A panchromatic view of the bulge globular cluster NGC 6569

Abstract

We used high-resolution optical HST/WFC3 and multi-conjugate adaptive optics assisted GEMINI GeMS/GSAOI observations in the near-infrared to investigate the physical properties of the globular cluster NGC 6569 in the Galactic bulge. We have obtained the deepest purely NIR color-magnitude diagram published so far for this cluster using ground-based observations, reaching $K_s$ $\approx$ 21.0 mag (two magnitudes below the main-sequence turn-off point). By combining the two datasets secured at two different epochs, we determined relative proper motions for a large sample of individual stars in the center of NGC 6569, allowing a robust selection of cluster member stars. Our proper motion analysis solidly demonstrates that, despite its relatively high metal content, NGC 6569 hosts some blue horizontal branch stars. A differential reddening map has been derived in the direction of the system, revealing a maximum color excess variation of about $\delta E(B-V)$ $\sim$ 0.12 mag in the available field of view. The absolute age of NGC 6569 has been determined for the first time. In agreement with the other few bulge globular clusters with available age estimates, NGC 6569 turns out to be old, with an age of about 12.8 Gyr, and a typical uncertainty of 0.8-1.0 Gyr.

25 pages, 16 Figures, 1 Table. Accepted for publication in ApJ

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Cited by in corpus (23)

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• Digging for relics of the past: the ancient and obscured bulge globular cluster NGC6256
• First evidence of multi-iron sub-populations in the Bulge Fossil Fragment candidate Liller 1
• A new identity card for the bulge globular cluster NGC 6440 from resolved star counts
• Digging into the Galactic Bulge: stellar population and structure of the poorly studied cluster NGC 6316
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• Modeling the chemical enrichment history of the Bulge Fossil Fragment Terzan 5
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• The Bulge Cluster Origin (BulCO) survey at the ESO-VLT: probing the early history of the Milky Way assembling. Design and first results in Liller1
• A Photometric in-depth look at the core-collapsed globular cluster NGC 6284
• On the manifest link between Terzan 5 and the Galactic bulge
• Spectroscopic analysis of the bulge Globular Cluster ESO~456-SC38
• Infrared photometry and CaT spectroscopy of globular cluster M 28 (NGC 6626)
• CAPOS: The bulge Cluster APOGEE Survey VI. Characterizing multiple stellar populations and chemical abundances in the bulge globular cluster NGC 6569
• The bulge globular cluster Terzan 6 as seen from multi-conjugate adaptive optics and HST
• Bulge Fossil Fragments as a new population of factories of gravitational wave sources in the Galaxy
• The variable stars in the field of NGC 6139: A critical approach to their reddening and membership