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    • Keywords


      Galaxy: globular; clusters: individual: NGC 1851; stars: blue stragglers; stars: Hertzsprung–Russell and colour-magnitude diagrams.

    • Abstract


      We present the study of dynamical status of the globular cluster NGC 1851. A combination of multi-wavelength space and ground-based data sets are used for the present analysis. In order to select the genuine cluster members, we used the astro-photometric data available from HST and GAIA-DR2 catalogs. The BSS radial distribution of the cluster is plotted from the center of the cluster to the outskirts. The radial distribution of BSS shows a central peak, followed by a dip at the intermediate radii ($r_{\rm min}\sim 90''$) and a rising trend in the outskirts. We also estimated $A^+_{rh}$ parameter as $0.391 \pm 0.006$ to validate the findings of the radial distribution study. On the basis of the minima in the BSS radial distribution and the value of $A^+_{rh}$ parameter, we conclude that NGC 1851 belongs to Family II classification and is an intermediate dynamical statecluster.

    • Author Affiliations



      1. Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 001, India.
      2. Department of Physics and Astrophysics, University of Delhi, Delhi 110 007, India.
      3. Indian Institute of Astrophysics, Koramangala II Block, Bangalore 560 034, India.
    • Dates

  • Journal of Astrophysics and Astronomy | News

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      Posted on January 27, 2016

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