Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.6707d&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #67.07; Bulletin of the American Astronomical Society, Vol. 24, p.1227
Physics
Scientific paper
Circumstellar Envelopes (CSEs) are rich chemical environments. To date over 20 different molecules already observed in some objects. Previous models for CSEs have all suffered from omissions of some important effects or processes, e.g., ignore detailed chemistry, neglect certain radiation transport effects such as CO self-shielding. Here we attempt to model in detail the physics and chemistry of CSEs. The goal is to develop a comprehensive model in which both chemical evolution and radiation transport are treated self-consistently. In our model we have included a large chemical reaction network and solved the radiation transport problem accurately for both line and continuum. In particular, we have studied how each of the following affects the photodissociation of CO and the ensuing ion-molecule chemistry: 1) analytic vs. accurate treatments of radiative transfer in dust 2) omission vs. inclusion of H2 shielding and self-shielding of CO 3) omission vs. inclusion of H2 photodissociation 4) simple vs. detailed gas-phase chemical reaction networks. In general, we find that each of these has a large effect, by over a factor of 10, on the abundance of many chemical species. We conclude that, in approximate order of importance, one should include both the CO and H2 shielding, H2 dissociation, self-consistent solution the radiative transfer through dust, and detailed chemistry. This research has been paritally supported by grants and a fellowship from the US Air Force and NASA.
Doty Steven D.
Leung Man Chun
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