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Symbiotic Binary

(Symbiotic Star)
(giant star transferring mass to a somewhat distant companion)

The term Symbiotic Binary (or just Symbiotic Star) is used for a Binary Star that is not in contact, i.e., has an orbital period up to a year or more, but shows signs of mass transfer. The accepted model is Accretion by a White Dwarf of Stellar Wind material from a companion Giant Star, e.g., Red Giant. Some alternate between an Active Phase (i.e., when the transfer is occurring) and a Quiescent Phase. Some have Jets.

(binary stars,star type)