x-ray binary star

Science Dictionary
x-ray binary star  
A binary star system that produces a significant amount of x-ray radiation. When one of the components of a binary system is an extremely dense body such as a white dwarf or a neutron star, its enormous gravitational attraction can pull material from the other star into its own orbit, causing the accelerated matter to release high-energy photons in the x-ray spectrum. See more at accretion disk.
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