RSAA Colloquia / Seminars / Feast-of-Facts: Friday, 27 March 2015, 14:20-14:40; Duffield Lecture Theatre

Luke Shingles

"Helium-rich stellar and chemical evolution"

There is now strong evidence for stars that have been born with initial helium mass fractions as high as Y=0.40, such as in the globular cluster Omega Centauri. However, the evolution, chemical yields, and final fates of helium-rich stars are poorly understood. In this talk, I will present results for the evolution and nucleosynthesis of asymptotic giant branch models with masses of 3 to 6 Msun at a metallicity of [Fe/H] ~= -1.4 with He-normal and He-rich compositions. I will also discuss the implications for chemical evolution and white dwarf remnant formation.