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V, J, H and K Imaging of the Metal Rich Globular Cluster NGC 6528 by Momany, Y.; Ortolani, S.; Held, E. V.; Barbuy, B.; Bica, E.; Renzini, A.; Bedin, L. R.; Rich, R. M.; Marconi, G. is a scholarly article available to read on EtoBox.

What is V, J, H and K Imaging of the Metal Rich Globular Cluster NGC 6528 about?

New near-infrared observations of NGC6528 are presented. The JHK observations complement a previous HST/NICMOS data set by Ortolani et al. (2001), in that they sample a larger area, contain a more numerous sample of red giant stars, and include the K band. Also, archival HST data sets (separated by 6.093 years) were used to proper-motion decontaminate the near-infrared sample and extract a clean VJHK catalogue. Using the present wide colour baseline, we compared the cleaned colour-magnitude diagrams of NGC6528 with those of NGC 6553 and NGC104 and derived new estimates of reddening and distance, E(B-V)=0.55 and (m-M)o=14.44 (7.7 kpc). Moreover, the morphology and location of the cleaned red giant branch were used to derive a photometric estimate of the cluster metallicity. The average of 10 metallicity indicators yields a mean value of [M/H] ~ 0.0, and [Fe/H] ~-0.20 and +0.08 on the Zinn & West (1984) and Carretta & Gratton (1997) revised metallicity scale, respectively. The best isochrone fit to the cleaned K,V-K diagram is obtained for a 12.6 Gyr and Z=0.02 isochrone, i.e. the derived metallicity of NGC6528 turns out to be very close to the mean of stars in the Baade's Window. Fi

Author

Momany, Y.; Ortolani, S.; Held, E. V.; Barbuy, B.; Bica, E.; Renzini, A.; Bedin, L. R.; Rich, R. M.; Marconi, G.

Published

2003

Language

EN