Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313l..11w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. L11-L14. NASA-NSF-supported r
Astronomy and Astrophysics
Astrophysics
28
Chemical Evolution, Solar Neighborhood, Star Formation, Stellar Evolution, Stellar Models, Abundance, Metallicity, Star Formation Rate, Stellar Composition, Stellar Spectra
Scientific paper
The chemical evolution resulting from a simple model of bimodal star formulation is investigated, using constraints from the solar neighborhood to set the parameters of the initial mass function and star formation rate. The two modes are an exclusively massive star mode, which forms stars at an exponentially declining rate, and a mode which contains stars of all masses and has a constant star formation rate. Satisfactory agreement with the age-metallicity relation for the thin disk and with the metallicity structure of the thin-disk and spheroid stars is possible only for a small range of parameter values. The preferred model offers a resolution to several of the long-standing problems of galactic chemical evolution, including explanations of the age-metallicity relation, the gas consumption time scale, and the stellar cumulative metallicity distributions.
Silk Joseph
~Wyse Rosemary F. G.
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