Near-Infrared photometry of LMC cluster Reticulum
M. Dall'Ora, G. Bono, J. Storm, V. Testa, G. Andreuzzi, R. Buonanno, F. Caputo, V. Castellani, C. E. Corsi, S. Degl'Innocenti, G. Marconi, M. Marconi, M. Monelli, V. Ripepi
Abstract
We present near-infrared (JKs) time series data of the Large Magellanic Cloud (LMC) cluster Reticulum. The observing strategy and data reduction (DAOPHOTII/ALLFRAME) allowed us to reach a photometry accuracy of the order of 0.02 mag at limiting magnitudes typical of RR Lyrae stars. We are interested in Reticulum, since it hosts a sizable sample of RR Lyrae (32), and therefore the use of the K-band Period-Luminosity-Metallicity (PLZK) relation will allow us to supply an accurate LMC distance evaluation. The main advantages in using this method is that it is marginally affected by off-ZAHB evolutionary effects and by reddening corrections. As a preliminary but robust result we find a true distance in good agreement with the LMC Cepheid distance scale, i.e. DM = 18.47 +- 0.07 mag.
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