Near-Infrared photometry of LMC cluster Reticulum

Details Near-Infrared photometry of LMC cluster Reticulum Near-Infrared photometry of LMC cluster Reticulum

2003-05-15

arxiv.org/abs/astro-ph/0305276v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, proceedings of "Stars in Galaxies", La Palma 2003. To appear in MmSAI. Uses mem.cls

Scientific paper

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 (PLZ_K) 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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