Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1735g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, June 1988, p. 1735-1743.
Astronomy and Astrophysics
Astronomy
2
Chemical Evolution, Dwarf Stars, Galactic Evolution, Main Sequence Stars, Star Formation, Stellar Mass Ejection, F Stars, G Stars, Hertzsprung-Russell Diagram, Metallic Stars
Scientific paper
Simple closed galactic chemical-evolution models incorporating early main-sequence stellar mass loss have been developed for disk ages of 5, 10, and 15 Gyr. Relative to models without stellar mass loss, the models are shown to produce a 30-60 percent increase in the present mass ratio of dwarfs to dwarfs plus remnants, and a 200-250 percent increase in the total mass of late F dwarfs remaining on the main sequence at the current disk age. For present disk ages 5 and 10 Gyr, the total mass of mid-F dwarfs remaining on the main sequence is also shown to increase by 90-120 percent. It is concluded that models with main-sequence mass loss have a slightly reduced gas metallicity and slightly increased gas fraction midway through the evolution.
Guzik Joyce Ann
Struck-Marcell Curtis
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