Isolating the pre-main sequence in Collinder 34 , NGC 3293 , NGC 3766 and NGC 6231

Abstract

We employed field star decontaminated Two Micron All Sky Survey photometry to study four nearby optical embedded clusters – Collinder 34, NGC 3293, NGC 3766 and NGC 6231 – obtaining deep colour–magnitude diagrams and stellar radial density profiles. We found what seem to be pre-main sequences detached in different amounts from main sequences in these… (More)

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