Symbiotic star

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A symbiotic star is a star system, most usually an interacting binary indicated by exhibition of spectral lines of highly contrasting temperatures such as those typical of a late-sequence red giant or supergiant (~3000°K) and a dwarf companion star (~20 000°K), whose mass characteristics and proximity trigger nova-like outbursts. The transfer of mass between the pair occurs either by gravitational streaming or as stellar wind from the red giant.