Other
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..410m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 1, 1986, p. 410-414. Research supported by the University of Cal
Other
28
Asymptotic Giant Branch Stars, Giant Stars, Metallicity, Nuclear Fusion, Stellar Composition, Stellar Evolution, Abundance, Niobium, Technetium, Temperature Dependence, Time Dependence
Scientific paper
Recent measurements of quantitative stellar abundances for Tc, Nb, and elements with neighboring atomic numbers are discussed in the framework of detailed network calculations of the production and destruction of Tc during thermal pulses operating in AGB stars. It is found that Tc may not be a good indicator of the s-process temperature since the thermally enhanced beta-decay rate for Tc-99 appears to be compensated by the increased neutron production in a Ne-22(alpha, n)Mg-25 s-process. The time dependence of the surface abundances of Tc and Nb and other elements during the third dredge-up phase of AGB stars is investigated. In the framework of a simple analytical two-reservoir model, it is argued that the observed abundances may be a good indicator of the lifetime of stars in this phase of evolution.
Howard Michael W.
Mathews Grant J.
Takahashi Keitaro
Ward Richard A.
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