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- W1638870265 abstract "Observations of planetary nebulae by Sterling, Dinerstein and Bowers have revealed enhancements in the element Germanium (Ge) by factors of 3 to 10 compared to solar. Germanium can be produced by slow-neutron capture (s-process) in asymptotic giant branch (AGB) stars. We compute the detailed nucleosynthesis of a series of AGB models of various masses (1.9 to 6.5M⊙) and metallicities from the zero-aged main sequence to near the end of the thermally-pulsing AGB phase. We include a partial mixing zone of constant mass at the deepest extent of each dredgeup episode. During the interpulse period this mixing zone will produce a 13C pocket in the top ∼ 1/10th of the He-rich intershell, releasing free neutrons that can be captured by iron-seed nuclei. Using a post-processing code that includes 156 species, 1260 reaction rates and time-dependent convective mixing, we follow the nucleosynthesis of all stable isotopes up to 75As, including the five stable Ge isotopes. The surface Ge abundance at the end of the evolution was not enhanced in models with no partial mixing i.e. [Ge/Fe] ≈ 0, except the 6.5M⊙ models which had [Ge/Fe] ≈ 0.2. Models with partial mixing produced surface enhancements of at most a factor of 3.6, i.e. [Ge/Fe] . 0.5 except the 2.5M⊙, Z = 0.004 model with [Ge/Fe] = 0.77. Given the difficulties in matching the compositions of the most Ge-enriched PNe we suggest a late thermal pulse mixed pure He-intershell material, enriched in Ge, with the small amount of remaining convective envelope." @default.
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- W1638870265 date "2006-12-01" @default.
- W1638870265 modified "2023-09-27" @default.
- W1638870265 title "The Production of Germanium in Asymptotic Giant Branch stars" @default.
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