Long-term cycles in cosmic X-ray sources

@article{Priedhorsky1987LongtermCI,
  title={Long-term cycles in cosmic X-ray sources},
  author={William C. Priedhorsky and Stephen S. Holt},
  journal={Space Science Reviews},
  year={1987},
  volume={45},
  pages={291-348}
}
Most of what we know about galactic X-ray binaries comes from their time variation, particularly periodic variations corresponding to neutron star rotation, and binary motion. Longer cycles or quasi-cycles are much harder to observe because of the shortage of instrumentation suitable for long-term monitoring. Nonetheless, cycle with periods up to a few years have been seen in several galactic binaries.Cycles of ∼ 30–300 days have been confirmed for four high-mass systems, LMC X-4, Her X-1… 

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