IIA Institutional Repository: Recent submissions

  • UBV photometry of the eclipsing binary R Canis Majoris 
    Radhakrishnan, K. R; Sarma, M. B. K; Abhyankar, K. D (Astronomical Society of India, 1985-09)
  • H-alpha flare associated microwave emissions 
    Jain, Rajmal (Astronomical Society of India, 1985-09)
  • On the dependence of solar flare occurrence on sunspot polarity 
    Verma, V. K; Shelke, R. N (Astronomical Society of India, 1985-09)
    The possibility of predicting flare occurrence on the sun has been examined. It is noticed that the p-polarity dominant spot groups are more productive of flares than the f-polarity dominant spot groups. This high productivity ...
  • Eruptive prominences and long-delay geomagnetic distrubances 
    Sastri, J. H; Ramesh, K. B (Astronomical Society of India, 1985-09)
  • Vacuum fluctuations in Einstein`s elevator 
    Padmanabhan, T (Astronomical Society of India, 1985-09)
    Vacuum fluctuation in the Einstein`s elevator (which mimics a constant gravitational field) is analysed without introducing a plethora of extraneous vacuum states. In the elevator there is no particle creation, through the ...
  • Spacetime curvature, rotation and the pulse profile of fast pulsars 
    Datta, B; Kapoor, R. C (Astronomical Society of India, 1985-09)
    Propagation of photons in the spacetime exterior to a rapidly rotating neutron star is investigated, using a rotationally perturbed spherical metric, to determine the pulse profile of fast pulsars. We find that spacetime ...
  • Madras Observatory: The Beginning 
    Kochhar, R. K (Astronomical Society of India, 1985-06)
    We present evidence to show that the Madras Observatory-to which Indian Institute of Astrophysics (IIA) traces its origin-was formed, and observations started, in the year 1786. We also discuss how the erroneous date of ...
  • An Astronomical Polarimeter 
    Deshpande, M. R; Joshi, U. C; Kulshrestha, A. K; Banshidar; Vadher, N. M; Mazumdar, H. S; Pradhan, S. N; Shah, C. R (Astronomical Society of India, 1985-06)
    A polarimeter for the study of astronomical objects has been developed and calibrated. Observations of several objects have been made. The polarimeter covers the spectral range from 3150 A to 8500 A in standard N, U, B, ...
  • The Microprocessor control of the Kavalur 234-cm optical telescope 
    Chinnappan, V; Bhattacharyya, J. C (Astronomical Society of India, 1985-06)
    This paper gives an introduction to the control system of the 234-cm optical telescope. The computer used in control is based on an INTEL 16 bit microprocessor. The VAX 11/780 system has a supervisory role in the control ...
  • Time delay between H-alpha and soft x-ray emissions during solar flares 
    Verma, V. K; Pande, M. C (Astronomical Society of India, 1985-06)
    A statistical analysis of time delays between H-alpha and soft x-ray (SXR) emissions at onset and peak respectively during solar flares is presented. We find that at the onset of flares SXR emission starts simultaneously ...
  • Energetics of a Kerr blackhole in electromagnetic fields: Role of the relative angular velocity of charged particles 
    Parthasarathy, S; Dhurandhar, S. V; Dadhich, N (Astronomical Society of India, 1985-06)
  • Probable additional Swan band lines in the Solar spectrum 
    Sinha, K; Mehrotra, M (Astronomical Society of India, 1985-06)
    Several unidentified spectral features in the solar spectrum are listed by Moore et al. (1966). They are traceable in the atlas by Delbouille et al. (1973). We attempt to identify some of these features in the region lamda ...
  • The Crab nebula and other historical supernova remnants 
    Trimble, V; Clark, D. H (Astronomical Society of India, 1985-06)
    We outlined briefly what is meant by the phrase 'historical supernovae' and how objects described by it have been identified. The history of the discovery and study of the Crab nebula are reviewed, with emphasis on recent ...
  • Spectrum of SN 1983n in NGC 5236 at maximum light 
    Prabhu, T. P (Astronomical Society of India, 1985-03)
    The spectrum of SN 1983n in NGC 5236 (M83) obtained at its light maximum is presented. The spectrogram was digitized and smoothed using optimal filter technique in Fourier space. The moonlight background was subtracted ...
  • Propagation of type II burst shock waves along the radial magnetic field in the solar corona 
    Shelke, R. N; Pande, M. C (Astronomical Society of India, 1985-03)
    We present an analysis which indicates that in several cases coronal holes exist in the vicinity of the active regions producing type II bursts. It is inferred that shock waves which produce type II bursts essentially ...
  • On the location of Solar Active Longitudes 
    Shelke, R. N; Verma, V. K (Astronomical Society of India, 1985-03)
    The longitudinal distributions of sudden ionospheric disturbances producing active regions with high flare activity and/or with at least one high energy flare particle event (PCA or GLE) have been examined. These active ...
  • What do we know about neutron stars? 
    Kundt, W (Astronomical Society of India, 1985-03)
  • The Very Early Universe: Problems and Perspectives 
    Narlikar, J. V (Astronomical Society of India, 1985-03)
  • Spectral types of a few 'Unientified' Equatorial Infrared Catalogue 1 (EIC-1) sources 
    Prabhu, T. P; Iyengar, K. V. K (Astronomical Society of India, 1984-12)
    Spectral types are assigned to 13 'unidentified' Equatorial Infrared Catalogue 1 (EIC-1) sources from a study of their spectra in the wavelength interval 5200-8700 A. Their spectral types range from M4.5 to M6.5. We infer ...
  • Spectroscopic orbit of R CMa 
    Radhakrishnan, K. R; Abhyankar, K. D; Sarma, M. B. K (Astronomical Society of India, 1984-12)
    Spectroscopic observations of the Algol-type binary R CMa during 1980-81 are presented and definitive orbital elements obatined by combining all available measurements of radial velocity. Near circularity of the orbit and ...

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