2004/03/23 by E. Valenti, F. R. Ferraro, L. Origlia · 6 citations
Physics and Astronomy · #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2004.07861.x
published as Mon.Not.Roy.Astron.Soc. 351 (2004) 1204 · 13 pages, 11 figures accepted by MNRAS
arxiv created 2004/03/23 · openalex publication_date 2004/07/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present new high-quality near-infrared photometry of 10 Galactic globular clusters spanning a wide metallicity range (−2.12 ≤[Fe/H]≤− 0.49): five clusters belong to the halo (NGC 288, 362, 6752, M15 and M30) and five (NGC 6342, 6380, 6440, 6441 and 6624) to the bulge. By combining J, H and K observations with optical data, we constructed colour–magnitude diagrams in various planes: (K, J–K), (K, V–K), (H, J–H) and (H, V–H). A set of photometric indices (colours, magnitudes and slopes) describing the location and the morphology of the red giant branch (RGB) have been measured. We have combined this new data set with those collected by our group over the last 5 years, and here we present an updated calibration of the various RGB indices in the Two-Micron All-Sky Survey photometric system, in terms of the cluster metallicity.