Spatial distribution of the five clusters studied in this paper (filled circles) superimposed on known OCs (dots) from Dias et al. (2002). The Galaxy’s spiral arm positions (dashed areas), obtained from Reid et al. (2014), have been plotted for reference. The Sun’s position is shown by the intersection of the horizontal and vertical dotted lines. The location of the OCs studied here matches the position of some of the Galaxy’s spiral arms (see Sect. 5.2 for discussion).