Water maser emission from OH/IR stars

Details Water maser emission from OH/IR stars Water maser emission from OH/IR stars

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..129e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 129-144.

Astronomy and Astrophysics

Astronomy

71

Hydroxyl Emission, Infrared Stars, Stellar Envelopes, Water Masers, Infrared Astronomy Satellite, Late Stars, Least Squares Method, Stellar Motions

Scientific paper

H2O maser emission was searched for in 69 OH/IR stars. The authors detected 23 of them, 12 for the first time. The presence of H2O masers in the circumstellar shells of OH/IR stars seems to be common. The observations are consistent with models locating the H2O masers within the OH maser shell at distances on the order of 1015cm. The H2O masers vary as the infrared and OH emission, but less regularly, with amplitudes an order of magnitude greater than those of OH and possibly with a phase lag of 0.2. If real, the phase lag implies a collisional pump mechanism for the water maser. Luminosities of the water masers increase with mass loss rates, consistent with a linear relationship between both quantities, which is predicted by models of collisionally pumped H2O masers.

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