When material expanding away from a star in a binary system reaches the Roche surface

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When material expands away from a star in a binary system, it can reach a point where it is no longer gravitationally bound to the star, which is called the Roche surface. At this point, the material can be pulled toward the companion star by its gravitational force, causing it to accrete onto the companion. However, it is not guaranteed that all of the material will accrete onto the companion, as some of it may be expelled by other forces or be redirected by other gravitational effects. Additionally, the material reaching the Roche surface does not necessarily undergo thermonuclear fusion, as this requires specific conditions for a sustained chain reaction to occur.

When Material Expanding Away from a Star in a Binary