Near-Infrared Properties of Metal-poor Globular Clusters in the Galactic Bulge Direction

Abstract

Aims. J, H, and K' images obtained from the near-infrared imager CFHTIR on the Canada-France-Hawaii Telescope are used to derive the morphological parameters of the red giant branch (RGB) in the near-infrared color-magnitude diagrams for 12 metal-poor globular clusters in the Galactic bulge direction. Using the compiled data set of the RGB parameters for the observed 12 clusters, in addition to the previously studied 5 clusters, we discuss the properties of the RGB morphology for the clusters and compare them with the calibration relations for the metal-rich bulge clusters and the metal-poor halo clusters. Methods. The photometric RGB shape indices such as colors at fixed magnitudes of MK = MH = (-5.5, -5, -4, and -3), magnitudes at fixed colors of (J - K)o = (J - H)o = 0.7, and the RGB slope are measured from the fiducial normal points defined in the near- infrared color-magnitude diagrams for each cluster. The magnitudes of RGB bump and tip are also estimated from the differential and cumulative luminosity functions of the selected RGB stars. The derived RGB parameters have been used to examine the overall behaviors of the RGB morphology as a function of cluster metallicity. Results. The correlations between the near-infrared photometric RGB shape indices and the cluster metallicity for the programme clusters compare favorably with the previous observational calibration relations for metal-rich clusters in the Galactic bulge and the metal-poor halo clusters. The observed near-infrared magnitudes of the RGB bump and tip for the investigated clusters are also in accordance with the previous calibration relations for the Galactic bulge clusters.

arXiv comment12 pages, 9 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (33)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Color Transformations for the 2MASS Second Incremental Data Release
• Abundances for Globular Cluster Giants: I. Homogeneous Metallicities for 24 Clusters
• Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR Stellar Photometry
• A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?
• The YY Isochrones for alpha-element Enhanced Mixtures
• The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features
• The Y^2 Stellar Evolutionary Tracks
• HST color-magnitude diagrams of 74 galactic globular clusters in the HST F439W and F555W bands
• Red Giant Branch stars: the theoretical framework
• A new IR-Array photometric survey of Galactic Globular Clusters: A detailed study of the RGB sequence as a step towards the global testing of stellar models
• Near-IR properties of 24 Globular Clusters in the Galactic Bulge
• The calibration of the RGB Tip as a Standard Candle: Extension to Near Infrared colors and higher metallicity
• Evidence for the Hierarchical Formation of the Galactic Spheroid
• The Red Giant Branch in the Near-Infrared Colour-Magnitude Diagrams. I: The calibration of photometric indices
• Towards the absolute planes: a new calibration of the Bolometric Corrections and Temperature scales for Population II Giants
• Near Infrared properties of 12 Globular Clusters toward the inner Bulge of the Galaxy
• The Red Giant Branch in Near-Infrared Colour-Magnitude Diagrams. II: The luminosity of the Bump and the Tip
• On the UV Bright Phase of Metal-Rich Horizontal-Branch Stars
• Space Velocities of Southern Globular Clusters. IV. First Results for Inner-Galaxy Clusters
• Near-IR observations of NGC 6822: AGB stars, distance, metallicity and structure
• 3-D Simulations of the Chemical and Dynamical Evolution of the Galactic Bulge
• Red Giant Branch Stars as Probes of Stellar Populations I: 2MASS Calibration and Application to 2MASS GC01
• Discovery of a New Low-Latitude Milky Way Globular Cluster using GLIMPSE
• Whiting 1: a new Halo Young Globular Cluster
• Near-Infrared photometry of four metal-rich Bulge globular clusters: NGC6304, NGC6569, NGC6637, NGC6638
• Near-Infrared photometry and spectroscopy of NGC 6539 and UKS 1: two intermediate metallicity Bulge Globular Clusters
• Structural parameters of 11 faint Galactic globular clusters derived with 2MASS
• Distances to Local Group Galaxies
• Infrared Spectroscopic Study of 8 Galactic Globular Clusters
• TNG Near-IR Photometry of five Galactic Globular Clusters
• FSR1735 -- A new globular cluster candidate in the inner Galaxy
• The Relation between Near-Infrared Luminosity of RGB Bumps and Metallicity of Galactic Globular Clusters

Cited by in corpus (6)

• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• Uncloaking globular clusters in the inner Galaxy
• Mapping the Milky Way bulge at high resolution: the 3D dust extinction, CO, and X factor maps
• Resolved Near-Infrared Stellar Populations in Nearby Galaxies
• Near-Infrared Photometry of Globular Clusters Towards the Galactic Bulge: Observations and Photometric Metallicity Indicators
• High-resolution abundance analysis of four red giants in the globular cluster NGC 6558