Abstract
Abundance peculiarities in successive stages of stellar evolution are reviewed. Main-sequence stars show anomalies in lithium and, on the upper main sequence, the Am, Ap and Bp effects, which may he largely due to separation processes, and helium and CNO anomalies to which nuclear evolution and mixing could have contributed. Red giants of both stellar Populations commonly show more or less extreme variations among the C, N, O isotopes, sometimes accompanied by s-process enhancement, due to mixing out in various evolutionary stages. Detailed anomalies expected from galactic evolution are also briefly considered. Novae show strong effects in C, N, O and synthesis of heavier elements is displayed by the supernova remnant Cassiopeia A.
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Pagel, B.E.J. (1977). Observational Evidence for Atmospheric Chemical Composition Peculiarities Relevant to Stellar Evolution. In: Müller, E.A. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 4-2. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1250-8_37
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