The New s-Process in Low Mass TP-AGB Stars

Details The New s-Process in Low Mass TP-AGB Stars The New s-Process in Low Mass TP-AGB Stars

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nupha.621..423g&link_type=abstract

Nuclear Physics A, v. 621, p. 423-430.

Physics

Nuclear Physics

4

Scientific paper

The s-process nucleosynthesis occurring in the Asymptotic Giant Branch phases has been computed through a post-process calculation, following the results of stellar evolutionary models obtained with the FRANEC code for low mass stars (1-3 Msolar) with metallicity Z = 0.02. Mass loss with the Reimers (1975)'s parameterization was taken into account (η = 3). Since the development of the third dredge up, we assumed that a 13C-pocket is formed at the H/He discontinuity when the H-shell is inactive. Neutrons are released by the 13C(α,n)16O source in radiative conditions in the interpulse period in a thin layer of a few 10-4 Msolar. The 22Ne(α,n)25Mg reaction operates marginally in convective pulses, over a material that was previously s-processed in the radiative phase and mixed with fresh Fe and H-burning ashes. The conditions under which the solar main s-process component is reproduced are discussed.

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