  Using the AAOmega instrument of the Anglo-Australian Telescope, we have
obtained medium-resolution near-infrared spectra of 10,500 stars in two-degree
fields centered on the galactic globular clusters 47 Tuc, NGC 288, M12, M30 and
M55. Radial velocities and equivalent widths of the infrared Ca II triplet
lines have been determined to constrain cluster membership, which in turn has
been used to study the angular extent of the clusters. From the analysis of
140-1000 member stars in each cluster, we do not find extended structures that
go beyond the tidal radii. For three cluster we estimate a 1% upper limit of
extra-tidal red giant branch stars. We detect systemic rotation in 47 Tuc and
M55.
