CCD PHOTOMETRY IN VRI BANDS OF THE GALACTIC CLUSTER NGC-2818

The open cluster NGC 2818 containing a planetary nebula has been observed in VRI bands using the CCD system at prime focus of the 2.3-metre Vainu Bappu Telescope. The study extending to stars V ∼ 21 magnitude establishes the distance modulus as (m-M) 0 = 12.9 ±0.1 for the cluster. Based on the fitting of theoretical isochrones computed for solar metallicity, an age of 5(±1) × 108 years has been assigned to the cluster. Association of the planetary nebula with the cluster indicates that the progenitor mass of the planetary nebula on the main sequence is ≥2.5M⊙ © 1990 Indian Academy of Sciences.