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Browsing by Author "Bhattacharyya, J. C"

Browsing by Author "Bhattacharyya, J. C"

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  • Observations of Optical Emission from X-Per and SCO X-1 
    Sharma, P. D; Nagaraja, V. B; Marar, K. T. M; Bhattacharyya, J. C; Mohin, S (IUPAP, 1981)
    High speed photometric observations of X-per, and SCO X-1 have been carried out during 1979-80 with the 102cm and 33cm telescope at the Kavalur observatory. Results from some of these observations are presented in this ...
  • Observations of X-Per in optical domain 
    Sharma, D. P; Nagaraja, B. V; Bhattacharyya, J. C; Mohin, S; Raveendran, A. V (Kluwer Academic Publishers, 1983-09)
    We have monitored the X-ray source X-Per (4U 0352+30) on 31 August, 1979 through aU filter for about 1.5 hr using 102-cm telescope of Kavalur observatory. During this period intensity of X-Per fluctuated for some time, on ...
  • Observing conditions for optical astronomy at Leh 
    Singh, J; Bhattacharyya, J. C; Babu, G. S. D; Ashoka, B. N; Appakutty, M; Rangarajan, K. E; Kutty, K. N; Moorthy, V; Selvakumar, G; Michael, P; Muniyandi, A; Gabriel, F (Astronomical Society of India, 1989-09)
    The sky and atmospheric conditions at Leh have been monitored since 1984 with a view to determining its suitability as a site for a high-altitude observatory. During May-November, 1987, relative humidity and other parameters ...
  • Occultation: A precise method in astronomical studies 
    Bhattacharyya, J. C (Indian Academy of Sciences, 1982-05-09)
  • On emission lines of hydrogen, helium and ionized calcium seen on a coronal spectrogram of the march 7, 1970 eclipse 
    Bappu, M. K. V; Bhattacharyya, J. C; Sivaraman, K. R (D. Reidel Publishing, 1972-10)
    Emission lines of the Balmer series, D3 and H and K are reported present on a coronal spectrogram obtained at the March 7, 1970 eclipse. Arguments are presented to show that these could not have originated from scattering ...
  • Optical telescopes in India 
    Bhattacharyya, J. C (National Institute of Science Communication and Information Resources, 1989-08)
    Fabrication and use of optical telescopes for astronomical observations in India have been reviewed. Evolution of telescopes, their optics, mounting and drive system leading to large aperture instruments of today has been ...
  • Outer rings of Saturn 
    Bhattacharyya, J. C; Vasundhara, R (Indian Academy of Sciences, 1985)
    A two component model of a possible ring structure at about 12.5 Saturn radii is presented here which can explain the shapes of the immersion and emersion occultation profiles obtained during the occultation of SAO 158913 ...
  • A personal-computer-based imaging Stokes polarimeter for solar observations 
    Ananth, A. V; Venkatakrishnan, P; Narayanan, R. S; Bhattacharyya, J. C (Springer, 1994-05)
    For measurements of vector magnetic field over solar active regions, a Stokes polarimeter for studying the polarization profiles on selected spectral lines is described. This paper gives details of the relevant charged ...
  • Photoelectric light curve of YY Eridani 
    Bhattacharyya, J. C (Kodaikanal Observatory, 1966-12)
    Photoelectric light curves in B and V of the W Ursa majoris star YY Eridani have been determined. Gradual lengthening of the period has been observed
  • Photometric Observations of the X-Ray Dwarf Nova HL Canis Majoris 
    Seetha, S; Marar, T. M. K; Sharma, D. P; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (INSDOC, 1983-08)
    High speed optical photometric observations of the X-ray dwarf nova HL Canis Majoris (1E 0643-1648), discovered with the Einstein Observatory, are presented. Results of long term monitoring and attempts to detect photometric ...
  • Photometry of intermediate polars AO PSC and V 1223 SGR 
    Padmini, V. N; Marar, T. M. K; Seetha, S; Padmanabhan, P; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Kuppuswamy, K; Rozario, M. J (Springer, 1985-12)
    We present optical photometric observations of the cataclysmic variables AO Psc and V 1223 Sgr, both of which are believed to contain slowly-rotating white-dwarf pulsars. These objectes belong to the new class of intermediate ...
  • Photometry of the solar corona of March 7, 1970 
    Bappu, M. K. V; Bhattacharyya, J. C; Sivaraman, K. R (Indian Academy of Sciences, 1973)
    Isophotes obtained by equidensitometry techniques from four exposures of the March 7, 1970 corona are used for derivation of intensity distributions along the equator, poles, streamers and dark ' gaps ' in the visible ...
  • Plume-like structures of extinction clouds at 19 Saturn radii 
    Vasundhara, R; Bhattacharyya, J. C; Rozario, M (Astronomical Society of India, 1986-12)
    Observations of the occultation of the star SAO 158763 by Saturn's magnetospheric region around 19 Saturn radii on May 12, 1984 are compared with the observations by Mahra et al. (1985) of the same event. Certain disparities ...
  • Possible Detection of a Ring System in Saturn's Magnetosphere 
    Vasundhara, R; Bhattacharyya, J. C; Santhanam, P; Pande, A. K; Mohan, V; Mahra, H (Nature Publishing Group, 1984-12)
    The region of the magnetosphere of Saturn around 14 radii and 19 radii has been of special interest since the detection of anomalous dips in the low-energy plasma ion-density in these regions by the Voyager 1, Voyager 2 ...
  • Project Kalki - a Sky Survey with 45-CM Schmidt Telescope - I 
    Rajamohan, R; Bhattacharyya, J. C; Kuppuswamy, K; Paranjpye, A (Astronomical Society of Indian, 1987-12)
    A brief description of the sky survey project taken up with the 45 cm Schmidt telescope of the Vainu Bappu Observatory at Kavalur is given. Positions of 11 asteroids detected on plates taken during 1987 Feburary-March are reported
  • Project Kalki - A sky survey with the Schmidt telescope. 2 
    Rajamohan, R; Shankar, P. N; Bhattacharyya, J. C; Kuppuswamy, K; Paranjpye, A (Astronomical Society of Indian, 1988-03)
    The region of the sky photographed with the 45cm Schmidt telescope during 1987 March-May and the position of the asteroids detected on these plates are reported in this paper. Out of the 29 asteroids observed four have ...
  • Proposed high altitude observing facility 
    Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1987-09)
  • Quantitative astronomical spectroscopy in the post Saha equation period 
    Bhattacharyya, J. C (Saha Institute of Nuclear Physics, 2017-07)
    Several new questions of quantitatively estimating physical conditions on astronomical bodies had opened up after formulation of Saha Ionization Equation. The article first reviews the step by step progress in ...
  • The rings of Uranus: story of its discovery 
    Bhattacharyya, J. C (Indian Astronomical Society, 1980)
  • The road to Kavalur 
    Bhattacharyya, J. C (Nehru Centre, 1985-08)

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