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      https://www.ias.ac.in/article/fulltext/joaa/043/0031

    • Keywords

       

      Star clusters; NGC 1513; NGC 4147; WD 1145$+$017; Sh 2-61; CCD imager.

    • Abstract

       

      The UBVRI CCD photometric data of open star cluster NGC 1513 are obtained with the 3.6-m Indo-Belgian Devasthal optical telescope (DOT). Analyses of the GAIA EDR3 astrometric data have identified 106 possible cluster members. The mean proper motion of the cluster is estimated as $\mu_{\alpha}\cos\delta=1.29\pm 0.02$ and $\mu_{\delta}=-3.74\pm0.02$ mas yr$^{-1}$. Estimated values of reddening $E(B-V)$ and distance to the NGC 1513 are $0.65 \pm 0.03$ mag and $1.33 \pm 0.1$ kpc, respectively. Age of $225 \pm 25$ Myr is assigned to the cluster by comparing theoretical isochrones with deeply observed cluster sequences. Using observations taken with the 3.6-m DOT, values of distance and age of the galactic globular cluster NGC 4147 areestimated as $18.2 \pm 0.2$ Kpc and $14 \pm 2$ Gyr, respectively. The optical observations of planetary transit around white dwarf WD $1145\pm 017$ and $K$-band imaging of star-forming region Sharpless Sh 2-61 demonstrate observing capability of 3.6-m DOT. Optical and near-infrared observations of celestial objects and events are being carried out routinely with the 3.6-m DOT. They indicate that the performance of the telescope is at par with those of other similar telescopes located elsewhere in the world. We, therefore, statethat this observing facility augurs well for multi-wavelength astronomy including the study of astrophysical jets.

    • Author Affiliations

       

      RAM SAGAR1 2 R. K. S. YADAV2 S. B. PANDEY2 SAURABH SHARMA2 SNEH LATA2 SANTOSH JOSHI2

      1. Indian Institute of Astrophysics, Sarajapur Road, Koramangala, Bengaluru 560034, India.
      2. Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263001, India.
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