Abstract
The spectral and reddening properties of 211 highly reddened proper-motion members with V 70 per cent) of programme stars in NGC 1976, NGC 2244, NGC 6530 and NGC 6611 show anomalous reddening with R V = 4.78 ± 0.10, 3.54 ± 0.04, 3.87 ± 0.05 and 3.56 ± 0.02, respectively, indicating the presence of grain size dust larger than that typical of the diffuse medium. A small number of stars in NGC 1976, NGC 2244 and NGC 6611 also show normal behaviour while the cluster NGC 6823 appears to have normal reddening. Three highly luminous late-type giants, one in NGC 2244 and two in NGC 6530, appear to be members and are in post-hydrogen-core-burning stages, suggesting a prolonged duration (∼25 Myr) of star formation.
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