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Fig. 7


Left: JHKs colour–colour diagram for stars in the CG 1 head. The stars with (J-H) and/or (H-Ks) error larger than 0.m1 are plotted using a small size symbol. The Bessell & Brett (1988) main-sequence transformed to the 2MASS photometric system is also plotted. The arrow shows the effect of 5m of visual extinction in the diagram according to the Bessell & Brett (1988) reddening law. Right: as on the left, but for stars observed at the reference position.

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