Infrared photometry and CaT spectroscopy of globular cluster M 28 (NGC 6626)

Recent studies show that the inner Galactic regions host genuine bulge globular clusters, but also halo intruders, complex remnants of primordial building blocks, and objects likely accreted during major merging events. In this study we focus on the properties of M 28, a very old and massive cluster...

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Bibliographic Details
Published in:arXiv.org 2021-03
Main Authors: C Moni Bidin, Mauro, F, R Contreras Ramos, Zoccali, M, Reinarz, Y, Moyano, M, Gonzalez-Diaz, D, Villanova, S, Carraro, G, Borissova, J, A -N Chene, Cohen, R E, Geisler, D, Kurtev, R, Minniti, D
Format: Article
Language:English
Subjects:
Galactic bulge
Globular clusters
Infrared analysis
Infrared photometry
Inhomogeneity
Metallicity
Photometry
Spectrum analysis
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Summary:Recent studies show that the inner Galactic regions host genuine bulge globular clusters, but also halo intruders, complex remnants of primordial building blocks, and objects likely accreted during major merging events. In this study we focus on the properties of M 28, a very old and massive cluster currently located in the Galactic bulge. We analysed wide-field infrared photometry collected by the VVV survey, VVV proper motions, and intermediate-resolution spectra in the calcium triplet range for 113 targets in the cluster area. Our results in general confirm previous estimates of the cluster properties available in the literature. We find no evidence of differences in metallicity between cluster stars, setting an upper limit of Delta[Fe/H]
ISSN:2331-8422
DOI:10.48550/arxiv.2103.14806