Physics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..931a&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, May 1, 1980, p. 931-950. Research supported by the Deutsche Forschungsgemeinschaft and
Physics
44
Abundance, Aluminum 26, Hydrogen, Nuclear Fusion, Stellar Envelopes, Supernovae, Magnesium, Novae, Stellar Structure
Scientific paper
The possibility of Al-26 synthesis during the explosive processing of hydrogen-rich material in the outer layers of a supernova or in nova envelopes is investigated. It is found that in the peak temperature range of 1-3 x 10 to the 8th deg K and for expansion time scales of the order of 1-1000 s, values of (Al-26)/(Al-27) as high as 0.1-1 can be obtained for values of 0.001-100,000 for the product of the peak density in g/cu cm and the proton mass fraction. Such a level of Al-26 production is considerably higher than that of recent carbon/neon burning nucleosynthesis models, and is sufficient to account for the magnesium anomalies detected in certain inclusions from the Leoville and Allende meteorites. Al abundances resulting from a hydrodynamical calculation performed on the grounds of a 25 solar mass presupernova model are also presented, and the influence of uncertainties in the input physics is discussed; in particular, the rates of the (Mg-25)(p,gamma)(Al-26) and (Al-26)(p,gamma)(Si-27) key reactions are studied.
Arnould Marcel
Hillebrandt Wolfgang
Norgaard H.
Thielemann Friederich-Karl
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