The araucaria project. the distance of the large magellanic cloud from near-infrared photometry of RR lyrae variables

Abstract

We have obtained deep infrared (IR) J- and K-band observations of five fields located in the Large Magellanic Cloud (LMC) bar with the ESO New Technology Telescope equipped with the SOFI IR camera. In our fields, 65 RR Lyrae stars cataloged by the Optical Gravitational Lensing Experiment (OGLE) Collaboration were identified. Using different theoretical and empirical calibrations of the period-luminosity-metallicity relation, we find consistent LMC distance moduli values. Since the observed fields are situated very close to the center of the LMC, the correction for the tilt of the LMC bar with respect to the line of sight is negligible. Our adopted best true distance modulus to the LMC of 18.58 0.03 (statistical) 0.11 (systematic) mag agrees very well with most independent determinations to this galaxy. © 2008. The American Astronomical Society. All rights reserved..