![]() ![]() ![]() This conclusion is mirrored in our stellar population yields, weighted towards the lower mass regime to reflect the mass distribution within a respective galaxy. ![]() Studienblatt): A 091 413 Astronomie Betreuer: Doz. Lederer Matrikel-Nummer: 9725760 Dissertationsgebiet (lt. We find the chemical contributions of our models are dominated by proton capture nucleosynthesis, mixed to the surface during the first and second dredge-up events. Third dredge-up in cluster AGB stars: observational constraints and improved opacity data for models Dissertation zur Erlangung des. There is minor production at the first s-process peak at strontium, which decreases sharply with increasing metallicity. We show that for progenitor metallicities in the range 0.00003 Z 0.001, and in the absence of carbon enrichment from the occurrence of a third dredge-up episode, the resulting H envelope of the low-mass white dwarfs is thick enough to make stable H burning the most important energy source even at low luminosities. This contributes a significant uncertainty to galactic chemical evolution simulations. The dredge-up predictions are,however, expected to depend on the convection prescrip-tioninthe envelope. Yet yields for asymptotic giant branch (AGB) stars with metallicities greater than Z = 0.04 do not exist in the literature. Low- and intermediate-mass stars with supersolar metallicities comprise a known portion of the universe. ![]()
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