IIA Institutional Repository: Recent submissions

  • Spectral Indices and Particle Aging Studies on the Giant Radio Galaxy NGC6251 
    Mack, K. H; Klein, U; Saripalli, L; Willis, A. G; O'Dea, C. P (International Astronomical Union, 1996)
  • Morphologies in Mpc-Size Radio Galaxies 
    Saripalli, L; Subrahmanyan, R; Hunstead, R. W (International Astronomical Union, 1996)
  • General Properties of Giant Radio Galaxies 
    Klein, U; Mack, K. H; Saripalli, L (International Astronomical Union, 1996)
  • Optical to Far-IR Observations of 3C 446 
    Leech, K. J; Saxton, R; Barr, P; Santos-Lleo, M; Jiminez-Bailon; Soundararajaperumal, S (Astronomical Society of Australia, 2002)
    The OVV blazar 3C 446 was monitored over seven months in 1997 with ground based telescopes and instruments on ESA's Infrared Space Observatory (ISO). The aim was to try to detect variations in the IR and see if these were ...
  • Relationship between horizontal flow velocity and cell size for supergranulation using SOHO Dopplergrams 
    Krishan, V; Paniveni, U; Singh, J; Srikanth, R (Royal Astronomical Society, 2002-07)
    A study of 90 supergranular cells obtained from SOHO Dopplergrams was undertaken in order to investigate a possible relation between the sizes and peak horizontal velocities of the cells. For the sample obtained, the two ...
  • Tracking pulsar dispersion measures using the GMRT 
    Ahuja, A. L; Gupta, Y; Kembhavi, A. K; Kulkarni, V (Astronomical Society of India, 2002-09)
    We present preliminary results from an ongoing program of accurate pulsar dispersion measure (DM) measurements using the GMRT. From simultaneous dual frequency observations, we are able to determine OMs to accuracies ...
  • Search for pulsed Te V gamma- rays from Crab pulsar with the TACTIC Imaging gamma-ray Telescope 
    Rannot, R. C; Yadav, K. K; Dhar, V. K; Tickoo, A. K; Bhatt, N; Bhattacharyya, S; Chandra, P; Goyal, H. C; Kaul, C. L; Kaul, R. K; Kothari, M; Kotwal, S; Koul, R; Sahayanathan, S; Sapru, M. L; Sharma, M; Venugopal, K; Bhat, C. L (Astronomical Society of India, 2002-09)
    The TACTIC Imaging Element has observed Crab Nebula/pulsar for a total. of about 40 hours during Jan.- Mar. 2001. Preliminary results do not show any evidence of the 33 ms pulsations from the pulsar direction at an energy ...
  • Diamagnetic screening of the magnetic field in accreting neutron stars 
    Konar, S; Choudhuri, A. R (Astronomical Society of India, 2002-09)
    A possible mechanism for screening of the surface magnetic field of an accreting neutron star, by the accreted material, is investigated. In particular, we investigate the nature of the evolution of the internal ...
  • Radio pulsar emission altitudes 
    Kapoor, R. C; Shukre, C. S (Astronomical Society of India, 2002-09)
    By attributing the often seen longitude offsets between the core and conal component centres of pulsar radio pulses to different emission altitudes, we present a new method for investigating these altitudes. OUf method ...
  • Observations of rotational instabilities in Radio Pulsars 
    Joshi, B. C; Lyne, A. G; Jordan, C; Krawczyk, A; Gil, J. A (Astronomical Society of India, 2002-09)
    Two kinds of irregularities are observed in the rotation rates of pulsars - timing noise and glitches. A study of these irregularities is useful as a probe for the internal structure of these stars. We present the ...
  • A high Galactic latitude search for pulsars 
    Joshi, B. C; Burgay, M; Lyne, A. G; Manchester, R. N; Possenti, A; Camilo, F; Amico, N. D; Kramer, M (Astronomical Society of India, 2002-09)
    Millisecond pulsars (MSPs) are an important class of radio pulsars. Their observed spatial distribution is flux limited and is nearly isotropic. Many such pulsars have been observed at high Galactic latitudes. The ...
  • Near-infrared spectroscopy of Nova Sagittarii 2001 (V4643 Sgr) 
    Ashok, N. M; Banerjee, D. P. K; Varricatt, W. P (Astronomical Society of India, 2002-09)
    Near-infrared spectra of the very fast ReiN-type nova, Nova Sagittarii 2001 (V464a Sgr) obtained in the early decline phase and the period 110 to 170 days after the discovery date are presented. The spectrum in the early ...
  • Optical Spectroscopy of the nova-like variable V 445 Puppis 
    Kamath, U. S; Anupama, G. C (Astronomical Society of India, 2002-09)
    V445 Puppis is a peculiar variable which had a nova-like eruption in December 2000. The early spectra did not show any emission lines of hydrogen or helium. Fe II lines were very dominant during this phase. We present optical ...
  • Speckle interferometric observations of close binary stars 
    Saha, S. K; Chinnappan, V; Yeshwanth, L; Anbazhagan, P (Astronomical Society of India, 2002-09)
    Speckle interferometric technique is employed to record a series of hundreds of short-exposure images of several close binary stars with sub-arc second separation through a narrow band filter at the Cassegrain focus of ...
  • Spectral evolution of LMXB GX 349+2 
    Agrawal, V; Sreekumar, P (Astronomical Society of India, 2002-09)
    Z sources are the brightest low-mass X-ray binaries (LMXB) believed to contain magnetized neutron stars. They trace a '2' shaped track in theil X-ray colour-colour diagram. It is thought that the accretion rate increases ...
  • Gravitating systems with torsion self-interaction 
    Sivaram, C; de Andrade, L. C. G (Kluwer Academic Publishers, 1993-02)
  • Astrophysical limits on gauge invariance breaking in electrodynamics with torsion 
    Sivaram, C; de Andrade, L. C. G (Kluwer Academic Publishers, 1993-02)
    General relativistic electrodynamics in a torsion background can give rise to a situation where the photons can have a non-zero rest mass and magnetic moment. Astrophysical limits are used to constrain these parameters.
  • Density and temperature diagnostics of solar emission lines from NE VI and MG VI 
    Raju, P. K; Gupta, A. K (Kluwer Academic Publishers, 1993-06)
    Line intensity ratios of Ne VI lines with respect to a resonance line of Mg VI have been considered for electron density and temperature determinations within the chromosphere-corona transition region. The electron pressure ...
  • Enhanced star formation in the cometary globules of the GUM nebula 
    Bhatt, H. C (Royal Astronomical Society, 1993-06-01)
    Evidence for an enhanced rate of star formation in the cometary globules of the Gum nebula is presented. The IRAS Point Source Catalog has been searched for sources with spectral energy distributions characteristic of young ...
  • Electrostatic oscillations in the presence of grain-charge perturbations in dusty plasmas 
    Varma, R. K; Shukla, P. K; Krishan, V (The American Physical Society, 1993-05)
    The properties of electrostatic oscillations and instability phenomena are studied, accounting for the time-dependent variation of the grain electric charge due to wave motions in an unmagnetized dusty plasma. It is found ...

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