2005A&A...439..627J


Query : 2005A&A...439..627J

2005A&A...439..627J - Astronomy and Astrophysics, volume 439, 627-633 (2005/8-4)

W Hya through the eye of Odin Satellite observations of circumstellar submillimetre H2O line emission.

JUSTTANONT K., BERGMAN P., LARSSON B., OLOFSSON H., SCHOEIER F.L., FRISK U., HASEGAWA T., HJALMARSON A., KWOK S., OLBERG M., SANDQVIST A., VOLK K. and ELITZUR M.

Abstract (from CDS):

We present Odin observations of the AGB star W Hya in the ground-state transition of ortho-H2O, 110-101, at 557GHz. 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)x10–7M/yr, and a circumstellar H2O abundance of (2.0±1.0)x10–3. 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 ∼0.1M.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: evolution - stars: individual: W Hya - stars: late-type - stars: mass-loss - stars: AGB, post-AGB

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2239 0
2 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 622 0
3 V* R Cas Mi* 23 58 24.8682785040 +51 23 19.713029388 6.71 6.63 4.80     M6.5-9e 690 0

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2022.05.21-15:48:40

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