Effects of envelope overshoot on intermediate mass stars
نویسندگان
چکیده
منابع مشابه
Diffusive convective overshoot in core He - burning intermediate mass stars . I : the LMC metallicity
We present detailed evolutionary calculations focused on the evolution of intermediate mass stars with 3M ⊙ ≤ M ≤ 9M ⊙ of metallicity typical of the Large Magellanic Cloud (LMC), i.e. Z = 0.008. We compare carefully the models calculated by adopting a diffusive scheme for chemical mixing, in which nuclear burning and mixing are self-consistently coupled, while the eddy velocities beyond the for...
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We discuss nucleosynthesis within 6 M models with Z = 0:02, 0:008 and 0:004. The emphasis is on the AGB phase of evolution, with particular reference to thermal pulses and Hot Bottom Burning. We nd strong CN cycling, with substantial Al production, especially at low metallicities.
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The concept of overshoot has already been considered for numerous cases in stellar evolution calculations. We explore the consequences of overshoot at the convection zone which forms during the He-flash (thermal pulse) in AGB stars. We find dramatic changes for the abundances within the intershell region as well as for the mechanism of the 3 dredge-up. That means that both the predicted evoluti...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1991
ISSN: 0074-1809
DOI: 10.1017/s0074180900200697