Constraints on the Chemical Evolution of the M31 Spheroid

Details Constraints on the Chemical Evolution of the M31 Spheroid Constraints on the Chemical Evolution of the M31 Spheroid

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917705f&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #177.05; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We construct a set of simple parametrized models of the chemical evolution of a stellar population. The models include the following generic features: (1) monotonically increasing mean metallicity with time, (2) a star-formation history with one peak, (3) instantaneous recycling, and (4) homogenous mixing of the chemical elements. These features encapsulate nearly all classical chemical evolution models for the stellar populations of galaxies. Within this general framework we test a wide variety of models against deep HST color-magnitude diagrams of the M31 spheroid, disk and tidal stream. We find that such constrained models provide significantly worse fits to the data than models where some of these assumptions are broken.

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