Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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NEAR-IR PHOTOMETRIC PROPERTIES OF HB, MSTO, AND SGB FOR METAL POOR GALACTIC GLOBULAR CLUSTERS

  • Kim, J.W. (Dept. of Astronomy, Institute of Earth Atmosphere Astronomy, Yonsei University) ;
  • Kang, A. (Dept. of Astronomy, Institute of Earth Atmosphere Astronomy, Yonsei University) ;
  • Shin, I.G. (Dept. of Astronomy, Institute of Earth Atmosphere Astronomy, Yonsei University) ;
  • Chun, S.H. (Dept. of Astronomy, Institute of Earth Atmosphere Astronomy, Yonsei University) ;
  • Sohn, Y.J. (Dept. of Astronomy, Institute of Earth Atmosphere Astronomy, Yonsei University)
  • Published : 2007.03.10
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Abstract

We report photometric features of the HB, MSTO, and SGB for a set of metal-poor Galactic globular clusters on the near-IR CMDs. The magnitude and color of the MSTO and SGB are measured on the fiducial normal points of the CMDs by applying a polynomial fit. The near-IR luminosity functions of horizontal branch stars in the classical second parameter pair M3 and M13 indicate that HB stars in M13 are dominated by hot stars that are rotatively faint in the infrared, whereas HB stars in M3 are brighter than those in M13. The luminosity functions of HB stars in the observed bulge clusters, except for NGC 6717, show a trend that the fainter hot HB stars are dominated in the relatively metal-poor clusters while the relatively metal-rich clusters contain the brighter HB stars. It is suggestive that NGC 6717 would be an extreme example of the second-parameter phenomenon for the bulge globular clusters.

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