The metal content of the bulge globular cluster NGC 6528

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[1] [1,Zocali, M.
[2] Barbuy, B.
[3] Hill, V.
[4] Ortolani, S.
[5] Renzini, A.
[6] Bica, E.
[7] Momany, Y.
[8] Pasquini, L.
[9] Minniti, D.
[10] Rich, R.M.
来源：
Zocali, M. (mazoccali@astro.puc.cl) | 1600年 / EDP Sciences卷 / 423期
关键词：
Astrophysics - Calcium - Data reduction - Galaxies - Imaging techniques - Morphology - Telescopes - Titanium - Ultraviolet spectrographs;
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摘要：
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 eff 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 α-elements O, Mg and Si, show [α/Fe] =+0.1, whereas Ca and Ti are around the solar value or below, resulting in an overall metallicity Z Zo.
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