Several examples of flattened accretion disks being "fed" by a large companion star can be seen clearly in photos from the Hubble Space Telescope
A subclass of binary stars that are bright in X-rays are known as X-ray binaries. The accretor, which is either a neutron star or a black hole, is extremely compact, and produces the X-rays by mass falling from the donor, which is often a somewhat normal star, to the accretor. The falling matter emits X-rays made up of gravitational potential energy that can reach several tenths of its rest mass. (Only 0.7 percent of the remainder mass is released during hydrogen fusion.) The donor star's evolutionary stage, the mass disparity between the stellar components, and their orbital spacing all affect the lifetime and mass-transfer rate in an X-ray binary. A number of (sometimes overlapping) subclasses are further separated into X-ray binaries, which may better reflect the underlying physics. Keep in mind that the classification
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