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X-ray binary

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

X-ray binary An X-ray emitting binary system consisting of a neutron star (or in a few cases a black hole) and a normal stellar companion. They are divided into two groups according to the mass of the companion. In a low-mass X-ray binary (LMXB), for example Scorpius X-1, the normal star is less than about 2 solar masses; it is greater than about 10 solar masses in a high-mass X-ray binary (HMXB), such as Cygnus X-1. Binaries with intermediate-mass companions are very rare. The X-ray emission is a result of accretion of material from the companion on to the neutron star.

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