Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/6081
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dc.contributor.authorJose, J-
dc.contributor.authorPandey, A. K-
dc.contributor.authorSamal, M. R-
dc.contributor.authorOjha, D. K-
dc.contributor.authorOgura, K-
dc.contributor.authorKim, J. S-
dc.contributor.authorKobayashi, N-
dc.contributor.authorGoyal, A-
dc.contributor.authorChauhan, N-
dc.contributor.authorEswaraiah, C-
dc.date.accessioned2013-06-11T10:49:06Z-
dc.date.available2013-06-11T10:49:06Z-
dc.date.issued2013-07-11-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Vol. 432, No. 4, pp. 3445-3461en
dc.identifier.issn1365-2966-
dc.identifier.urihttp://hdl.handle.net/2248/6081-
dc.descriptionRestricted Accessen
dc.description.abstractIn this paper, an extensive survey of the star-forming complex Sh2-252 has been undertaken with an aim to explore its hidden young stellar population as well as to understand the structure and star formation history for the first time. This complex is composed of five prominent embedded clusters associated with the subregions A, C, E, NGC 2175s and Teu 136. We used Two Micron All Sky Survey-near-infrared and Spitzer-Infrared Array Camera, Multiband Imaging Photometer for Spitzer photometry to identify and classify the young stellar objects (YSOs) by their infrared (IR) excess emission. Using the IR colour–colour criteria, we identified 577 YSOs, of which, 163 are Class I, 400 are Class II and 14 are transition disc YSOs, suggesting a moderately rich number of YSOs in this complex. Spatial distribution of the candidate YSOs shows that they are mostly clustered around the subregions in the western half of the complex, suggesting enhanced star formation activity towards its west. Using the spectral energy distribution and optical colour–magnitude diagram-based age analyses, we derived probable evolutionary status of the subregions 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 semicircular shaped molecular shell composed of several clumps and YSOs bordering the western ionization front of Sh2-252. Our analyses suggest that next generation star formation is currently under way along this border and that possibly fragmentation of the matter collected during the expansion of the H ii region as one of the major processes is responsible for such stars. We observed the densest concentration of YSOs (mostly Class I, ∼0.5 Myr) at the western outskirts of the complex, within a molecular clump associated with water and methanol masers and we suggest that it is indeed a site of cluster formation at a very early evolutionary stage, sandwiched between the two relatively evolved CH ii regions A and B.en
dc.language.isoenen
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen
dc.relation.urihttp://dx.doi.org/10.1093/mnras/stt700en
dc.relation.urihttp://arxiv.org/abs/1304.5327en
dc.rights© Royal Astronomical Societyen
dc.subjectStars: formationen
dc.subjectStars: pre-main-sequenceen
dc.subjectH ii regionsen
dc.subjectISM: individual objects: Sh2-252en
dc.subjectInfrared: ISMen
dc.titleYoung stellar population and ongoing star formation in the H ii complex Sh2-252en
dc.typeArticleen
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