Circumstellar H2O in M-type AGB stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Agb And Post-Agb, Circumstellar Matter, Mass Loss

Scientific paper

Surprisingly high amounts of H2O have recently been reported in the circumstellar envelope around the M-type AGB star W Hya. However, substantial uncertainties remain, as the required radiative transfer modelling is difficult due to high optical depths, sub-thermal excitation and the sensitivity to the combined radiation field from the central star and dust grains.

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