The energetics of molecular clouds. III - The S235 molecular cloud
Copyright policy )The energetics of molecular clouds. III - The S235 molecular cloud
The molecular cloud associated with the S235 H II region has been studied by means of molecular lines and near-infrared observations. The cloud consists of two components, one of which partly surrounds the S235 H II region. The other component contains a dense, hot region of active star formation, marked by self-reversed CO profiles, compact H II regions, masers, and infrared sources. From the molecular line data, the size and mass of the two components are estimated to be 6--8 pc and 3--4 x 10/sup 3/ M/sub sun/. More detailed studies near the region of active star formation yield estimates of density (approx.2--5 x 10/sup 5/ cm/sup -3/) and the abundances of H/sub 2/CO, HCO/sup +/, HCN, and /sup 13/CO. Analysis of the energetics suggests that the cloud is heated by the exciting star of S235 and by the exciting stars of the compact H II regions. Assuming that the gas is heated by collisions with warm dust grains, the far-infrared luminosity has been predicted. The observations of far-infrared emission are in reasonable agreement with predictions.
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