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Paper: Post-AGB Stars in the Magellanic Clouds as Tracers of the s-Process Nucleosynthesis
Volume: 497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time
Page: 241
Authors: De Smedt, K.; Van Winckel, H.; Kamath, D.; Karakas, A. I.; Siess, L.; Goriely, S.; Wood, P. R.
Abstract: Post-AGB stars are ideal probes of the internal processes which occur during the AGB phase. The Galactic post-AGB star sample displays strong chemical diversity, but the poorly known distances and hence luminosities and initial masses hamper the interpretation in the broader context of (chemical) stellar evolution. To overcome these limitations, we perform chemical studies of post-AGB stars in the Magellanic Clouds. We discuss our results obtained so far and report on the most interesting discrepancies between observations and model predictions with a main focus on the challenges regarding C, O and the s-process elements including lead (Pb). We discuss the implications of our findings on our understanding of the AGB nucleosynthesis and mixing processes. Our results show that, similar to Galactic post-AGB stars, there exists considerable chemical diversity among Magellanic Cloud post-AGB stars.
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