منابع مشابه
The s-process in rotating AGB stars
We discuss the occurrence of the s-process during the radiative interpulse phase of rotating AGB stars. Due to differential rotation, protons are mixed into C-rich layers after thermal pulses, in the course of the so called third dredge up episode. We follow the time evolution of key isotope abundances in the relevant layers with a post-processing code which includes time dependant mixing and n...
متن کاملMixing and the s-process in rotating AGB stars
We model the nucleosynthesis during a radiative interpulse phase of a rotating 3M⊙ Asymptotic Giant Branch (AGB) star. We find an enhanced production of the neutron source species C compared to non-rotating models due to shear mixing of protons and C at the core-envelope interface. We estimate that the resulting total production of heavy elements by slow neutron capture (s-process) is too low t...
متن کاملNucleosynthesis in Intermediate Mass Agb Stars
We present a summary of the main sites for nucleosynthesis in intermediate mass Asymptotic Giant Branch (AGB) stars. We then discuss some detailed evolutionary models and how these have been used to create a synthetic evolution code which calculates the nucleosynthesis very rapidly, enabling us to investigate changes in some uncertain parameters in AGB evolution, such as mass-loss and dredge-up...
متن کاملs-Process Nucleosynthesis in Low-Metallicity Stars
Nobuyuki IWAMOTO1,∗, Toshitaka KAJINO, Grant J. MATHEWS, Masayuki Y. FUJIMOTO and Wako AOKI National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan The Graduate University for Advanced Studies, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan Center for Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA Department of Physics, Hokkaido Univ...
متن کاملCNO enrichment by rotating AGB stars in globular clusters
Context. AGB stars have long been held responsible for the important star-to-star variations in light elements observed in Galactic globular clusters. Aims. We analyse the main impacts of a first generation of rotating intermediate-mass stars on the chemical properties of secondgeneration globular cluster stars. The rotating models were computed without magnetic fields and without the effects o...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1989
ISSN: 0252-9211
DOI: 10.1017/s0252921100062898