Abstract
The results of calculations of helium shell flashes in stars on the asympototic giant branch (AGB) are discussed. These results when compared with observations of cool giants with peculiar abundances in the Magellanic Clouds unambiguously show that there is an evolutionary sequence up the AGB in the sense M→S→C (N and late R) which is caused by dredge-up of carbon and s-process elements at helium shell flashes. The quantitative agreement between the theory of shell flashes and observations is still not good. The Ba and CH stars, which may all have white dwarf companions, are probably the result of mass transfer from N stars in binary systems. The results of calculations of helium core flashes in stars at the tip of the first giant branch are also discussed. The early R stars may result from mixing at the helium core flash.
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© 1985 D. Reidel Publishing Company, Dordrecht, Holland
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Wood, P.R. (1985). Stellar Evolution, Nucleosynthesis and Dredge-up in Cool Giants. In: Jaschek, M., Keenan, P.C. (eds) Cool Stars with Excesses of Heavy Elements. Astrophysics and Space Science Library, vol 114. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5325-3_47
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DOI: https://doi.org/10.1007/978-94-009-5325-3_47
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