Star and Cluster Formation in the Sh2-112 Filamentary Cloud Complex

We present the star formation activity around the emission nebula Sh2-112. At a distance of similar to 2.1 kpc, this H ii complex, itself 3 pc in radius, is illuminated by the massive star (O8 V) BD+45 3216. The associated molecular cloud extends in angular scales of 2.degrees 0 x 0.degrees 83, corresponding to linear sizes of 73 pc by 30 pc, along the Galactic longitude. The high-resolution (30 '') extinction map reveals a chain of dust clumps aligned with the filament-like structure with an average extinction of A ( V ) similar to 2.78 mag, varying up to a maximum of similar to 17 mag. Our analysis led to identification of a rich population (similar to 500) of young (average age of similar to 1 Myr) stars, plus a numerous number (similar to 350) of H alpha emitters, spatially correlated with the filamentary clouds. Located near the edge of the cloud, the luminous star BD+45 3216 has created an arc-like pattern as the ionizing radiation encounters the dense gas, forming a blister-shaped morphology. We found three distinct young stellar groups, all coincident with relatively dense parts of the cloud complex, signifying ongoing star formation. Moreover, the cloud filament (excitation temperature similar to 10 K) traced by the CO isotopologues and extending nearly similar to 80 pc is devoid of ionized gas except at the dense cores (excitation temperature similar to 28-32 K) wherein significant ionized emission excited by OB stars (dynamical age similar to 0.18-1.0 Myr) pertains. The radial velocity is dynamic (median similar to-3.65 km s(-1)) along the main filament, increasing from Galactic east to west, indicating mass flow to form the massive stars/clusters at the central hubs.