Additionally, if the X-ray source is in a binary system, the X-rays will be periodically cut off as the source eclipsed by the companion star.

另外，如果x射线源是一个双星系统，当x射线源被它的伴星所遮挡时，发出的x射线就会周期性地被切断。

youdao

This paper is contributed to the study of the light curve and periodicity of the black hole X-ray binary Cyg X-1.

本文主要致力于黑x射线双星光变曲线以及周期性特征的研究。

youdao

The black holes are separated by an estimated distance of less than a third of a light-year - cheek-to-cheek by black hole standards and significantly closer than the postulated binary system spotted by the Chandra X-ray Observatory in 2003.

BBC: Dancing black hole twins spotted