Modelling OH in regions of star formation

Details Modelling OH in regions of star formation Modelling OH in regions of star formation

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.171..167d&link_type=abstract

(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640

Astronomy and Astrophysics

Astrophysics

Astronomical Models, Electron States, Hydroxyl Radicals, Star Formation, Ground State, H Ii Regions, Hyperfine Structure, Interstellar Masers, Line Spectra

Scientific paper

A large-velocity-gradient model of the OH populations in regions of star formation was developed using the lowest 48 hyperfine states of OH and including the phenomenon of FIR line overlap; a new theory was employed which treats all thermal and velocity overlaps. The model is used to interpret the OH absorption observations of Guilloteau et al. (1984) and Walmsley et al. (1986) for the compact H II region DR21. It is shown that, in studies of absorption and of masers, observations at several frequencies make it possible to reduce the number of possible interpretations.

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