Production of C-14 and neutrons in red giants

Details Production of C-14 and neutrons in red giants Production of C-14 and neutrons in red giants

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..149c&link_type=abstract

Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 149-158.

Astronomy and Astrophysics

Astrophysics

13

Carbon Stars, Carbon 14, Neutrons, Red Giant Stars, Stellar Evolution, Astrophysics, Late Stars, Nuclear Reactions

Scientific paper

We have examined the effects of mixing various amounts of hydrogen-rich material into the intershell convective region of red giants undergoing helium shell flashes. We find that significant amounts of C-14 can be produced via the N-14(n, p)C-14 reaction. If substantial portions of this intershell region are mixed out into the envelopes of red giants, then C-14 may be detectable in evolved stars. We find a neutron flux many orders of magnitude above the flux required for the classical s-process, and thus an intermediate neutron process (i-process) may operate in evolved red giants. In all cases studied we find substantial enhancements of O-17. These mixing models offer a plausible explanation of the observations of enhanced O-17 in the carbon star IRC 10216. For certain physical conditions we find significant enhancements of N-15 in the intershell region.

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