Composite observational CMD for Dolidze 25 and stars in its neighbourhood. Small open circles represent likely cluster members selected from 2MASS. Accompanying numbers indicate that the star is also a photometric member in Turbide & Moffat (1993) or Delgado et al. (2010). Large filled (blue) circles are members with spectroscopy. (Green) diamonds represent stars in the cluster neighbourhood. The emission-line stars discussed in Sect. 3.3 are represented by squares. The lines are 2 Ma Geneva (Ekström et al. 2012; Georgy et al. 2013) isochrones for fast rotation at Z = 0.014 (thick lines) and Z = 0.002, displaced to DM = 13.2, with different amounts of extinction (see text). For clarity star numbers from WEBDA are shown without any prefix.