Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..247m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 2, Feb. 1987, p. 247-262.
Astronomy and Astrophysics
Astrophysics
144
Abundance, Hertzsprung-Russell Diagram, Stellar Evolution, Stellar Models, Surface Reactions, Astronomical Maps, O Stars, Stellar Mass Ejection, Supergiant Stars, Wolf-Rayet Stars
Scientific paper
The time evolution of surface abundances in stars of initial mass 15, 20, 25, 40, and 60 solar mass is investigated by means of numerical simulations, using mass-loss/convective-dredge-up models analogous to those constructed by Maeder (1983) for stars with initial mass 60-120 solar mass. Particular attention is given to the distribution of peculiar CNO abundances in the upper part of the HR diagram. The results are presented in extensive tables and graphs and characterized in detail, with reference to available observational data. Findings reported include He/H lifetime ratio = 0.2, CN abundance equilibrium only above 80 solar masses, no ON equilibrium, normal abundances in blue supergiants (except Hubble-Sandage variables and postred supergiants), and greater than normal CN and ON processing in Alpha Sco and Alpha Ori.
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