Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets

preprint2011arXivOpen access

Abstract

(Abridged) Poorly-populated star clusters may have photometric and structural properties not much different from asterisms, to the point that, in some cases, widely-used databases present conflicting classifications. We investigate the nature of a sample of challenging targets that have been classified either as star clusters or asterisms in different studies. A few objects are studied for the first time.

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