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We present results of a high resolution study of the filamentary infrareddark cloud G192.76+00.10 in the S254-S258 OB complex in several molecularspecies tracing different physical conditions. These include threeisotopologues of carbon monoxide (CO), ammonia (NH$_3$), carbon monosulfide(CS). The aim of this work is to study the general structure and kinematics ofthe filamentary cloud, its fragmentation and physical parameters. The gastemperature is derived from the NH$_3 $ $(J,K) = (1,1), (2,2)$ and$^{12}$CO(2--1) lines and the $^{13}$CO(1--0), $^{13}$CO(2--1) emission is usedto investigate the overall gas distribution and kinematics. Several denseclumps are identified from the CS(2--1) data. Values of the gas temperature liein the ranges $10-35$ K, column density $N(\mathrm{H}_2)$ reaches the value 5.110$^{22}$ cm$^{-2}$. The width of the filament is of order 1 pc. The masses ofthe dense clumps range from $ \sim 30 $ M$_\odot$ to $ \sim 160 $ M$_\odot$.They appear to be gravitationally unstable. The molecular emission shows a gasdynamical coherence along the filament. The velocity pattern may indicatelongitudinal collapse.

Study of the filamentary infrared dark cloud G192.76+00.10 in the S254-S258 OB complex