On the circumstellar effects on the Li and Ca abundances in massive Galactic O-rich AGB stars

V. Pérez-Mesa, O. Zamora, D. A. Garciá-Hernández, Y. Ossorio, T. Masseron, B. Plez, A. Manchado, A. I. Karakas, M. Lugaro

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

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.

Original languageEnglish
Title of host publicationProceedings of the International Astronomical Union
EditorsFranz Kerschbaum, Martin Groenewegen, Hans Olofsson
Place of PublicationUnited Kingdom
PublisherCambridge University Press
Pages489-490
Number of pages2
Volume14
EditionS343
ISBN (Print)9781108471527
DOIs
Publication statusAccepted/In press - 1 Jan 2019
EventInternational Astronomical Union: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time - Vienna, Austria
Duration: 20 Aug 201823 Aug 2018
Conference number: 343
https://www.univie.ac.at/galagb/s343/

Publication series

NameProceedings of the International Astronomical Union
PublisherCambridge University Press
ISSN (Print)1743-9213

Conference

ConferenceInternational Astronomical Union
CountryAustria
CityVienna
Period20/08/1823/08/18
Internet address

Keywords

  • abundances
  • AGB
  • atmospheres
  • evolution
  • late-type
  • nucleosynthesis
  • reactions
  • stars

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