ISO LWS Observations of H2O from R Cas: A Consistent Model For Its Circumstellar Envelope |
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| Authors: | Truong-Bach Nguyen-Q-Rieu RJ Sylvester MJ Barlow XW Liu T Lim A Omont P Cox CJ Skinner |
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| Institution: | (1) Observatoire de Paris, DEMIRM, 61 avenue de l'Observatoire, F-75014 Paris, France;(2) Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT, UK;(3) The LWS Instrument-Dedicated Team, ISO Science Operations Center, P.O. Box 50727, E-28080 Madrid, Spain;(4) Institut d'Astrophysique, 98bis boulevard Arago, F-75014 Paris, France;(5) Institut d'Astrophysique Spatiale, Universite Paris XI, Bat 120, F-91405 Orsay, France;(6) Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA |
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| Abstract: | We present an ISO LWS 43-197 µm grating spectrum of the oxygen-rich AGB star R Cas. The spectrum is rich of isolated and blended H2O lines. For their identification and in order to determine the physical parameters of the circumstellar envelope, we have constructed a model which treats radiative transfer, chemical exchange and photodissociation reactions, and various heating and cooling processes in a consistent manner. By fitting the observed line fluxes and using stellar parameters based upon the Hipparcos distance, we derived a mass-loss rate of M = 1 10-6 M⊙ yr-1 which is close to the value 6 10-7 M⊙ yr-1 previously derived for W Hya, another oxygen-rich AGB star. |
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