Fig. 3
Collinder 223: HR diagram. The age of this cluster is quite uncertain, from 25 Myr to 136 Myr, since the brightest stars are pnm. The isochrone curves are given by Ekström et al. (2012). Probable members of the clusters are denoted in • (blue) symbols, pnm in ⊙ (blue) and non-members in ■ (grey). Be star cluster members are indicated in ▴ (red), Be pnm in △ (red), and Be non-members in ◆ (black).
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