SIMBAD references

1998A&A...329..937C - Astronomy and Astrophysics, volume 329, 937-942 (1998/1-3)

On the calibration of Red Giant Branch metallicity indicators in globular clusters: new relations based on an improved abundance scale.

CARRETTA E. and BRAGAGLIA A.

Abstract (from CDS):

We present an improved calibration of photometric metallicity indicators, derived from the new metallicity scale for Globular Clusters presented by Carretta & Gratton (1997A&AS..121...95C) 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 (1994AJ....107..618S), also tied to the Carretta & Gratton (1997A&AS..121...95C) abundance scale.

Abstract Copyright:

Journal keyword(s): stars: abundances - globular clusters: general

CDS comments: Table 1 : ESO 121 = ESO 121-3

Simbad objects: 19

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