Webster, David; Bland-Hawthorn, Joss; Sutherland, Ralph
We model the chemical evolution of six ultra-faint dwarfs (UFDs): Bootes I, Canes Venatici II, Coma Berenices,
Hercules, Leo IV, and Ursa Major I based on their recently determined star formation histories. We show that two
single-age bursts cannot explain the observed [α/Fe] versus [Fe/H] distribution in these galaxies and that some selfenrichment
is required within the first burst. An alternative scenario is modeled, in which star formation is
continuous except for short interruptions...[Show more]
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