Stellar evolution as a probe of neutrino properties

Statistics – Computation

Scientific paper

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Globular Clusters, Neutrinos, Red Giant Stars, Stellar Evolution, Stellar Mass, Magnetic Moments, Stellar Cores, Stellar Models

Scientific paper

We present the results of evolutionary computations devoted to a study of the effect of a nonvanishing neutrino magnetic moment (NMM) on the evolution of stars. In agreement with previous investigations, we found that NMM affects the evolution of low-mass stars, increasing the cooling mechanisms in the core of red giants and thus increasing the mass of the He core at the onset of central He burning. The evolution of selected models through the whole phase of He burning has been followed. Contrary to previous suggestions, we found that the direct influence of NMM on these structures appears negligible. Comparison with observational constraints concerning the pulsational properties of RR Lyrae variables in the well-studied globular cluster M3 gives an upper limit to NMM of less than 10 exp -12 micro-B.

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