Kinematics of the H II region sharpless 142. III - Molecular line observations and analysis of the IRAS data

Details Kinematics of the H II region sharpless 142. III - Molecular line observations and analysis of the IRAS data Kinematics of the H II region sharpless 142. III - Molecular line observations and analysis of the IRAS data

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332.1030j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 1030-1048. CNRS-NSERC-supported research.

Astronomy and Astrophysics

Astronomy

6

H Ii Regions, Line Spectra, Molecular Clouds, Molecular Spectra, Spectrum Analysis, Carbon Isotopes, Carbon Monoxide, Electron Transitions, Infrared Astronomy Satellite, Shock Wave Interaction

Scientific paper

The molecular cloud associated with the H II region S142 has been mapped in the J = 1-0 transition lines of (C-12)O and (C-13)O. It is found that the molecular cloud has two components separated by 25 parsecs and has a total mass of about 5600 solar masses. High-resolution observations in these transition lines reveal the presence of condensations in the molecular cloud. An analysis of IRAS data is presented, showing that the IR thermal continuum emission has a larger extent at 100 microns than at 12 microns. The mean dust color temperature is shown to be 169 K for the hot, small grains, and 34 K for the colder, larger grains. It is shown that the total dust mass is about 60 solar masses and the total IR flux is 8.5 + or - 0.8 X 10 to the -10 W/sq m. A gas-to-dust ratio of about 200 is derived for the gas complex S142. A mass of 1000 solar masses is found for the stellar cluster associated with S142. The star formation efficiency for the S142 gas complex is estimated at about 8 percent.

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