A binary star is a system of two gravitationally bound stars that orbit a common center of mass called a barycenter. Stars in a binary system do not necessarily have the same mass, size or brightness.

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Astronomers have identified a rare type of binary star system containing a rapidly spinning millisecond pulsar and a helium star companion, formed via common envelope evolution. Although such systems ...

In theory, it could happen – one of the very first solutions to the three-body problem was this scenario. But it is very unlikely to be stable over time. You need the stars to have near equal mass and ...