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Fig. 6

image

Infrared photometric diagrams of stars located in the areas of NGC 3572, Trumpler 18, and NGC 3590. In the upper panels (a)c)), black lines show the intrinsic colors for MS stars according to (Koornneef 1983), arrows indicate the reddening paths, and lines indicate the limits adopted for the selection of YSO candidates (yellow open circles – see Sect. 3.2.3). In the lower panels (d)f)), we present decontaminated CMDs for each of the clusters (see Sect. 3.2.3). Gray lines are PMS isochrones (Siess et al. 2000) for four different ages in years.

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