Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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RED GIANT BRANCH OF THE METAL POOR GLOBULAR CLUSTERS: I. BUMP, TIP, AND DISTANCE FROM NEAR INERARED PHOTOMETRY

  • Sohn Y.J. (Department of Astronomy, Yonsei University) ;
  • Kim J.W. (Department of Astronomy, Yonsei University) ;
  • Kang A. (Department of Astronomy, Yonsei University)
  • Published : 2006.06.01
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Abstract

We use near-infrared observations of eight selected Galactic globular clusters to estimate their distances by comparing the observed and theoretically predicted K magnitudes of the red giant branch bumps and tips. The K magnitude levels of the RGB bump and tip have been measured from the luminosity function of the selected RGB stars in the clusters. Theoretical absolute $M_k$ magnitudes of the RGB bump and tip are taken from the Yonsei-Yale isochrones. Comparing the observed apparent K magnitude with the derived absolute $M_k$ magnitude, we calculate the distance moduli of the clusters. We discuss the dependency of the derived distance modulus on the cluster age and the uncertainty of the distance measurement from the near-infrared photometry of the RGB bump and tip.

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References

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