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Tungsten isotopic compositions in stardust SiC grains from the Murchison meteorite: Constraints on the s-process in the Hf-Ta-W-Re-Os region
J. N. Ávila, M. Lugaro, T. R. Ireland +7
We report the first tungsten isotopic measurements in stardust silicon carbide (SiC) grains recovered from the Murchison carbonaceous chondrite. The isotopes 182W, 183W, 184W, 186W…
Evolution, nucleosynthesis and yields of low mass AGB stars at different metallicities (II): the FRUITY database
Sergio Cristallo, Luciano Piersanti, Oscar Straniero +6
By using updated stellar low mass stars models, we can systematically investigate the nucleosynthesis processes occurring in AGB stars, when these objects experience recurrent ther…
The s-Process in Low Metallicity Stars. II. Interpretation of High-Resolution Spectroscopic Observations with AGB models
S. Bisterzo, R. Gallino, O. Straniero +2
High-resolution spectroscopic observations of a hundred metal-poor Carbon and s-rich stars (CEMP-s) collected from the literature are compared with the theoretical nucleosynthesis…
Deep Mixing in Evolved Stars. II. Interpreting Li Abundances in RGB and AGB Stars
S. Palmerini, S. Cristallo, M. Busso +4
We reanalyze the problem of Li abundances in red giants of nearly solar metallicity. After an outline of the problems affecting our knowledge of the Li content in low-mass stars (M…
The First Fluorine Abundance Determinations in Extragalactic AGB Carbon Stars
C. Abia, K. Cunha, S. Cristallo +5
Fluorine (19F) abundances (or upper limits) are derived in six extragalactic AGB carbon stars from the HF(1-0) R9 line at 2.3358 mu in high resolution spectra. The stars belong to…
Nucleosynthesis origin of PG 1159 stars, Sakurai's object and of rare subclasses of presolar grains
R. Gallino, O. Straniero, E. Zinner +4
We discuss theoretical AGB predictions for hydrogen-deficient PG 1159 stars and Sakurai's object, which show peculiar enhancements in He, C and O, and how these enhancements may be…