  Obtain time-series photometry of the very crowded central regions of Galactic
globular clusters with better angular resolution than previously achieved with
conventional CCDs on ground-based telescopes to complete, or improve, the
census of the variable star population in those stellar systems. Images were
taken using the Danish 1.54-m Telescope at the ESO observatory at La Silla in
Chile. The telescope was equipped with an electron-multiplying CCD and the
short-exposure-time images obtained (10 images per second) were stacked using
the shift-and-add technique to produce the normal-exposure-time images
(minutes). Photometry was performed via difference image analysis. Automatic
detection of variable stars in the field was attempted. The light curves of
12541 stars in the cores of 10 globular clusters were statistically analysed in
order to automatically extract the variable stars. We obtained light curves for
31 previously known variable stars (3 L, 2 SR, 20 RR Lyrae, 1 SX Phe, 3
cataclysmic variables, 1 EW and 1 NC) and we discovered 30 new variables (16 L,
7 SR, 4 RR Lyrae, 1 SX Phe and 2 NC).
