Evolution and nucleosynthesis of helium-rich asymptotic giant branch models

Luke J. Shingles, Carolyn L. Doherty, Amanda I. Karakas +3

There is now strong evidence that some stars have been born with He mass fractions as high as $Y\approx 0.40$ (e.g., in $\omega$ Centauri). However, the advanced evolution, chemical yi…