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OH masers in oxygen-rich late-type stars

Published online by Cambridge University Press:  03 August 2017

Sandra Etoka
Affiliation:
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, UK
A.M. Le Squeren
Affiliation:
GRAAL, Université de Montpellier II, F-34095 Montpellier Cedex. France

Abstract

We present here some noteworthy results of two related studies on oxygen-rich late type stars. The aim of this work was to study the OH circumstellar shell properties in terms of evolution. These studies are based on an OH monitoring programme carried out with the Nançay Radio Telescope. The first study concerns seven Miras distributed along the colour-colour diagram. They were observed at two or three different epochs covering one to seven cycles over a period from 1980 to 1995 at 1612, 1667 and 1665 MHz in both circular polarizations. The second study concerns thirty objects covering a wide range of mass loss rate from Miras to OH/IR stars. They were observed in 1994 at 1665 & 1667 MHz in both circular polarizations.

Type
Part 2. Stellar Masers
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

David, P., Le Squeren, A.M., Sivagnanam, P. & Braz, M.A. 1993, A&A 98, 245 Google Scholar
Etoka, S. & Le Squeren, A.M., 2000, A&AS 146, 179 Google Scholar
Sivagnanam, P., Braz, M.A., Le Squeren, A.M. & Tran Minh, F. 1990, A&A 233, 112 Google Scholar
van der Veen, W.E.C.J. & Habing, H.J. 1988, A&A 194, 125 Google Scholar
van der Veen, W.E.C.J. & Rugers, M. 1989, A&A 226, 183 Google Scholar
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