A survey for 22GHz water maser emission from the Arecibo set of OH/IR stars.

Details A survey for 22GHz water maser emission from the Arecibo set of OH/IR stars. A survey for 22GHz water maser emission from the Arecibo set of OH/IR stars.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..116..117e&link_type=abstract

Astronomy and Astrophysics Supplement, v.116, p.117-155

Astronomy and Astrophysics

Astrophysics

45

Masers, Stars: Agb, Circumstellar Matter, Radio Lines: Stars, Surveys

Scientific paper

We report here on our search for water masers from a set of 382 OH/IR stars identified at Arecibo from color selected IRAS sources. Maser emission with an integrated flux S_I_>10^-21^W.m^-2^ is detected from about half. The detection rate is highest for the bluest stars (>90% for IRAS(25-12)<-0.6) and decreases to =~30% for the reddest. We expect multiple observations, better sensitivity and improved positions to raise the eventual detection rate from this sample to about 75%. Some of the undetected OH/IR stars are proto planetary nebulae; most of the rest are stars with very heavy mass-loss rates. The morphological characteristics of our spectra are analyzed: this confirms our expectation that they generally evolve into double-peaked profiles at the higher mass loss rates. Emission in the velocity interval which is blue-shifted with respect to the stellar velocity is statistically stronger than emission from the red-shifted interval. The water outflow velocities reach 75+/-15% of the circumstellar expansion velocities exhibited by OH, while flux variations are rarely larger than a factor of 10.

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