Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-30
New Astron.Rev. 46 (2002) 463-468
Astronomy and Astrophysics
Astrophysics
6 pages, including 4 PostScript figures, to appear in Proc. "Astronomy with Radioactivities III", New Astronomy Reviews
Scientific paper
We present a nucleosynthesis calculation of a 25 solar mass star of solar composition that includes all relevant isotopes up to polonium. In particular, all stable isotopes and necessary nuclear reaction rates are covered. We follow the stellar evolution from hydrogen burning till iron core collapse and simulate the explosion using a ``piston'' approach. We discuss the influence of two key nuclear reaction rates, C12(a,g) and Ne22(a,n), on stellar evolution and nucleosynthesis. The former significantly influences the resulting core sizes (iron, silicon, oxygen) and the overall presupernova structure of the star. It thus has significant consequences for the supernova explosion itself and the compact remnant formed. The later rate considerably affects the s-process in massive stars and we demonstrate the changes that different currently suggested values for this rate cause.
Boyes M. M.
Heger Alexander
Hoffman Robert D.
Rauscher Thomas
Woosley Stan E.
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