Infrared variable stars in the compact elliptical galaxy M32
  Variable stars in the compact elliptical galaxy M32 are identified, using
three epochs of photometry from the Spitzer Space Telescope at 3.6 and 4.5
$\mu$m, separated by 32 to 381 days. We present a high-fidelity catalogue of
sources detected in multiple epochs at both 3.6 and 4.5 $\mu$m, which we
analysed for stellar variability using a joint probability error-weighted flux
difference. Of these, 83 stars are identified as candidate large-amplitude,
long-period variables, with 28 considered high-confidence variables. The
majority of the variable stars are classified as asymptotic giant branch star
candidates using colour-magnitude diagrams. We find no evidence supporting a
younger, infrared-bright stellar population in our M32 field.
