X-ray binaries are a class of binary stars that are luminous in X-rays. The X-rays are produced by matter falling from one component, called the donor (usually a relatively common main sequence star), to the other component, called the accretor, which can be a white dwarf, neutron star or black hole.
X-ray binaries are a class of binary stars that are luminous in X-rays. The X-rays are produced by matter falling from one component, called the donor (usually a relatively common main sequence star), to the other component, called the accretor, which can be a white dwarf, neutron star or black hole.
Source: Wikipedia "X-ray binary" · CC BY-SA 4.0
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