Circumstellar water vapour in M-type AGB stars: radiative transfer models, abundances, and predictions for HIFI
Circumstellar water vapour in M-type AGB stars: radiative transfer models, abundances, and predictions for HIFI
Context.Surprisingly high amounts of H2O have recently been reported in the circumstellar envelope around the M-type asymptotic giant branch star W Hya. This has lead to the speculation that evaporation of icy cometary or planetary bodies might be an effective ongoing mechanism in such systems. However, substantial uncertainties remain, as …