1997/08/27 by Eugenio Carretta, E. Carretta, Angela Bragaglia +3
Computer Science · Economics, Econometrics and Finance · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Geochemistry and Geochronology of Asian Mineral Deposits #Geochemistry and Geologic Mapping #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9708249
8 pages, using Latex2e and documentclass aa.cls, plus 4 .ps encapsulated figures, accepted by Astronomy & Astrophysics. Text and figures also available at http://www.bo.astro.it/bap/BAPhome.html or via anonymous ftp at ftp://boas3.bo.astro.it/bap/files (bap97-23-text.ps)
arxiv created 1997/08/27 · openalex publication_date 1997/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present an improved calibration of photometric metallicity indicators,\nderived from the new metallicity scale for Globular Clusters presented by\nCarretta & Gratton (1997) and based on direct high resolution spectroscopy of\n160 stars in 24 globular clusters. We have carefully recalibrated the\ntraditional abundance indices based upon the red giant branch (RGB) morphology,\nboth in the V,B-V and V,V-I planes, namely the dereddened colour at the\nluminosity level of the horizontal branch (HB), and the magnitude difference\nbetween the HB and the RBG at a given dereddened colour. Finally, we give new\naccurate relations to employ in the Simultaneous Metallicity Reddening method\nby Sarajedini (1994), also tied to the Carretta & Gratton (1997) abundance\nscale.\n