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Spherical asymmetries are prevalent within the outflows of AGB stars. Sincebinary interaction with a stellar or planetary companion is thought to be theunderlying mechanism behind large-scale structures, we included the effects ofUV radiation originating from a stellar companion in our chemical kineticsmodel. The one-dimensional model provides a first approximation of its effectson the chemistry throughout the outflow. The presence of a close-by stellarcompanion can strongly influence the chemistry within the entire outflow. Itsimpact depends on the intensity of the radiation (set by the stellar radius andblackbody temperature) and on the extinction the UV radiation experiences (setby the outflow density, density structure, and assumed radius of dustformation). Parent species can be photodissociated by the companion, initiatinga rich photon-driven chemistry in the inner parts of the outflow. The outcomedepends on the balance between two-body reactions and photoreactions. Iftwo-body reactions dominate, chemical complexity within the outflow increases.This can make the abundance profiles of daughters appear like those of parents,with a larger inner abundance and a gaussian decline. If photoreactionsdominate, the outflow can appear molecule-poor. We model three stellarcompanions. The impact of a red dwarf companion is limited. Solar-likecompanions show the largest effect, followed by a white dwarf. A stellarcompanion can also lead to the formation of unexpected species. The outflow'smolecular content, especially combined with abundance profiles, can indicate astellar companion's presence. Our results pave the way for furtheroutflow-specific (three-dimensional) model development.

The impact of stellar companion UV photons on the chemistry of the circumstellar environments of AGB stars