Definitions for X-ray binary

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Wiktionary

  1. X-ray binary(Noun)

    A binary star system in which one star of the pair is an optically invisible X-ray source.

Freebase

  1. X-ray binary

    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 to the other component, called the accretor, which is compact: a white dwarf, neutron star, or black hole. The infalling matter releases gravitational potential energy, up to several tenths of its rest mass, as X-rays. An estimated 1041 positrons escape per second from a typical hard low-mass X-ray binary.

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