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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)
http://en.wikipedia.org/wiki/Symbiotic_binary

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