Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf...15h&link_type=abstract
"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes
Astronomy and Astrophysics
Astrophysics
Scientific paper
Our understanding of the local constraints of the chemical evolution of the Galaxy have significantly changed in the recent years. This includes new results on the link between the two disks and on the two main constraints of galactic chemical evolution - the distribution of metallicities and the age-metallicity relation - and their new interpretation when radial migration of stars is properly taken into account. I discuss most recent advances on these three points. It is argued that the so-called G dwarf problem cannot constrain infall because, starting with an initial metallicity of -0.2 dex, the thin disk could not have formed stars with 1/3 of solar abundance. Given this initial metal content, the problem is not to explain why there are so few metal-poor stars, but more likely to explain why there are so few metal-rich ones, for which infall could bring a correct answer. As a consequence of the conclusive link that relates the thin and thick disks, the picture that emerge is that the thick disk appears to have been the main episode of chemical enrichment in the Galaxy. The Gaia perspective is evoked.
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