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We present results of new photometry for the globular star cluster NGC 2155in the Large Magellanic Cloud (LMC). Our I- and V-band observations wereobtained with the 6.5-meter Magellan 1 Baade Telescope at Las CampanasObservatory resulting in deep photometry down to V ~ 24 mag. By analyzing thecolor-magnitude diagram for the cluster and utilizing the Victoria-Regina gridof isochrones models we estimated the age of the cluster at ~ 2.25 Gyr and[Fe/H]=-0.71, the numbers which place NGC 2155 outside the age-gap in theage-metallicity relation for LMC clusters. Using the Difference Image AnalysisPackage (DIAPL), we detected 7 variable stars in the cluster field withvariability at the level of 0.01 magnitude in the I-band. Three variables areparticularly interesting: two SX Phoenicis (SX Phe) stars pulsating in thefundamental mode, and a detached eclipsing binary which is a prime candidate toestimate the distance to the cluster.

Photometric study of the star cluster NGC 2155 in the Large Magellanic Cloud: age estimation and variable stars