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Lead: Asymptotic Giant Branch production and Galactic Chemical Evolution | | Claudia Travaglio
; Roberto Gallino
; Maurizio Busso
; Raffaele Gratton
; | | Date: |
2 Nov 2000 | | Subject: | astro-ph | | Affiliation: | MPIA, Heidelberg), Roberto Gallino (Universita’ di Torino), Maurizio Busso (Osservatorio Astronomico di Torino), Raffaele Gratton (Osservatorio Astronomico di Padova | | Abstract: | The enrichment of Pb in the Galaxy is followed in the framework of a detailed model of Galactic chemical evolution that already proved adequate to reproduce the chemical enrichment of O and of the elements from Ba to Eu. The stellar yields are computed through nucleosynthesis calculations in the Asymptotic Giant Branch (AGB) phase of low- and intermediate-mass stars, covering a wide range of metallicities. The physical parameters of the stellar structure were derived from full stellar evolutionary models previously computed. We show that low-mass AGB stars are the main producers of Pb in the Galaxy, with a complex dependence on metallicity and a maximum efficiency at [Fe/H] ~ -1. Our calculations succeed in reproducing the abundances of Pb isotopes in the solar system: the role attributed by the classical analysis of the s-process to the ’strong component’, in order to explain more than 50% of solar 208Pb, is actually played by the high production of Pb in low-mass and low-metallicity AGB stars. We then follow the Galactic chemical evolution of Pb isotopes and give our expectations on the s-process contribution to each of them at the epoch of the solar system formation. Finally, we present new spectroscopic estimates of Pb abundance on a sample of field stars and compare them, together with a few other determinations available, with the predicted trend of [Pb/Fe] in the Galaxy. | | Source: | arXiv, astro-ph/0011050 | | Services: | Forum | Review | PDF | Favorites | |
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