Axion emission rates in stars and constraints on its mass

Abstract
We have calculated in detail the emission rates of the invisible axion of Dine, Fischler, and Srednicki in several representative types of stars and derived upper bounds for its mass. We give, in particular, complete reaction amplitudes and energy rates for axion emission. Our results for the axion mass limits are in qualitative agreement with previous estimates for most of the cases except for the neutron stars which give a stronger bound on the axion mass.

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