Red Giant Branch of the Metal Poor Globular Clusters: I. Bump, Tip, and Distance from Near Infrared Photometry

Details Red Giant Branch of the Metal Poor Globular Clusters: I. Bump, Tip, and Distance from Near Infrared Photometry Red Giant Branch of the Metal Poor Globular Clusters: I. Bump, Tip, and Distance from Near Infrared Photometry

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jass...23...91s&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 23, no. 2, 91-96

Astronomy and Astrophysics

Astronomy

Rgb Bump, Rgb Tip, Distance, Globular Clusters, Near-Infrared Photometry

Scientific paper

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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