Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..125r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 125-128.
Astronomy and Astrophysics
Astrophysics
7
Hydroxyl Emission, Infrared Stars, Interstellar Matter, Maser Outputs, Radiative Transfer, Stellar Mass Ejection, Stellar Envelopes, Velocity Distribution
Scientific paper
The efficiency of the 35-micron pumping mechanism of the 1612 MHz OH maser in the expanding envelopes around evolved stars is discussed from an observer's point of view. An approach for determination of this efficiency that differs from the approach used in previous publications is used. The mismatch between the predicted and the observed values leads to the conclusion that the proposed pumping scheme is too simple; it is more realistic to state that the stellar OH maser is pumped by several optically thin lines in the far infrared.
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