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OH/IR Stars: Dark Planetary Nebulae?
Published online by Cambridge University Press: 18 September 2017
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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.
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- Copyright © Reidel 1983
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