Collapsing molecular clouds

Details Collapsing molecular clouds Collapsing molecular clouds

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194l.103l&link_type=abstract

Astrophysical Journal, vol. 194, Dec. 1, 1974, pt. 2, p. L103-L107. Research supported by the Research Corp.

Physics

48

Carbon Monoxide, Cloud Physics, Gravitational Collapse, Interstellar Gas, Molecular Spectra, Stellar Spectra, A Stars, Astronomical Models, B Stars, Emission Spectra, Line Spectra, Nebulae

Scientific paper

Observations of CO emission have been made of the molecular clouds surrounding the emission-line stars R CrA and LkH-alpha 198 and a cloud in the reflection nebulosity association Mon R2. In all three clouds the C-12O-16 J = 1-0 line width shows systematic variations with position in the cloud, the widest lines occurring at the positions of the central stars in the R CrA and LkH-alpha 198 clouds and at the position of peak line intensity in the Mon R2 cloud. For the clouds associated with the emission-line stars the C-13O-16 lines are narrower than the C-12O-16 lines and show less pronounced line width variation. In the Mon R2 cloud, the C-13O-16 line width variations are easily seen. The line width behavior cannot be explained in detail by any of the models currently proposed for molecular clouds. If the clouds are indeed collapsing, the collapse velocity is inversely proportional to some power of the distance from the center of collapse.

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