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    • Photometric calibration of the CCD camera of 1-m telescope at VBO

      Y. D. Mayya

      Volume 12 Issue 4 December 1991 pp 319-331

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/012/04/0319-0331

    • Keywords

       

      CCD photometry; BVRHα photometry; atmospheric extinction; photometric calibration; open clusters; M67 (NGC 2682)

    • Abstract

       

      Calibration of the CCD camera of the 1m telescope at the Vainu Bappu Observatory, Kavalur, to theB V R system is reported here based on the observations of stars in the ‘dipper asterism’ in the open cluster M 67 (NGC 2682). Transformations involvingB andV have negligible colour terms, while those involvingR are slightly colour dependent. The possibility of using scaled-downR band fluxes to estimate the continuum flux at Hα is investigated by comparing the counts inR band with those through an interference filter centred at Hα. The scaling factor is found to remain constant over a wide range of colours. The sensitivity of the telescope-filter-CCD combination is estimated to be 2.0 per cent, 8.3 per cent and 9.7 per cent inB, V andR bands, respectively. The star F117 appears to be a small-amplitude (∼ 0.05 mag) variable.

    • Author Affiliations

       

      Y. D. Mayya1 2

      1. Indian Institute of Astrophysics, Bangalore - 560034
      2. Astronomy Programme, Department of Physics, Indian Institute of Science, Bangalore - 560 012

    • Dates

       
      Published
      December 1991
      Manuscript received
      7 July 1991
      Accepted
      10 October 1991

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