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- Title
On the circumstellar effects on the Li and Ca abundances in massive Galactic O-rich AGB stars.
- Authors
Pérez-Mesa, V.; Zamora, O.; García-Hernández, D. A.; Ossorio, Y.; Masseron, T.; Plez, B.; Manchado, A.; Karakas, A. I.; Lugaro, M.
- Abstract
We explore the circumstellar effects on the Li and Ca abundances determination in a complete sample of massive Galactic AGB stars. The Li abundance is an indicator of the hot bottom burning (HBB) activation, while the total Ca abundance could be affected by overproduction of the short-lived radionuclide 41Ca by the s -process. Li abundances were previously studied with hydrostatic models, while Ca abundances are determined here for the first time. The pseudo-dynamical abundances of Li and Ca are very similar to the hydrostatic ones, indicating that circumstellar effects are almost negligible. The new Li abundances confirm the (super-)Li-rich character of the sample Li-detected stars, supporting the HBB activation in massive Galactic AGB stars. Most sample stars display nearly solar Ca abundances that are consistent with predictions from the s-process nucleosynthesis models. A minority of the sample stars show a significant Ca depletion. Possible reasons for their (unexpected) low Ca content are given.
- Publication
Proceedings of the International Astronomical Union, 2018, Vol 14, Issue S343, p489
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S174392131800501X