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We use HST observations to study the LMC's young cluster NGC1844. We estimatethe fraction and the mass-ratio distribution of photometric binaries and reportthat the main sequence presents an intrinsic breadth which can not be explainedin terms of photometric errors only, and is unlikely due to differentialreddening. We attempt some interpretation of this feature, including stellarrotation, binary stars, and the presence of multiple stellar populations withdifferent age, metallicity, helium, or C+N+O abundance. Although we excludeage, helium, and C+N+O variations to be responsible of the main-sequence spreadnone of the other interpretations is conclusive.

Multiple stellar populations in Magellanic Cloud clusters. II. Evidence also in the young NGC1844?