Abstract Details

Name: neelam panwar
Affiliation: Aryabhatta Research Institute of Observational Sciences, Nainital, 263001
Conference ID: ASI2021_507
Title : Star Formation and Evolution of the HII Region Sh2-112
Authors and Co-Authors : Neelam Panwar
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Here, I will present the observational results of our multiwavelength study of an HII region Sh2-112 that is powered by the massive O8V-type star BD +45 3216. The surface density distribution and minimum spanning tree analyses of the young stellar object (YSO) candidates in the region reveal their groupings toward the western periphery of the HII region. We found a GMRT radio continuum emission peak toward the northwest boundary of the HII region that is investigated as a compact/ultracompact HII region candidate powered by a B0-B0.5-type star. Toward the southwest direction, a prominent curved rim-like structure is found in the Hα image and GMRT radio continuum maps, where the H2 and 13CO emission is also observed. These results suggest the existence of the ionized boundary layer (IBL) on the surface of the molecular cloud. This IBL is found to be overpressured with respect to the internal pressure of the surrounding molecular cloud. This implies that the shocks are propagating/propagated into the molecular cloud, and the young stars identified within it are likely triggered due to the massive star. We also found that this region is ionization-bounded toward the west and density-bounded toward the east. Based on the distribution of the ionized gas, molecular material, and YSO candidates, we proposed that the Sh2-112 HII region is a good candidate for the blister-type HII region that has been evolved on the surface of a cylindrical molecular cloud.