The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features

Details The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features

1999-06-15

arxiv.org/abs/astro-ph/9906248v1

Astron.J.118:1738-1758,1999

Astronomy and Astrophysics

Astrophysics

51 pages, 23 figures, AAS Latex, macro rtrpp4.sty included, accepted by AJ

Scientific paper

10.1086/301029

A catalog including a set of the most recent Color Magnitude Diagrams (CMDs) is presented for a sample of 61 Galactic Globular Clusters (GGCs). We used this data-base to perform an homogeneous systematic analysis of the evolved sequences (namely, Red Giant Branch (RGB), Horizontal Branch (HB) and Asymptotic Giant Branch (AGB)). Based on this analysis, we present: (1) a new procedure to measure the level of the ZAHB (V_ZAHB) and an homogeneous set of distance moduli obtained adopting the HB as standard candle; (2) an independent estimate for RGB metallicity indicators and new calibrations of these parameters in terms of both spectroscopic ([Fe/H]_CG97) and global metallicity ([M/H], including also the alpha-elements enhancement). The set of equations presented can be used to simultaneously derive a photometric estimate of the metal abundance and the reddening from the morphology and the location of the RGB in the (V,B-V)-CMD. (3) the location of the RGB-Bump (in 47 GGCs) and the AGB-Bump (in 9 GGCs). The dependence of these features on the metallicity is discussed. We find that by using the latest theoretical models and the new metallicity scales the earlier discrepancy between theory and observations (~0.4 mag) completely disappears.

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