A New Look at Simple Inhomogeneous Chemical Evolution
M.S. Oey
A rudimentary, one-zone, closed-box model for inhomogeneous chemical
evolution is offered as an alternative reference to 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). The Galactic disk G-dwarf Problem also improves.
ApJ Letters, 542, L25
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