Free Access
Volume 541, May 2012
Article Number A95
Number of page(s) 12
Section Interstellar and circumstellar matter
Published online 07 May 2012

Online material

Appendix A: Colour diagrams

thumbnail Fig. A.1

TCDs for the clusters Berkeley 86 (left) and NGC 2244 (right). The solid line shows a normal extinction law, while the fitting for the cluster members is shown by a dotted line. Two extinction vectors (AV = 2 mag) related to different values of RV are plotted in the bottom panels, for illustration. Open circles indicate the members and crosses show the stars with P% < Pmin.

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thumbnail Fig. A.2

TCDs for NGC 2264 (left) and NGC 6530 (right).

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thumbnail Fig. A.3

Top: reddened ZAMS fitting to the cluster members with P% > Pmin (open circles). The position of the other stars of the sample is indicated by crosses. A full line shows the curve obtained with the fitting algorithm, while the dotted line shows the intrinsic U − B and B − V colours. Bottom: curves representing the limit ΔE(B − V) = 0.11 suggested by Burki (1975). From left to right: Berkeley 86, NGC 2244, NGC 2264, and NGC 6530.

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© ESO, 2012

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