Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..774d&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Mar. 15, 1977, p. 774-790.
Astronomy and Astrophysics
Astrophysics
28
Heavy Elements, Light Elements, Neutrons, Nuclear Fusion, Particle Production, Red Giant Stars, Stellar Envelopes, Abundance, Astrophysics, Convective Flow, Hydrogen, Neutron Sources
Scientific paper
Light-element reactions occurring at temperatures of 150 to 250 million K in deeply mixed red-giant convective envelopes are examined, and the production and capture of neutrons by light elements as well as heavy s-process elements are followed. The reaction network used is outlined, s-process reactions are analyzed, and results are presented for the first million seconds of convective mixing. It is shown that: (1) a deeply mixed envelope with a base temperature higher than 150 million K liberates energy equal to the binding energy of the envelope, which may lead to ejection of some portion of the envelope; (2) the major contributions to the energy generation come from O-18(p, alpha)N-15 and C-12(p, gamma)N-13 reactions and cause the formation of a steep gradient in the envelope hydrogen abundance at temperatures below 150 million K; (3) considerable nucleosynthesis occurs at the base of the envelope; and (4) the deeply mixed envelope is the site of a strong source of neutrons for base temperatures of at least 200 million K.
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