Grids of evolutionary models from 0.85 to 120 solar masses - Observational tests and the mass limits

Details Grids of evolutionary models from 0.85 to 120 solar masses - Observational tests and the mass limits Grids of evolutionary models from 0.85 to 120 solar masses - Observational tests and the mass limits

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210..155m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 155-173.

Statistics

Computation

442

Computational Astrophysics, Stellar Evolution, Stellar Mass, Stellar Models, Abundance, Hertzsprung-Russell Diagram, Mass To Light Ratios, Stellar Magnitude, Stellar Structure

Scientific paper

Grids of evolutionary models in the 0.85 to 120 solar mass range with composition X = 0.70, Z = 0.02 are computed with mass loss and moderate core overshooting for the main observable phases of stellar evolution. Detailed tests of observable features sensitive to core overshooting are made in order to better determine, by comparison with standard models, the amount of core overshooting. The test results clearly point in favor of moderate overshooting from convective cores. The consequence of moderate overshooting on several stellar mass limits are analyzed and found to be substantial but not drastic. The minimum initial mass for off-center C-ignition proceeding to central exhaustion is lowered from 9 solar masses to about 6.6 solar masses. The lower mass for the second-dredge-up is brought from 4.6 solar masses to 3.3 solar masses. The maximum mass for degenerate He-ignition becomes 1.85 solar mass rather than 2.2 solar masses.

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