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Fig. 1


Dereddened (HK)0 vs. K0 diagram of the Galactic centre field using the data of Nishiyama et al. (2009) and the extinction map of Schultheis et al. (2009). In red, we indicate our selected M giants. The blue lines show the Padova isochrones with Z = 0.008, τ = 1 Gyr (solid line), and τ = 10 Gyr (dashed line), while the green line is at Z = 0.06 and τ = 10 Gyr. The arrow on the top right shows the extinction vector of AK = 1 mag (Nishiyama et al. 2009).

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