Evolution of the Outer Galactic Disk via Chemical Abundance Patterns

Details Evolution of the Outer Galactic Disk via Chemical Abundance Patterns Evolution of the Outer Galactic Disk via Chemical Abundance Patterns

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..ses.hb001c&link_type=abstract

American Physical Society, 76th Annual Meeting of the Southeastern Section of APS, November 11-13, 2009, abstract #HB.001

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I review briefly simple models to explain chemical abundance gradients in the disk of our Milky Way Galaxy, and then discuss the observations of both iron, [Fe/H], where the bracket notation refers a logarithmic scale and 0.0 represents the abundances in our Sun, and other so-called ``α'' elements that to be produced primarily in Type II supernovae. I compare the results with the simple models, demonstrating unexpected behavior in the outer Galactic disk, and different behaviors in the old star clusters compared to the much younger Cepheid variables. I conclude that the evidence appears to support a steady growth of the Galactic disk over cosmic time.

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