New non-LTE abundances for three Bootes I stars show an alpha-element transition at [Fe/H] between -3 and -2, interpreted as the onset of type Ia supernova contributions in this ultra-faint dwarf galaxy.
@doi [ ] 10.1051/0004-6361/200912833, http://esoads.eso.org/abs/2009A
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Contribution of type Ia supernovae to the chemical enrichment of the ultra-faint dwarf galaxy Bootes I
New non-LTE abundances for three Bootes I stars show an alpha-element transition at [Fe/H] between -3 and -2, interpreted as the onset of type Ia supernova contributions in this ultra-faint dwarf galaxy.