Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..394e&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 394-408. Research supported by the Research Corp.
Astronomy and Astrophysics
Astronomy
48
Gas Temperature, Interstellar Gas, Molecular Clouds, Near Infrared Radiation, Stellar Evolution, Abundance, Cosmic Dust, Emission Spectra, Gas Density, H Ii Regions, Infrared Astronomy, Interstellar Masers, Mass, Size Determination
Scientific paper
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 3000-4000 solar masses. More detailed studies near the region of active star formation yield estimates of density (approximately 200,000-500,000/cu cm) and the abundances of H2CO, HCO(+), HCN, and (C-13)O. 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.
Blair Guy N.
Evans Neal J. II
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