JHKs photometry of 4 Bulge globular clusters : J/MNRAS/361/272


Authors : Valenti E. orcid , Origlia L., Ferraro (hide) , Origlia L., Ferraro et..al

Bibcode : 2005MNRAS.361..272V (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Clusters, globular; Photometry, infrared
UAT : Globular star clusters, Infrared photometry

Observation (OC)

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Inserted into VizieR : 25-Jul-2005
Last modification : 01-Jul-2024

Near-Infrared photometry of four metal-rich Bulge globular clusters NGC 6304, NGC 6569, NGC 6637, NGC 6638. (2005)

Keywords : techniques photometric - infrared: stars - globular clusters: individual (NGC 6304, NGC 6569, NGC 6637, NGC 6638)

Abstract:We present high-quality near-infrared photometry of four bulge metal-rich globular clusters, namely: NGC 6304, NGC 6569, NGC 6637 and NGC 6638. By using the observed Colour-Magnitude Diagrams we derived a photometric estimates of the cluster reddening and distance. We performed a detailed analysis of the Red Giant Branch, presenting a complete description of morphologic parameters and evolutionary features (Bump and Tip). Photometric estimates of the cluster metallicity have been obtained by using the updated set of relations (published by our group) linking the metal abundance to a variety of near-Infrared indices measured along the Red Giant Branch. The detection of the Red Giant Branch Bump and the Tip is also presented ...(more)
Abstract: (hide)
The IR catalogs of the observed clusters are based on ground-based observations using the near-IR camera SOFI@ESO/NTT equipped with a 1024x1024 Hawaii HgCdTe array detector. By using two different magnifications: 0.146"/pix and 0.288"/pix a total FoV of 4.9'x4.9' has been covered. The instrumental magnitudes have been calibrated into the 2MASS photometric system and astrometrically corrected by using 2MASS catalogs (<II/246>), with an accuracy of <0.2".
Elena Valenti, elena.valenti3(at)unibo.it

                
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