Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..311b&link_type=abstract
Astronomy and Astrophysics, vol. 84, no. 3, Apr. 1980, p. 311-316.
Astronomy and Astrophysics
Astrophysics
75
Far Infrared Radiation, Hydroxyl Emission, Interstellar Masers, Stellar Envelopes, Variable Stars, Centimeter Waves, Doppler Effect, Infrared Lasers, Laser Pumping
Scientific paper
The pumping of 18 cm OH masers by the overlap of far infrared lines in an expanding or collapsing medium is analyzed, with a particular reference to circumstellar envelopes. The IR intensity absorbed in one far IR line is strongly perturbed by Doppler shifted absorption or emission of another IR line at other points in the envelope. Strong 18 cm inversions can result. A detailed model taking into account the great number of relevant overlaps is presented. Main line intensities of circumstellar masers are easily accounted for, and the emission of the 1612 MHz line is also enhanced by the overlap effects. The pumping by far IR line overlap due to a large scale velocity field is probably more effective by an order of magnitude than all the other pumping mechanisms so far suggested for circumstellar main line masers.
Bujarrabal Valentin
Guibert Jean
Nguyen-Q-Rieu
Omont Alain
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