  We study the red giant populations of two dE galaxies, AM 1339-445 and AM
1343-452, with the aim of investigating the number and luminosity of any upper
asymptotic giant branch (AGB) stars present. The galaxies are members of the
Centaurus A group (D~3.8 Mpc) and are classified as outlying (R~350 kpc)
satellites of Cen A. The analysis is based on near-IR photometry for individual
red giant stars, derived from images obtained with ISAAC on the VLT. The
photometry, along with optical data derived from WFPC2 images retrieved from
the HST science archive, enable us to investigate the stellar populations of
the dEs in the vicinity of the red giant branch (RGB) tip. In both systems we
find stars above the RGB tip, which we interpret as intermediate-age upper-AGB
stars. The presence of such stars is indicative of extended star formation in
these dEs similar to that seen in many, but not all, dEs in the Local Group.
For AM 1339-445, the brightest of the upper-AGB stars have Mbol~-4.5 while
those in AM 1343-452 have Mbol~-4.8 mag. These luminosities suggest ages of
approximately 6.5+/-1 and 4+/-1 Gyr as estimates for the epoch of the last
episode of significant star formation in these systems. In both cases the
number of upper-AGB stars suggests that ~15% of the total stellar population is
in the form of intermediate-age stars, considerably less than is the case for
outlying dE satellites of the Milky Way such as Fornax and LeoI.
