On the calibration of Red Giant Branch metallicity indicators in Globular Clusters: new relations based on an improved abundance scale

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dc.creatorCarretta, Eugenio
dc.creatorBragaglia, Angela
dc.date1997-08-27
dc.date.accessioned2026-07-07T02:24:05Z
dc.date.available2026-07-07T02:24:05Z
dc.descriptionWe present an improved calibration of photometric metallicity indicators, derived from the new metallicity scale for Globular Clusters presented by Carretta & Gratton (1997) and based on direct high resolution spectroscopy of 160 stars in 24 globular clusters. We have carefully recalibrated the traditional abundance indices based upon the red giant branch (RGB) morphology, both in the V,B-V and V,V-I planes, namely the dereddened colour at the luminosity level of the horizontal branch (HB), and the magnitude difference between the HB and the RBG at a given dereddened colour. Finally, we give new accurate relations to employ in the Simultaneous Metallicity Reddening method by Sarajedini (1994), also tied to the Carretta & Gratton (1997) abundance scale.
dc.description8 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)
dc.identifierhttps://arxiv.org/abs/astro-ph/9708249
dc.identifierhttp://arxiv.org/abs/astro-ph/9708249
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11494
dc.subjectAstrophysics
dc.titleOn the calibration of Red Giant Branch metallicity indicators in Globular Clusters: new relations based on an improved abundance scale
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