What specific type of object is cited as an example of intense gravitational accretion occurring in a binary system?

Answer

X-ray binaries

X-ray binaries, which involve a neutron star or black hole gravitationally stripping material from a companion star, are prime examples of intense, high-energy accretion in action.

What specific type of object is cited as an example of intense gravitational accretion occurring in a binary system?
Geologyprocessplanetmassaccretion