Abstract
Observations of recurrent novae (Warner 1976) imply the presence of a red giant (RG) in most, if not all, cases. Giant secondaries in nova systems are otherwise known or suspected only in the peculiar slow novae RR Tel and RT Ser. Bath and Shaviv (1978) showed quantitatively that only a red giant can transfer enough hydrogen-rich mass (~10-5M⊙) to a white dwarf (WD) companion rapidly enough (in ∽30 years) to yield a recurrent nova.
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