Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..669l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 669-688.
Astronomy and Astrophysics
Astrophysics
89
Hertzsprung-Russell Diagram, Magellanic Clouds, Nuclear Reactions, Stellar Evolution, Stellar Models, Supernova 1987A, Helium, Metallicity, Stellar Cores, Stellar Mass
Scientific paper
Two grids of models are developed with masses and metallicities that approximate those of the LMC and with a semiconvection model that corresponds to the evolution of SN 1987A. The semiconvection model is known to yield constraints analogous to those of SN 1987A and is incorporated into the model to study the mass ranges of blue SN progenitor stars. The evolutionary tracks from the models are examined in the light of observational data. Calculations of 15- and 20-solar-mass sequences show that - regardless of the combination of semiconvective and overshooting efficiency - no blue-supergiant phase is predicted. It is concluded that all models including the present ones erroneously predict a post-main-sequence gap. The model does predict a Teff of approximately less than 20,000 K and other key features of the LMC accurately.
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