量X射线双星中发现的轨道周期随时间的变化可以用两个模型来解释。根据第一个模型，轨道衰减是由动态潮汐力引起的。第二个模型表明，变化是由于大质量恒星在演化过程中的惯性矩而发生的。这些模型适用于LMC X-4和Cen X-3。