It has been discovered that the most evolved intermediate-mass stars in our Galaxy are very rich in rubidium. This finding is the first observational evidence that these stars produce enormous quantities of the radioactive isotope 87Rb, as had been predicted from theoretical models of stellar nucleosynthesis more than 40 years ago. This result provides a new observational perspective on the nucleosynthesis of s-elements in AGB stars and imposes observational constraints on theoretical models, which will surely improve our understanding of the final stages in the evolution of intermediate
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