Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지

THE VI CCD PHOTOMETRY OF THE GLOBULAR CLUSTER M22

  • CHO DONG HWAN (Department of Astronomy, Seoul National University) ;
  • LEE SEE-WOO (Department of Astronomy, Seoul National University) ;
  • SUNG HWANKYUNG (Research Institute for Basic Sciences, Seoul National University)
  • Published : 1998.04.01
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Abstract

The VI CCD photometry is made for stars in the globular cluster M22 down to $V\approx19^m,\;I\approx18^m$. In the color-magnitude diagram (CMD), red giant branch (RGB), asymtotic giant branch (AGB) and blue horizontal branch (BHB) are well defined. The luminosity functions (LF) of RGB, AGB and BHB stars are derived, discussing deficient gaps and bumps in the CMD. The anomalously wide RGB seen in the BV photometric system is found to disappear in the VI photometric system.

Keywords

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