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Published online by Cambridge University Press: 12 April 2016
There are at least five types of variable galactic X-ray sources (i. e. „stars“) known:
Pulsar, as NP0532
Transient Sources as Cen XR-2
Quasi-periodic rapid variables, as Cyg X-1
Periodic rapid variables, as Cen X-3
Aperiodic variables, as Sco X-1