A New Look at Simple Inhomogeneous Chemical Evolution

Details A New Look at Simple Inhomogeneous Chemical Evolution A New Look at Simple Inhomogeneous Chemical Evolution

2000-08-18

arxiv.org/abs/astro-ph/0008302v2

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ Letters. 4 pages, 4 figures, uses emulateapj.sty. Also available at http://www.stsci.edu/~oey Revised Figures

Scientific paper

10.1086/312921

A rudimentary, one-zone, closed-box model for inhomogeneous chemical evolution is offered as an alternative reference than the Simple model in the limit of no mixing. The metallicity distribution functions (MDFs) of Galactic halo and bulge stars can be matched by varying a single evolutionary parameter, nQ. Q is the filling factor of contaminating regions and n is the number of star-forming generations. Therefore, Q and n have equivalent roles, and combinations of n and Q yield systems with different metallicities at any given age. The model also revises interpretation of observed MDFs. Unevolved systems probe the parent distribution of metal production f(z), for example, the high-metallicity tail of the halo distribution agrees with a power-law f(z).

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