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, Yong Cheol Kim, D. G. Kim, C. Chung, S. I. Han, M. S. Chun, Young-Jong Sohn

Research output: Contribution to journalArticle

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 1

Fingerprint

galactic bulge
galactic halos
globular clusters
photometry
metal
near infrared
metals
halos
color
color-magnitude diagram
metallicity
diagram
luminosity
slopes
stars
prediction
parameter
predictions

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kim, J. W. ; Kang, A. ; Rhee, J. ; Kim, H. I. ; Kim, Yong Cheol ; Kim, D. G. ; Chung, C. ; Han, S. I. ; Chun, M. S. ; Sohn, Young-Jong. / Deep near-IR photometry of eight metal-poor globular clusters in the Galactic bulge and halo. In: Astronomy and Astrophysics. 2006 ; Vol. 459, No. 2. pp. 499-509.
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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.",
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Deep near-IR photometry of eight metal-poor globular clusters in the Galactic bulge and halo. / Kim, J. W.; Kang, A.; Rhee, J.; Kim, H. I.; Kim, Yong Cheol; Kim, D. G.; Chung, C.; Han, S. I.; Chun, M. S.; Sohn, Young-Jong.

In: Astronomy and Astrophysics, Vol. 459, No. 2, 01.11.2006, p. 499-509.

Research output: Contribution to journalArticle

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AU - Kang, A.

AU - Rhee, J.

AU - Kim, H. I.

AU - Kim, Yong Cheol

AU - Kim, D. G.

AU - Chung, C.

AU - Han, S. I.

AU - Chun, M. S.

AU - Sohn, Young-Jong

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N2 - 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.

AB - 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.

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