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Context: Ogata et al. (2009; hereafter OKK) presented a theoreticaldetermination of the triple-alpha nuclear reaction rate. Their rate differsfrom the NACRE rate by many orders of magnitude at temperatures relevant forlow mass stars. Aims: We explore the evolutionary implications of adopting theOKK triple-alpha reaction rate in low mass stars and compare the results withthose obtained using the NACRE rate. Methods: The triple-alpha reaction ratesare compared by following the evolution of stellar models at 1 and 1.5 Msolwith Z=0.0002 and Z=0.02. Results: Results show that the OKK rate has severeconsequences for the late stages of stellar evolution in low mass stars. Mostnotable is the shortening--or disappearance--of the red giant phase.Conclusions: The OKK triple-alpha reaction rate is incompatible withobservations of extended red giant branches and He burning stars in old stellarsystems.

Evolutionary implications of the new triple-alpha nuclear reaction rate for low mass stars