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W Hya through the eye of Odin. Satellite observations of circumstellar submillimetre H2O line emission
Stockholm University, Faculty of Science, Department of Astronomy.
Onsala Space Observatory.
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
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2005 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 439, 627-633 p.Article in journal (Refereed) Published
Abstract [en]

We present Odin observations of the AGB star W Hya in the ground-state transition of ortho-H{2}O, 1{10}-101, at 557 GHz. The line is clearly of circumstellar origin. Radiative transfer modelling of the water lines observed by Odin and ISO results in a mass-loss rate of (2.5±0.5)×10-7 Mȯ yr-1, and a circumstellar H{2}O abundance of (2.0±1.0)×10-3. The inferred mass-loss rate is consistent with that obtained from modelling the circumstellar CO radio line emission, and also with that obtained from the dust emission modelling combined with a dynamical model for the outflow. The very high water abundance, higher than the cosmic oxygen abundance, can be explained by invoking an injection of excess water from evaporating icy bodies in the system. The required extra mass of water is quite small, on the order of 0.1 Moplus.

Place, publisher, year, edition, pages
2005. Vol. 439, 627-633 p.
Keyword [en]
stars: circumstellar matter, stars: evolution, stars: individual: W Hya, stars: late-type, stars: mass-loss, stars: AGB and post-AGB
Research subject
Astronomy
Identifiers
URN: urn:nbn:se:su:diva-30904DOI: 10.1051/0004-6361:20052969OAI: oai:DiVA.org:su-30904DiVA: diva2:274736
Available from: 2009-10-30 Created: 2009-10-30 Last updated: 2017-12-12Bibliographically approved

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