Deep near-IR photometry of eight metal-poor globular clusters in the Galactic bulge and halo

J. W. Kim, A. Kang, J. Rhee, H. I. Kim, Y. C. Kim, D. G. Kim, C. Chung, S. I. Han, M. S. Chun, Y. J. Sohn

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7 Citations (Scopus)

Abstract

High quality J, H and K′ images are used to investigate the morphological properties of the near-infrared color-magnitude diagrams for five metal-poor bulge globular clusters and three halo clusters. Photometric parameters to describe the RGB shape, i.e., the colors at fixed magnitudes of MK = MH = (-5.5, -5, -4 and -3), the magnitudes at fixed colors of (J - K)o = (J - H)o = 0.70, and the RGB slope, have been measured from the fiducial normal points of the CMDs. We also measured the near-infrared magnitudes of the RGB bump and tip on the luminosity function of the RGB stars for each cluster. The RGB parameters of the observed metal-poor bulge and halo clusters are consistent with the previous empirical relationships between the RGB parameters and the cluster metallicity for metal-rich bulge clusters and halo clusters. The near-infrared magnitudes of the RGB bump and tip are in good agreement with the theoretical prediction of the Yonsei-Yale isochrone.

Original languageEnglish
Pages (from-to)499-509
Number of pages11
JournalAstronomy and Astrophysics
Volume459
Issue number2
DOIs
Publication statusPublished - 2006 Nov

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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