The G-dwarf problem and the closed-box models of Galactic evolution

Details The G-dwarf problem and the closed-box models of Galactic evolution The G-dwarf problem and the closed-box models of Galactic evolution

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..487f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. 487-491.

Astronomy and Astrophysics

Astrophysics

17

Abundance, Dwarf Stars, G Stars, Galactic Evolution, Metallicity, Star Formation, Deuterium, Giant Stars, Heavy Elements

Scientific paper

The paucity of very iron-poor stars in the Galactic disk with respect to the predictions of the simple model of Galactic chemical evolution (the notorious G-dwarf problem) is one of the most fundamental constraints of Galactic evolutionary models. This paper tests recently proposed models, with bimodal and varying star formation rates, against the G-dwarf metallicity distribution, the gas/total mass ratio in the solar vicinity, the 'age-metallicity' relation, and the abundances of deuterium, O-16, Mg-24, Si-28, and Fe-56 at the birth of the sun. It is shown that none of these models agree entirely with the data, but that it is possible to find a combination of the two models leading to reasonable results.

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