2008/04/21 by Olaf Szewczyk, G. Pietrzyński, Grzegorz Pietrzynski +14 · 1 citation
Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Distance modulus #Galaxy #Globular cluster #Gravitational lens #Large Magellanic Cloud #Metallicity #Photometry (optics) #Physics #RR Lyrae variable #Red clump #Redshift #Stars #Stellar, planetary, and galactic studies #Variable star #astro-ph
paper · pdf · doi:10.1088/0004-6256/136/1/272
30 pages, including 5 figures and 8 tables. AJ submitted and accepted
arxiv created 2008/04/21 · openalex publication_date 2008/06/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.