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We present a multi-wavelength study of the young stellar population in theCygnus-X DR15 region. We studied young stars forming or recently formed at andaround the tip of a prominent molecular pillar and an infrared dark cloud.Using a combination of ground based near-infrared, space based infrared andX-ray data, we constructed a point source catalog from which we identified 226young stellar sources, which we classified into evolutionary classes. Westudied their spatial distribution across the molecular gas structures andidentified several groups possibly belonging to distinct young star clusters.We obtained samples of these groups and constructed K-band luminosity functionsthat we compared with those of artificial clusters, allowing us to make firstorder estimates of the mean ages and age spreads of the groups. We used a$^{13}$CO(1-0) map to investigate the gas kinematics at the prominent gaseousenvelope of the central cluster in DR15, and we infer that the removal of thisenvelope is relatively slow compared to other cluster regions, in which gasdispersal timescale could be similar or shorter than the circumstellar diskdissipation timescale. The presence of other groups with slightly older ages,associated with much less prominent gaseous structures may imply that theevolution of young clusters in this part of the complex proceeds in periodsthat last 3 to 5 Myr, perhaps after a slow dissipation of their dense molecularcloud birthplaces.

The Young Stellar Population of the Cygnus-X DR15 Region