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Deep photometry of crowded fields, such as Galactic Globular Clusters, isseverely limited by the actual resolution of ground-based telescopes. On theother hand, the Hubble Space Telescope does not provide the near-infrared (NIR)filters needed to allow large color baselines. In this work we aim atdemonstrating how ground based observations can reach the required resolutionwhen using Multi-Conjugated Adaptive Optic (MCAO) devices in the NIR, such asthe experimental infrared camera (MAD) available on the VLT. This isparticularly important since these corrections are planned to be available onall ground--based telescopes in the near future. We do this by combining theinfrared photometry obtained by MAD/VLT with ACS/HST optical photometry of ourscientific target, the bulge globular cluster NGC 6388, in which we imaged twofields. In particular, we constructed color-magnitude diagrams with anextremely wide color baseline in order to investigate the presence of multiplestellar populations in this cluster. From the analysis of the external field,observed with better seeing conditions, we derived the deepest optical-NIR CMDof NGC 6388 to date. The high-precision photometry reveals that two distinctsub-giant branches are clearly present in this cluster. We also use the CMDfrom the central region to estimate the distance ((m-M)=15.33) and thereddening (E(B-V)=0.38) for this cluster. We estimate the age to be ~11.5+/-1.5 Gyr. The large relative-age error reflects the bimodal distribution of theSGB stars. This study clearly demonstrates how MCAO correction in the NIR bandsimplemented on ground based telescopes can complement the high-resolutionoptical data from HST.

MCAO near-IR photometry of the Globular Cluster NGC 6388: MAD observations in crowded fields