Publications of The Korean Astronomical Society (천문학논총)

The Korean Astronomical Society (한국천문학회)
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UBVI CCD PHOTOMETRY OF THE OPEN CLUSTER NGC 2420

산개성단 NGC 2420에 대한 UBVI CCD 측광

  • LEE SANG HYUN (Department of Earth Sciences, Pusan National University) ;
  • KANG YONG-WOO (Department of Earth Sciences, Pusan National University) ;
  • ANN HONG BAE (Department of Earth Sciences, Pusan National University)
  • Published : 1999.12.01
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Abstract

We present a new UBVI CCD photometry of the intermediate-age open cluster NGC 2420. Our photometry covers a field of $7'9\times7.'7$ of the sky centered on the cluster. We determined the reddening and distance to the cluster by the main sequence fitting as $E(B - V) = 0.05\pm0.02$ and $(m-M)_o = 11.9\pm0.1$, along with the age of $\~2$ Gyr by fitting the Padova isochrones to the observed color-magnitude diagrams of the cluster. The fraction of binaries is found to be $44\pm5\%$ and they are likely to locate in the central region of the cluster. The spatial distributions of the binaries and the variation of the cluster luminosity functions along the radius suggest mass segregations due to the dynamical evolution of the cluster.

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