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Understanding the Li Production in AGB stars: the J-type Stars
Published online by Cambridge University Press: 25 May 2016
Abstract
A full abundance analysis have been carried out in 12 galactic J-stars. The analysis shows: a) 12C/13C ratios are low, b) the abundance of s-process and rare-earth elements with respect to the stellar metallicity is nearly-solar, [< heavy > /Fe] = 0.10 ± 0.11 c) Tc is not present in most of the stars although upper limits are placed in WZ Cas and WX Cyg, probably two SC-type stars, and d) all the stars are Li-rich, log ∈(Li)> 1. The location of J-stars in an empirical H-R diagram when compared with that of the normal N-type carbon stars, suggests that J-stars may be in the early-AGB phase. The different mechanism proposed to be responsible of this Li production are briefly discussed.
- Type
- 4. Lithium Abundances
- Information
- Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 370 - 372
- Copyright
- Copyright © Astronomical Society of the Pacific 2000