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The distance and formation history of the very young open cluster NGC 6530 were investigated by study- ing a total of 132 probable member stars of this open cluster. It was concluded that the distance to NGC 6530 is 1:8 0:2 kpc, and its interstellar reddening E(B V ) is 0: m 30. Furthermore, we conclude that the extinction law of the intracluster material is normal (i.e. RV =3 :1), but anomalous extinction laws were found for several more embedded stars in the cluster. Of the 132 stars included in this study, 11 are suspected to be variable, ve show H in emission and nine show an infrared excess. Among the member stars of NGC 6530, three were found to be part of the Herbig Ae/Be stellar class, whereas two others are possible members of this stellar group as well. Also, one cluster member is probably a new massive post-AGB star, whereas the same could possibly apply to another member star. Finally, from the distribution of post- and pre-main sequence stars in the cluster's HR-diagram, it was concluded that the process of star formation in NGC 6530 must have started a few times 10 7 years ago and, for the less massive stars, is probably still going on today.

A multiwavelength study of star formation in the very young open cluster NGC 6530