(Beta Per, β Per, Beta Persei, β Persei)
(multiple star system demonstrating affects of mass transfer)
(Beta Persei, β Persei, Beta Per, or β Per)
is a triple star system including an
eclipsing binary, and whose stars do not
appear to match normal main-sequence
evolution, a consequence of mass transfer between stars.
Characteristics (β Per Aa1):
The "wrong" characteristics of the stars due to
the accretion between stars is known as the Algol paradox.
It is also the prototype for a class of variable stars
called Algol variables, or just Algols.
(star,binary star,variable star)
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post-common envelope binary (PCEB)