OH/IR Stars: Dark Planetary Nebulae?
- 1 January 1983
- journal article
- abstracts
- Published by Cambridge University Press (CUP) in Symposium - International Astronomical Union
- Vol. 103, 529-530
- https://doi.org/10.1017/s0074180900094298
Abstract
The OH maser emission from OH/IR stars (type IIb) originates from the thick circumstellar dust shell. As the envelope is expanding and the strongest maser emission comes from the front- and the backside, where the gain pathlength is longest, we can measure a definite phaselag (and hence a diameter) between front- and backside of the shell for all sources that are variable.Keywords
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