New theoretical yields of intermediate mass stars

Details New theoretical yields of intermediate mass stars New theoretical yields of intermediate mass stars

1996-10-04

arxiv.org/abs/astro-ph/9610030v1

Astronomy and Astrophysics

Astrophysics

25 pages, 4 PS files, 38 tables, accepted by Astronomy and Astrophysics (Supplement Series), Sept. 1996, tables 2-38 are avail

Scientific paper

We present theoretical yields of H, $^{4}$He, $^{12}$C, $^{13}$C, $^{14}$N, and $^{16}$O for stars with initial masses between 0.8 and 8 M$_{\odot}$ and initial metallicities Z = 0.001, 0.004, 0.008, 0.02, and 0.04. We use the evolutionary tracks of the Geneva group up to the early asymptotic giant branch (AGB) in combination with a synthetic thermal-pulsing AGB evolution model to follow in detail the chemical evolution and mass loss up to the end of the AGB including the first, second, and third dredge-up phases. Most of the relations used are metallicity dependent to make a realistic comparison with stars of different initial abundances. The effect of Hot Bottom Burning (HBB) is included in an approximate way. The free parameters in our calculations are the mass loss scaling parameter $\eta_{AGB}$ for stars on the AGB (using a Reimers law), the minimum core mass for dredge-up M$_{c}^{min}$, and the third dredge-up efficiency $\lambda$. As derived from previous extensive modeling, $\eta_{AGB}$ = 4, M$_{c}^{min}$ = 0.58 \mss, and $\lambda = 0.75$ including HBB are in best agreement with observations of AGB stars both in the Galactic disk and the Magellanic Clouds. We compare the abundances predicted during the final stages of the AGB with those observed in planetary nebulae in the Galactic disk and show that the model with the aforementioned parameters is in good agreement with the observations. The metallicity dependent yields of intermediate mass stars presented in this paper are well suited for use in galactic chemical evolution models.

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