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

Published online by Cambridge University Press:  30 December 2019

V. Pérez-Mesa ,
O. Zamora ,
D. A. García-Hernández ,
Y. Ossorio ,
T. Masseron ,
B. Plez ,
A. Manchado ,
A. I. Karakas  and
M. Lugaro Open the ORCID record for M. Lugaro [Opens in a new window]
V. Pérez-Mesa
Affiliation:
Instituto de Astrofísica de Canarias (IAC), E-38206 La Laguna, Tenerife, Spain email: vperezme@iac.es Universidad de La Laguna (ULL), Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
O. Zamora
Affiliation:
Instituto de Astrofísica de Canarias (IAC), E-38206 La Laguna, Tenerife, Spain email: vperezme@iac.es Universidad de La Laguna (ULL), Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
D. A. García-Hernández
Affiliation:
Instituto de Astrofísica de Canarias (IAC), E-38206 La Laguna, Tenerife, Spain email: vperezme@iac.es Universidad de La Laguna (ULL), Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
Y. Ossorio
Affiliation:
Instituto de Astrofísica de Canarias (IAC), E-38206 La Laguna, Tenerife, Spain email: vperezme@iac.es Universidad de La Laguna (ULL), Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
T. Masseron
Affiliation:
Instituto de Astrofísica de Canarias (IAC), E-38206 La Laguna, Tenerife, Spain email: vperezme@iac.es Universidad de La Laguna (ULL), Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain
B. Plez
Affiliation:
Laboratoire Univers et Particules de Montpellier, Université de Montpellier2, CNRS, 34095 Montpellier, France
A. Manchado
Affiliation:
Instituto de Astrofísica de Canarias (IAC), E-38206 La Laguna, Tenerife, Spain email: vperezme@iac.es Universidad de La Laguna (ULL), Departamento de Astrofísica, E-38206 La Laguna, Tenerife, Spain Consejo Superior de Investigaciones Científicas (CSIC), E-28006 Madrid, Spain
A. I. Karakas
Affiliation:
Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, VIC3800, Australia
M. Lugaro
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 1121 Budapest, Hungary
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Abstract

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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.

Keywords

starsAGBabundancesevolutionreactionsnucleosynthesisatmosphereslate-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 489 - 490
Copyright
© International Astronomical Union 2019 

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