Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9133039b&link_type=abstract
Unknown
Astronomy and Astrophysics
Astrophysics
Astrophysics, Giant Stars, Nuclear Capture, Stellar Evolution, Synthesis (Chemistry), Thermonuclear Reactions, Carbon 13, Neon Isotopes, Neutrons
Scientific paper
The production of half of the isotopes from iron to lead has been attributed to a process involving the neutron captures on iron peak nuclei. The timescales on which the captures occur is of the order of beta-decay timescales of nuclei not far from beta-stability. This is known as the s-process. In recent years, the thermal pulsation stage of asymptotic giant branch (AGB) stars has been thought to be the astrophysical site in which this neutron production and capture could happen. Recent models of such stars have provided evidence for different neutron sources than what previously had been believed. In addition, past studies of the old models had seemingly neglected the presence of various physical phenomena such as convective mixing and time dependent parameters, such as the retreat of the convective shell, that could eventually effect the final isotope distribution. We have made a realistic look at the entire mass range of thermally pulsing AGB stars as the sole site of s-process isotopes.
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