Paper:	A HIFI View of Circumstellar H2O Emission from the S-type AGB Star χ Cyg
Volume:	445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page:	613
Authors:	Maercker, M.; Schöier, F. L.; 3; Justtanont, K.; Olofsson, H.; and the HIFISTARS team
Abstract:	Accurate modelling of sensitive, and spectrally resolved, observations of H2O emisison lines is important for understanding the physics and chemistry of circumstellar envelopes around AGB stars. We present detailed non-local, non-LTE models of H2O emission lines observed towards the S-type AGB star χ Cyg with the HIFI instrument onboard Herschel. The models demonstrate the ability to constrain important physical and chemical parameters in the inner CSE close to the central star, emphasizing the importance of high-quality data from HIFI combined with detailed radiative transfer models.

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