• J. S. Nathan

      Articles written in Journal of Astrophysics and Astronomy

    • CCD photometry inVRI bands of the galactic cluster NGC 2818

      R. Surendiranath N. Kameswara Rao Ram Sagar J. S. Nathan K. K. Ghosh

      More Details Abstract Fulltext PDF

      The open cluster NGC 2818 containing a planetary nebula has been observed inVRI bands using the CCD system at prime focus of the 2.3-metre Vainu Bappu Telescope. The study extending to starsV ∼ 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

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