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New candidate variable stars have been identified in the Small MagellanicCloud cluster NGC121, by applying both the image subtraction technique (ISIS,Alard 2000) and the Welch & Stetson (1993) detection method to HST WFPC2archive and ACS proprietary images of the cluster. The new candidate variablestars are located from the cluster's Main Sequence up to Red Giant Branch.Twenty-seven of them fall on the cluster Horizontal Branch and are very likelyRR Lyrae stars. They include the few RR Lyrae stars already discussed by Walker& Mack (1988). We also detected 20 Dwarf Cepheid candidates in the centralregion of NGC121. Our results confirm the "true" globular cluster nature ofNGC121, a cluster that is at the young end of the Galactic globulars' agerange.

Detection of new variable stars in the SMC cluster NGC 121