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Lithium and s-process enrichment in massive galactic AGB stars

Published online by Cambridge University Press:  25 May 2016

P. García-Lario ,
F. D'Antona ,
J. Lub ,
B. Plez  and
H.J. Habing
P. García-Lario
Affiliation:
ISO Data Centre, Apartado de Correos 50727, Villafranca del Castillo, E-28080 Madrid, Spain
F. D'Antona
Affiliation:
Osservatorio Astronomico di Roma, I-00040 Monteporzio, Italy
J. Lub
Affiliation:
Sterrewacht Leiden, Postbus 9513, NL-2300 RA Leiden, The Netherlands
B. Plez
Affiliation:
Astronomiska Observatoriet, Box 515, S-75120 Uppsala, Sweden Atomspektroskopi, Fysiska Institution, Box 118, S-22100 Lund, Sweden
H.J. Habing
Affiliation:
Sterrewacht Leiden, Postbus 9513, NL-2300 RA Leiden, The Netherlands

Abstract

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We present the first results of a wide observational program intended to study the effects of hot-bottom burning and of the third dredge-up in the chemical evolution of the most luminous AGB stars in our Galaxy. The main goal is to provide new observational constraints to the models through the analysis of lithium and s-process element abundances in a carefully selected sample of galactic AGB stars. Our results indicate that, unlike observed in the Magellanic Clouds, the most massive AGB candidates in our Galaxy do not show any significant enrichment in s-process elements. In addition, only some of them are found to be Li-rich.

Type
Part 1. Basic Facts, Structure, Evolution, Nucleosynthesis
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 91 - 96
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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