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1 2011

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Photometric Study of the Star Cluster NGC 2155 in the Large Magellanic Cloud: Age Estimation and Variable Stars

Otulakowska M., Olech A., Pych W., Pamyatnykh A. A., Zdravkov T., Rucinski S. M.

Acta Astronomica

2011

Vol. 61, No. 2

161--177

We present results of new photometry for the globular star cluster NGC 2155 in the Large Magellanic Cloud (LMC). Our I- and V-band observations were obtained with the 6.5-m Magellan-1 Baade Telescope at Las Campanas Observatory resulting in deep photometry down to V≈24 mag. By analyzing the color-magnitude diagram for the cluster and utilizing the Victoria-Regina grid of 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 the age-metallicity relation for LMC clusters. Using the Difference Image Analysis Package (DIAPL), we detected 7 variable stars in the cluster field with variability at the level of 0.01 mag in the I-band. Three variable stars are particularly interesting: two SX Phe stars pulsating in the fundamental mode, and a detached eclipsing binary which is a prime candidate to estimate the distance to the cluster.