Browsing by Author "Bica, E"

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    The metal content of the bulge globular cluster NGC 6528
    (2004) Zoccali, A; Barbuy, B; Hill, V; Ortolani, S; Renzini, A; Bica, E; Momany, Y; Pasquini, L; Minniti, D; Rich, RM
    High resolution spectra of five stars in the bulge globular cluster NGC 6528 were obtained at the 8m VLT UT2-Kueyen telescope with the UVES spectrograph. Out of the five stars, two of them showed evidence of binarity. The target stars belong to the horizontal and red giant branch stages, at 4000 < T-eff < 4800 K. Multiband V, I, J, H, K-s, photometry was used to derive initial effective temperatures and gravities. The main purpose of this study is the determination of metallicity and elemental ratios for this template bulge cluster, as a basis for the fundamental calibration of metal-rich populations. The present analysis provides a metallicity [Fe/H] = -0.1 +/- 0.2 and the alpha-elements O, Mg and Si, show [alpha/Fe] approximate to+0.1, whereas Ca and Ti are around the solar value or below, resulting in an overall metallicity Z approximate to Z(.).
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    VLT-UVES analysis of two giants in the bulge metal-poor globular cluster HP-1 - Analysis of two giants in HP-1
    (2006) Barbuy, B; Zoccali, M; Ortolani, S; Momany, Y; Minniti, D; Hill, V; Renzini, A; Rich, RM; Bica, E; Pasquini, L; Yadav, RKS
    Context. Metal-poor globular clusters in the bulge are important tracers of early chemical evolution. HP-1 is among the six metal-poor clusters within 5. of the Galactic center, and could be the one closest to the center