Publications of Astronomical Society of India: Recent submissions

  • Why quantum mechanics is complex 
    Wheeler, J. T (Astronomical Society of India, 1997)
    The zero-signature Killing metric of a new, real-valued, 8-dimensional gauging of the conformal group accounts for the complex character of quantum mechanics. The new gauge theory gives manifolds which generalize curved, ...
  • The equivalence of precession phenomena in metric theories of gravity 
    Krisher, T. P (Astronomical Society of India, 1997)
    The requirement of general covariance imparts to metric theories of gravity, such as general relativity, important structural features. A precise mathematical form results, ensuring that computation of observable physical ...
  • Origin of electric and magnetic fields in the early universe 
    Davies, J. B (Astronomical Society of India, 1997)
    A fundamental unanswered question of cosmology is the origin of the magnetic fields observed in the various types of astrophysical bodies. It is still argued whether these magnetic fields are primordial or whether they ...
  • How impossible is topology change? 
    Borde, A (Astronomical Society of India, 1997)
    It is often stated that topology change is impossible in classical general relativity. In particular, it appears to be widely believed that the pleasure of topology change comes at a fixed price: topology – changing space ...
  • The importance of multispectral band observations of gamma-ray bursts 
    Lazzati, D (Astronomical Society of India, 2002)
    Gamma-Ray Bursts are one of the best examples to show how mult iwavelength observations can help in our understanding of the universe. Gamma-Ray Bursts were a mystery for more than thirty years, during which they could be ...
  • Speckle interferometric observations of the collision of comet Shoemaker-Levy 9 with Jupiter 
    Saha, S. K; Rajamohan, R; Vivekananda Rao, P; Sunder, G. S; Swaminathan, R; Lokanandham, B (Astronomical Society of India, 1997)
    Speckle interferometric technique has been used to obtain a series of short exposure images of the collision of comet Shoemaker-Levy 9 with Jupiter during the period of July 17-24, 1994 using the Nasmyth focus of 1.2 meter ...
  • The effect of aberrations on image quality - A study for the 1.2m Gurusikhar Infrared Telescope 
    Banerjee, D. P. K; Bobra, A. D; Subhedar, D. V (Astronomical Society of India, 1997)
    The achromatic aberrations, which in general affect image quality in telescopes, have been studied in context of the 1.2 m Gurusikhar Infrared Telescope. The analysis gives the magnitudes of aberrations for different fields ...
  • Approaching gravitation by quantum gravity with matter near four dimensions 
    Elizalde, E; Odintsov, S. D; Romeo, A (Astronomical Society of India, 1997)
    The phase structure and infrared (IR) behavior of higher-derivative quantum gravity (QG) near (but below) four dimensions, with a few different matter theories, shows remarkable properties. Models of this sort can be ...
  • Pulsar observations at 150 MHz with Mauritius Radio Telescope - Preliminary results 
    Issur, N. H (Astronomical Society of India, 1997)
    The Mauritius Radio Telescope (MRT) has been used to observe some Southern Hemisphere pulsars at 151.6 MHz. A tracking system allowing observation of a source for 8 x sec (δ) minutes of time and a Fast Data Acquisition ...
  • On the triggering of quiet region flares without filament activation 
    Sundararaman, K; Selvendran, R (Astronomical Society of India, 1997)
    Using Kodaikanal Observations we have analysed the cases of quiet region flares which are not associated with any filament activation. The rotations of the plages play a major role in triggering these spotless flares. The ...
  • On the correlation between line width and line depth of the solar HeI 1083 NM line 
    Venkatakrishnan, P; Sakurai, T; Suematsu, Y; Ichimoto, K (Astronomical Society of India, 1997)
    Seven sets of spectra in the region of the HeI 1083 nm absorption line of the active region NOAA 7558 + 7562 near the west limb, obtained at Norikura Solar Observatory, National Astronomical Observatory, Japan have been ...
  • Historical aspects of gamma-ray astronomy 
    Sreekantan, B. V (Astronomical Society of India, 2002)
    Over the entire 20th century, Cosmic Rays proved to be the watershed of fundamental knowledge from which poured out several streams that made us familiar with aspects of the universe that could never have been known through ...
  • MSX Observations of Diffuse UV Emission in Orion 
    Murthy, J; Henry, R. C; Paxton, L. J; Price, S. D (Astronomical Society of India, 2001)
    We have observed intense diffuse radiation in the UV (1400 Å - 2600 Å) from three fields around M42 in Orion. Intensities of 20000 photons cm-2 sr-1 s-1 Å-1 were observed to the east and west of M42 with 8000 photons cm-2 ...
  • Observations of occulation of HIP 66446 by (423) Diotima on 2001 March 15 from India - Detection of a companion to the star 
    Vasundhara, R; Jayakumar, K; Velu, C; Appakutty, M; Paranjpye, A; Kulkarni, H; Nitsure, P; Prabhunne, M; Shah, K (Astronomical Society of India, 2001)
    Observations of the occulation of the star HIP 66446 by (423) Diotima on 2001 March 15 made by the team at the Vainu Bappu Observatory and three mobile teams at Ganeshgudi, Londa and the CES Field Research Station at Sirsi ...
  • Performance of the IIA mosaic CCD camera system 
    Naidu, B. N; Srinivasan, R; Mohan, V; Sagar, R (Astronomical Society of India, 2001)
    We evaluate performance of the 4K x 4K mosaic CCD camera system developed at the Indian Institute of Astrophysics using four Thomson CCDs in a buttable configuration. The camera system consists of a mosaic CCD dewar developed ...
  • Search for Microlensing Events Towards M31 Galaxy 
    Joshi, Y. C; Pandey, A. K; Narasimha, D; Sagar, R (Astronomical Society of India, 2001)
    M31, the prominent galaxy of the Local Group, is located at a distance of about 700 kpc. Due to its convenient orientation, it is an alluring target for gravitational microlensing to search for massive astrophysical compact ...
  • A deep V I CCD photometric study of the neglected galactic star cluster NGC 6631 
    Sagar, R; Naidu, B. N; Mohan, V (Astronomical Society of India, 2001)
    We present the V I CCD photometric observations of about 5500 stars up to a limiting magnitude of V ~ 20 in an area of ~ 16? x 16? around the cluster NGC 6631. The cluster parameters determined for the first time by fitting ...
  • CCD observations of mutual events of Jovian satellites from VBO during 1997 
    Vasundhara, R; Chakraborty, P; Appakutty, M; Dinakaran, N; Ganeshan, M; Kuppuswamy, K; Moorthy, V; Muniyandi, A; Selvakumar, G; Velu, C; Ramana, K. V (Astronomical Society of India, 2001)
    CCD observations of the mutual events of the Galilean satellites of Jupiter from the Vainu Bappu Observatory during 1997 are presented. The derived times of close approach of the geometric centers of the satellites (satellite ...
  • The Gamma Ray Burst experiment on the Indian SROSS C-2 satellite 
    Sinha, S; Sreekumar, P; Kasturirangan, K (Astronomical Society of India, 2001)
    The SROSS C-2 satellite launched by the ASLV carried aloft a CsI gamma ray burst detector. To date, 51 GRB events have been detected unambiguously with 22 being common with BATSE. The experiment with its 2 ms time resolution, ...
  • Energy resolution of the TACTIC imaging element 
    Sathyabama, N; Dhar, V. K; Koul, M. K; Bhat, C. L (Astronomical Society of India, 2001)
    We explore here the possibility of using artificial neural network (ANN) for characterization of atmospheric Cerenkov events (progenitor type and energy) detected by the imaging gamma-ray telescope array, TACTIC.

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