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Abstract: We revisit the problem of why stars become red giants. We modify the physicsof a standard stellar evolution code in order to determine what does and whatdoes not contribute to a star becoming a red giant. In particular, we have runtests to try to separate the effects of changes in the mean molecular weightand in the energy generation. The implications for why stars become red giantsare discussed. We find that while a change in the mean molecular weight isnecessary but not sufficient for a 1 solar mass star to become a red giant,this is not the case in a star of 5 solar masses. It therefore seems that theremay be more than one way to make a giant.



Author: Richard J. Stancliffe, Alessandro Chieffi, John C. Lattanzio, Ross P. Church

Source: https://arxiv.org/







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