The photochemistry of carbon-rich circumstellar shells

Details The photochemistry of carbon-rich circumstellar shells The photochemistry of carbon-rich circumstellar shells

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..201h&link_type=abstract

Astrophysical Journal, Part 1, vol. 252, Jan. 1, 1982, p. 201-207. Research supported by the New York University;

Astronomy and Astrophysics

Astrophysics

96

Atmospheric Chemistry, Carbon, Photochemical Reactions, Photons, Reaction Kinetics, Stellar Envelopes, Abundance, Kinetic Equations, Molecular Interactions, Optical Thickness, Polyatomic Molecules, Radiation Shielding, Shells (Structural Forms), Stellar Atmospheres, Stellar Mass Ejection, Time Dependence

Scientific paper

The effect of ambient ultraviolet photons on the chemical structure of carbon-rich, circumstellar envelopes is investigated with a simple formulation of the time-dependent, photochemical rate equations valid for optically thick shells. Molecules injected into the shielded inner envelope are broken down when they reach the outer regions where ambient ultraviolet photons can penetrate. A quantitative description of the abundance variations is obtained for the case of uniform expansion by detailed consideration of the shielding of the radiation by the dust and molecules of the envelope. Representative results are presented to illustrate the role of shielding in defining the extent of molecular envelopes, the formation of C I and C II shells by photodestruction of carbon-bearing molecules, and the development of layered chemical structures from the photobreakup of polyatomic molecules. Photochemistry makes the outer parts of thick, carbon-rich envelopes into complex regions containing radicals, ions, and atoms which are of considerable observational and theoretical interest.

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