Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19s.120c&link_type=abstract
"Progress in Astronomy, Vol. 19, Supp., p. 120 - 123 (2001). In: Proceedings of the Fourth China-Germany Workshop on Cosmology "
Astronomy and Astrophysics
Astronomy
Galactic Disk: Chemical Evolution
Scientific paper
We introduce a two-component model of the Galactic disk to investigate its chemical evolution. It is assumed that the formation of the thick and thin disks occurs in two main accretion episodes with both infall rates being Gaussian. Both the pre-thin and post-thin scenarios for the formation of the thick disk are considered. The best fit is obtained through χ2-test between the models and the observed metallicity distribution function of G dwarfs in the solar neighborhood. Our results show that, the predictions of both the pre-thin and post-thin model agree well with the new observed G-dwarf metallicity distribution. However, the present-day local density of the thick disk, required for the pre-thin model to get the best fit, is larger than most of results from star counts, yet this disagreement does not exist for the post-thin model. From this point of view, it would seem that the post-thin model is more viable. Finally, other comparisons between model predictions and observations are given.
Chang Rui-Xiang
Fu Cheng-Qi
Hou Lu-Jing
Shu Cheng-Gang
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