CMD of star-like sources within 1.9′ of the SMC star cluster NGC 121. In the left panel different colours indicate objects with a different probability of being cluster members: 100% (black), 75% (blue), and 50% (cyan). In the right panel only sources within 3σ of the cluster proper motion listed in Table 4 and within the same radius are shown. A PARSEC isochrone, assuming (m − M)0 = 18.9 mag and E(B − V) = 0.04 mag, indicates a 10.6 Gyr old population with [ Fe / H ] = −1.19 dex.
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