Modelling of Circumstellar H_2O Line Emission from M-type AGB Stars

Details Modelling of Circumstellar H_2O Line Emission from M-type AGB Stars Modelling of Circumstellar H_2O Line Emission from M-type AGB Stars

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..378..317m&link_type=abstract

Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes. ASP Conference Series, Vol. 378, proceedings of the co

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results of modelling circumstellar H_2O line emission toward 6 M--type AGB stars. Model line intensities are fit to ISO LWS data between 43 and 197 μm. In the cases of W Hya and R Dor the ortho--H_2O ground-state line at 557 GHz observed with the Odin satellite is also included. An ALI code is used to handle the high optical depths involved in the H_2O excitation analysis. The estimated circumstellar ortho--H_2O abundances span the range (0.3 -- 15) × 10-4, possibly indicating the importance of several competing processes such as freeze-out onto dust grains, non-equilibrium chemistry, and, more speculatively, evaporation of comets.

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