Other
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1066s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Oct. 1986, p. 1066-1071.
Other
9
Abundance, Asymptotic Giant Branch Stars, Nuclear Fusion, Stellar Composition, Stellar Evolution, Convection, Giant Stars, Helium, Nitrogen, Planetary Nebulae, Stellar Mass
Scientific paper
Models of AGB evolution of intermediate mass stars are constructed that take into account overshooting by extrapolating models by Bertelli et al. (1985). Models with overshooting show an increased importance of second dredge-up compared with standard models. He production is increased, allowing dY/dZ to increase by roughly 0.7. Secondary N production is also increased in a way that can explain the observed N/O versus O diagram. Overshooting decreases the theoretical minimum mass for the formation of type I planetary nebulae (PN) down to roughly 2.6 solar masses, in good agreement with the observed value of 2.4 solar masses. Other effects of overshooting in type I PN are He/H abundances as high as 0.22 and higher depletion of O.
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