X-ray binary | Wikipedia audio article | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-11-18

This is an audio version of the Wikipedia Article:
X-ray binary | Wikipedia audio article

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- Socrates



SUMMARY
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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 normal star), to the other component, called the accretor, which is very compact: a neutron star or black hole. 
The infalling matter releases gravitational potential energy, up to several tenths of its rest mass, as X-rays.  (Hydrogen fusion releases only about 0.7 percent of rest mass.)  The lifetime and the mass-transfer rate in an X-ray binary depends on the evolutionary status of the donor star, the mass ratio between the stellar components, and their orbital separation.An estimated 1041 positrons escape per second from a typical low-mass X-ray binary.