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In this paper an extensive survey of the star forming complex Sh2-252 hasbeen undertaken with an aim to explore its hidden young stellar population aswell as to understand the structure and star formation history. This complex iscomposed of five embedded clusters associated with the sub-regions A, C, E, NGC2175s and Teu 136. Using 2MASS-NIR and Spitzer-IRAC, MIPS photometry weidentified 577 young stellar objects (YSOs), of which, 163 are Class I, 400 areClass II and 14 are transition disk YSOs. Spatial distribution of the candidateYSOs shows that they are mostly clustered around the sub-regions in the westernhalf of the complex, suggesting enhanced star formation activity towards itswest. Using the spectral energy distribution and optical colour-magnitudediagram based age analyses, we derived probable evolutionary status of thesub-regions of Sh2-252. Our analysis shows that the region A is the youngest (~0.5 Myr), the regions B, C and E are of similar evolutionary stage (~ 1-2 Myr)and the clusters NGC 2175s and Teu 136 are slightly evolved (~ 2-3 Myr).Morphology of the region in the 1.1 mm map shows a semi-circular shapedmolecular shell composed of several clumps and YSOs bordering the westernionization front of Sh2-252. Our analyses suggest that next generation starformation is currently under way along this border and that possiblyfragmentation of the matter collected during the expansion of the HII region asone of the major processes responsible for such stars. We observed the densestconcentration of YSOs (mostly Class I, ~ 0.5 Myr) at the western outskirts ofthe complex, within a molecular clump associated with water and methanol masersand we suggest that it is indeed a site of cluster formation at a very earlyevolutionary stage, sandwiched between the two relatively evolved CHII regionsA and B.

Young stellar population and ongoing star formation in the HII complex Sh2-252