  Recent high spatial resolution observations of gas and dust in the
circumstellar envelopes (CSEs) of AGB stars indicate morphologies much more
complex than the smooth density distributions generated by spherically
symmetric, constant mass loss rates. In particular, the observation of spiral
arcs and disks indicate the likely presence of a binary companion which in some
cases give rise to the UV photons detected by GALEX. In this Article, we extend
our recent model of the chemistry in a clumpy, porous CSE around an AGB star to
include the influence of stellar blackbody photons on the CSE chemistry. Our
results indicate that internal photons, in a clumpy, porous CSE, can alter
chemistry within a few stellar radii and, for some molecules, alter abundances
out to several hundred stellar radii. They further suggest that harder
radiation from companion stars or accretion disks will have a substantial
impact on chemistry in the dust formation zones and inner CSEs of AGB stars.
