Proceedings of the International Astronomical Union

Contributed Papers

Isotopic abundances of Carbon and Oxygen in Oxygen-rich giant stars

Takashi Tsujia1

a1 Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo, 181-0015 Japan email:


16O/17O and 12C/13C ratios in 23 M giants are determined from high resolution IR spectra. The results are confronted with the current models on the convective mixing.


  • Convection;
  • stars: abundances;
  • stars: AGB and post-AGB