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Browsing IIAP Publications by Author "Bhattacharyya, J. C"

Browsing IIAP Publications by Author "Bhattacharyya, J. C"

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  • An Analog System for Fast Light Curve Registration 
    Bhattacharyya, J. C; Sundareswaran. A (Indian Institute of Astrophysics, Bangalore, 1977)
    An electronic system for recording fast light curves is described. The system employs a two track magnetic tape recorder for intermediate storage of photometer and time signals and reproduces these on cathode ray oscilloscope ...
  • Astronomy in India in the 20th century. 
    Bhattacharyya, J. C; Vagiswari, A (Indian National Science Academy, 1985)
  • An atmosphere on Ganymede from its occultation of SAO 186800 on 7 June 1972 
    Carlson, R. W; Bhattacharyya, J. C; Smith, B. A; Johnson, T. V; Hidayat, B; Smith, S. A; Taylor, G. E; O'Leary, B; Brinkmann, R. T (The American Association for the Advancement of Science, 1973-09)
    On 7 June 1972 the third Jovian satellite Ganymede occulted the eighth-magnitude star SAO 186800. Successful photoelectric observations obtained at Lembang, Java (Indonesia), and Kavalur, India, show nonabrupt immersions ...
  • Atmospheric Extinction at Kavalur Observatory during 1980-85 
    Shylaja, B. S; Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1986)
    From a series of photoelectric scanner observations during 1980-85, the atmospheric extinction at Kavalur has been analysed. The variation of this appears to follow lamda/sup-4/ law. There is a general increase in the ...
  • Detection of an extremely active state of AM Canum Venaticorum 
    Kutty, K. R. N; Marar, T. M. K; Padmini, V. N; Seetha, S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Mohin, S; Jayakumar, K (D. Reidel Publishing Co., 1986)
    We report fast photometric observations of AM Canum Venaticorum (AM CVn), the ultrashort-period, hydrogen-deficient variable, are reported. An intense flare of (Delta m) peak roughly 0.34 was detected on February 24th, ...
  • Detection of optical pulsations from RX J0558.0+5353 
    Ashoka, B. N; Marar, T. M. K; Seetha, S; Kasturirangan, K; Bhattacharyya, J. C (The European Southern Observatory, 1995-05)
    We report the detection of optical pulsations at a period of 272.785+-0.003s from the newly discovered intermediate polar RX J0558.0+5353. This period nearly coincides with the X-ray period reported by Haberl et al. (1994). ...
  • Determination of the limb darkening of the solar disc in the visible and near ultraviolet 
    Bhattacharyya, J. C; Chandramohan, R; Sundareswaran, A; Charles, A (Indian National Science Academy, 1981)
  • Discovery of a flare star near Sirius 
    Sharma, D. P; Marar, T. M. K; Seetha, S; Shyla, K. S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Rozario, M. J (D. Reidel Publishing Co., 1983-04)
    The discovery of a flare star (R.A. (1950)=6/Suph43/Supm6/Sups.07, Decl.(1950)=–16°45'24") located about 6 arc min south of Sirius is reported. During photometric observations on the night of 13 January, 1982, using the ...
  • Discovery of asteroid number 4130 
    Rajamohan, R; Bhattacharyya, J. C; Kuppuswamy, K; Paranjpye, A; Moorthy, V; Vasundhara, R (Indian Academy of Sciences, 1989-09)
  • Evolution of research in different astronomies in India 
    Bhattacharyya, J. C (The Council of Scientific and Industrial Research, 1986-10)
    The evolution of astronomical studies is reviewed with special reference to important achievements on Indian soil since the introduction of telescopic observations in the early seventeenth century. Important activities ...
  • A Fast Optical Pulse Counting system for Crab Pulsar 
    Santhanam, P; Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1985-11)
    A sub millisecond resolution counting system for recording shapes of short periodic pulses is described. Results obtained in recording the shape of optical pulses from Crab pulsar are given here. The flexibility of the ...
  • Flares on AM Canum Venaticorum 
    Marar, T. M. K; Padmini, V. N; Seetha, S; Narayanan Kutty, K. R; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (European Southern Observatory, 1988-01)
    AM CVn, an interacting binary system consisting of two helium white dwarfs, has been classified as a nova-like object. Normally it exhibits only small amplitude modulations of 0.05 mag with a 1051 s periodicity. The authors ...
  • Further photometric observations of the cataclysmic variable PG 1012-029 
    Ashoka, B. N; Marar, T. M. K; Seetha, S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (Kluwer Academic Publishers, 1993)
    We report time series photometric observations of PG 1012-029, conducted during 1990 and 1991. Light curves of three consecutive eclipses recorded in a single night are presented. The enhanced pre-eclipse hump in our data ...
  • Gravitational instability of interstellar magnetic clouds 
    Ghosh, K. K; Bhattacharyya, J. C (D. Reidel Publishing Co.,, 1985-12)
    The gravitational instability of a nonrotating isothermal gaseous disk permeated by a uniform frozen-in magnetic field is investigated using a fourth-order perturbation technique. From the results it is found that the disk ...
  • High speed photometry of dwarf nova EX Hydrae 
    Sharma, D. P; Marar, T. M. K; Seetha, S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (INSDOC, 1983-08)
    High speed optical photometric observations of the hard X-ray source EX Hya, carried out with the reflector of the Kevalur Observatory, are presented. The observations with time resolutions of 1 s or 2 s were made on four ...
  • High speed photometry of PG 1012-029 
    Ashoka, B. N; Seetha, S; Marar, T. M. K; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (European Southern Observatory, 1994-03)
    High speed optical photometric observations of PG 1012 - 029, conducted during 1990-1991, confirm the nova-like classification of the object. Several eclipses observed by us have been used to refine the orbital period of ...
  • High Speed Photometry of SS Cygni after an Outburst 
    Seetha, S; Padmini, V. N; Marar, T. M. K; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (Konkoly Observatory, 1985-12)
  • High speed photometry of SS cygni after an outburst 
    Seetha, S; Padmini, V. N; Marar, T. M. K; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (Konkoly Observatory, 1985-12-20)
  • HiRES - A high-resolution stigmatic extreme ultraviolet spectroheliometer for studies of the fine-scale structure of the solar chromosphere, transition region, and corona 
    Timothy, J. G; Berger, T. E; Morgan, J. S; Walker, A. B. C; Jain, S. K; Saxena, A. K; Bhattacharyya, J. C; Huber, M. C. E; Tondello, G; Naletto, G (SPIE, 1991-08)
    HiRES is a high-resolution stigmatic EUV spectroheliometer whose 45-cm Gregory telescope is coupled to a spectrometer employing a single toroidal diffraction grating and an imaging pulse-counting multianode microchannel ...
  • HiRES: high resolution extreme ultraviolet spectroheliometer 
    Berger, T; Bergamini, P; Kirby, H; Timothy, J. G; Walker, A. B. C; Bhattacharyya, J. C; Jain, S. K; Saxena, A. K; Huber, M. C. E; Naletto, G; Tondello, G (Cambridge University Press, 1993)
    The HiRES sounding rocket payload is designed to obtain very high spatial, spectral, and temporal resolution images of the solar chromospheric and coronal plasmas in the extreme ultraviolet (EUV) wavelength range from 500 ...

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