• P. N. Bhat

      Articles written in Journal of Astrophysics and Astronomy

    • Search for 12.6 millisecond periodicity in TeV gamma rays from Cygnus X-3

      P. N. Bhat P. V. Ramana Murthy P. R. Vishwanath

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      Cygnus X-3, an X-ray binary with an orbital period 4.8 hr was seen to be emitting γ-rays with the same period at TeV energies by several groups. In addition the Durham group (Chadwicket al. 1985) published their observations on the existence of a pulsar in the Cyg X-3 system, emitting TeV γ-rays with a periodicity of approximately 12.6 ms. We observed this object during 1986 October-November and did not detect any pulsed emission of TeV γ-rays in the range of periods from 12.5850 to 12.5967 ms.

    • VRI photometry of M67 for CCD standardization at 2.3m VBT

      P. N. Bhat K. P. Singh T. P. Prabhu A. K. Kembhavi

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      We present the results from CCD photometry in theV, R andI bands, of the ‘Dipper Asterism’ region of the open cluster M67 based on observations carried out at the prime focus of the 2.3 m Vainu Bappu Telescope of the Vainu Bappu Observatory, Kavalur. The CCD parameters like the system gain and the readout noise are measured using several flatfield frames taken through the standardI filter. The CCD chip is calibrated using the photometric standards in the field and linear colour transformation relations are derived. Also a few newVRI photometric measurements are reported for the members of the cluster.

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