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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/035/02/0143-0156

    • Keywords

       

      Hertzsprung; Russell (H–R) diagram; dust extinction; open clusters and associations: individual: SAI 63; open clusters and associations: individual: SAI 75.

    • Abstract

       

      We present 𝑈𝐵𝑉𝐼 CCD photometric observations obtained in the field of open clusters SAI 63 and SAI 75. CCD optical data obtained for the first time for these clusters are used to derive the fundamental parameters of the clusters. Stellar surface density profile indicates that radii of SAI 63 and SAI 75 are ∼ 3'.5 and 2'.5 respectively. The reddenings 𝐸(𝐵 - 𝑉) are 0.44 ± 0.05 and 0.34 ± 0.05 mag for SAI 63 and SAI 75 respectively while the corresponding distances are 2.2 ± 0.2 and 3.5 ± 0.3 kpc. An age of 450 ± 50 Myr for SAI 63 and 90 ± 10 Myr for SAI 75 is determined using the theoretical isochrones of Z = 0.019. Our analysis shows that reddening law is normal towards SAI 75.

    • Author Affiliations

       

      R. K. S. Yadav1 S. I. Leonova2 R. Sagar1 E. V. Glushkova2

      1. Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 129, India.
      2. Sternberg Astronomical Institute, Moscow Lomonosov State University, Universitetsky pr. 13, Moscow 119992, Russia.
    • Dates

       
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