Efficiency of 1612 MHz maser emission from OH/IR stars

Details Efficiency of 1612 MHz maser emission from OH/IR stars Efficiency of 1612 MHz maser emission from OH/IR stars

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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