Evolution of the surface abundance of a 3 Msolar AGB star

Details Evolution of the surface abundance of a 3 Msolar AGB star Evolution of the surface abundance of a 3 Msolar AGB star

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998cha%26a..22...49z&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 22, Issue 1, p. 49-55.

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

We calculated the evolution of surface heavy elements and CO ratio for a 3 Msolar thermal-pulse, AGB star with initial metallicity 0.015, based on the theories of the s-process and star evolution. For reasonable parameter values, our calculated curve falls within the observed regions of the MS, S and C stars in the abundance and C/O diagrams. The range of the neutron irradiance is τ0 = 0.2-0.6 mb-1. Under the reasonable assumption that dredge-up occurs after the asymptotic distribution is established, factors such as whether or not the core mass or the mass dredged-up varies with the pulse number have little effect on the surface abundance of intrinsic AGB stars. The dredge-up-starting pulse number affects the abundance of MS and S stars more than that of the C stars.

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