Galactic evolution of 7LI: observational clues for models |
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| Authors: | C Travaglio S Randich D Galli C Abia J Lattanzio |
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| Institution: | (1) Max-Planck-Institut für Astrophysik, Munich, Germany;(2) Osservatorio Astrofisico di Arcetri, Firenze, Italy;(3) Universidad de Granada, Granada, Spain;(4) Monash University, Clayton, Victoria, Australia |
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| Abstract: | Different stellar sources may have contributed to the 7Li enrichmentof the Galaxy: type-II supernovae, novae, and AGB stars. In the latter case, the interplay between the Hot Bottom
Burning (HBB) process (via the Cameron-Fowler mechanism) and a very high mass-loss rate before the evolution off the AGB (the
so-called ‘superwind’ phase), can lead to a significant production of 7Li from low- and intermediate-mass AGB stars (Travaglio et al., 2001). We have now undertaken an observational campaign aimed
at constraining our stellar and Galactic models, with a twofold goal: (i) to assemble a compilation of high-resolution spectra of Galactic, unevolved (i.e. dwarfs), warm(spectral type F) stars,
in a selected metallicity range (-1.0 ≤>Fe/H] ≤ -0.3), using the ESO 1.5m telescope and the FEROS spectrograph; (ii) to carry out a Li survey among a sample of selected AGB stars, to investigate the possible correlation between7Li abundance (when detected) and mass-loss rate.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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| Keywords: | Galaxy: abundances evolution stars: nucleosynthesis AGB Mira |
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