Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265l..17l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. L17-L20.
Astronomy and Astrophysics
Astrophysics
87
Early Stars, Helium, Stellar Evolution, B Stars, Hertzsprung-Russell Diagram, O Stars, Stellar Mass
Scientific paper
In recent years quantitative spectroscopy of luminous O and B stars revealed three fundamental discrepancies with stellar evolution calculation, namely: the derived masses are much smaller than evolutionary masses, the post-main sequence gap in the HR diagram - predicted by evolutionary calculations - is found to be filled with stars, and observed helium and nitrogen enrichment in luminous OB stars is not predicted. In new evolutionary computations, including turbulent diffusion in the radiative stellar interior and semiconvection, we show that all three problems may be closely related, and provide first quantitative models for a 20-solar-mass star of LMC composition. A number of predictions are derived from this models which may be tested in the future. It is concluded that beneath mass and composition rotation or binarity may be a third equally important initial condition for the evolution of massive stars.
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