Fig. 10
Colour–magnitude diagram of a sample of metal-poor RGB stars belonging to the Boötes I dwarf spheroidal galaxy that have spectroscopic [Fe/H] determinations (Norris et al. 2008). Theoretical isochrones for an age of 12.5 Gyr and the labelled [Fe/H] values (for an α-enhanced metal mixture) are also displayed (see text for details).
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