IIAP Publications: Recent submissions

  • The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125 
    Updike, A. C; Haislip, J. B; Nysewander, M. C; Fruchter, A. S; Kann, D. A; Klose, S; Milne, P. A; Williams, G. G; Zheng, W; Hergenrother, C. W; Prochaska, J. X; Prochaska, J. X; Mirabal, N; Thorstensen, J. R; van der Horst, A. J; Starling, R. L. C; Racusin, J. L; Burrows, D. N; Kuin, N. P. M; Roming, P. W. A; Bellm, E; Hurley, K; Li, W; Filippenko, A. V; Blake, C; Starr, D; Falco, E. E; Brown, W. R; Dai, X; Deng, J; Xin, L; Qiu, Y; Wei, J; Urata, Y; Nanni, D; Palazzi, E; Greco, G; Bartolini, C; Guarnieri, A; Piccioni, A; Pizzichini, G; Terra, F; Misra, K; Bhatt, B. C; Anupama, G. C; Fan, X; Jiang, L; Wijers, R. A. M. J; Reichart, D. E; Eid, H. A; Bryngelson, G; Puls, J; Goldthwaite, R. C; Hartmann, D. H (The American Astronomical Society, 2008-09)
    We report on multiwavelength observations, ranging from X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption lines due to O I, Si II, and ...
  • Spectroscopic Studies of the Solar Corona - V. Physical Properties of Coronal Structures 
    Singh, J; Sakurai, T; Ichimoto, K; Muneer, S (Springer, 2003-02)
    Spectra around the 6374 Å [Fex] and 7892 Å [Fexi] emission lines were obtained simultaneously with the 25-cm coronagraph at Norikura Observatory covering an area of 200' '×500' ' of the solar corona. The line width, peak ...
  • Long-Term Variations in the Solar Differential Rotation 
    Javaraiah, J (Springer, 2003-01)
    Using Greenwich data (1879 1976) and SOON/NOAA data (1977 2002) on sunspot groups we found the following results: (i) The Sun's mean (over all the concerned cycles during 1879 1975) equatorial rotation rate (A) is significantly ...
  • Pc-scale study of radio galaxies and BL Lacs 
    Kharb, P; Shastri, P; Gabuzda, D. C (Elsevier, 2003-10)
    We study two aspects of the differences between Active Galactic Nuclei (AGN) of the two Fanaroff-Riley types in order to investigate the causes of the F-R divide. We: (a) contrast the properties of the optical cores in ...
  • Photometry of BD -7 deg 3007 
    Shylaja, B. S (Kluwer Academic Publishers, 1987-02)
    Photometric observations of BD -7°3007 in B and V filters are reported. Rapid flickering appears to be present at all phases, implying an unfavourable angle of inclination of orbit for seeing eclipse effects. A modulation ...
  • Cosmological constraint on black hole temperatures 
    Sivaram, C (American Association of Physics Teachers, 1983-03)
  • Cosmic Strings and Celestial Objects 
    Sivaram, C (Nature Publishing Group, 1987-05)
  • Radio emission by parallel acceleration mechanism 
    Krishan, V; Sivaram, C (Springer, 1983-04)
    The equations describing the linear-acceleration mechanism of radiation emission are generalized and applied to type III and IIIb solar radio bursts. A general expression for the power emitted by an electron in a spatially ...
  • The optical spectrum of nova LW Serpentis 1978 
    Prabhu, T. P; Anupama, G. C (Kluwer Academic Publishers, 1987-03)
    Optical spectroscopic data of the nova LW Serpentis 1978, covering its diffuse-enhanced phase until the onset of the forbidden O I line flash, were obtained at the Vainu Bappu Observatory, Kavalur, between March 10 and ...
  • Absorption bursts in the radio emission from the sun at decameter wavelengths 
    Sastry, Ch. V; Subramanian, K. R; Krishan, V (Gordon and Breach Science Publishers, 1983)
    Some characteristics of sudden decreases in the observed radio emission from the sun at decameter wavelengths are presented, and possible interpretations are discussed. These 'absorption bursts' occurred during periods of ...
  • Maximum Entropy Method for Polarized Images 
    Shevgaonkar, R. K (The European Southern Observatory, 1987-04)
    A simple maximum entropy method algorithm for deconvolving polarized images obtained from synthesis observations has been described here. A general purpose Fortran program is also developed. it demonstrated that although ...
  • Why has Uranus toppled over? 
    Kochhar, R. K (Indian Academy of Sciences, 1989-10)
  • Localization of Io and non-Io sources of Jovian decameter emission 
    Boischot, A; Sastri, J. H; Zarka, P (The European Southern Observatory, 1987-03)
    The observation of interplanetary scintillations (IPS) of the decameter radio emission from Jupiter provides information about the structure and position of the sources of emission. The paper presents the analysis of all ...
  • Lower bounds on neutron star mass and moment of inertia implied by the millisecond pulsar 
    Datta, B; Ray, A (The Royal Astronomical Society, 1983-08)
    The short period of the millisecond pulsar PSR 1937+214 implies that it could be close to the onset of rotational instabilities. Conditions of rotational stability imply lower bounds on the mass and moment of inertia and ...
  • Poleward migration of the magnetic neutral line and the reversal of the polar fields on the sun. I - Period 1945-1981 
    Makarov, V. I; Fatianov, M. P; Sivaraman, K. R (Springer, 1983-06)
    Poleward migration of the magnetic neutral line on the sun has been calculated for the periods 1945-1950 and 1955-1981 using synoptic charts based on H-alpha observations. Epochs of sign reversal of the solar magnetic field ...
  • Aberration and advection effects in a plane-parallel medium in motion 
    Peraiah, A (American Astronomical Society, 1987-06)
    The effects of aberration and advection terms in the fluid-frame steady-state radiative-transfer equation are evaluated by means of numerical computations for plane-parallel media moving at velocities 1000, 2000, 3000, ...
  • Poleward migration of the magnetic neutral line and the reversal of the polar fields on the sun. II - Period 1904-1940 
    Makarov, V. I; Sivaraman, K. R (Springer, 1983-06)
    Poleward migration of the magnetic neutral line on the sun has been computed for the period 1904-1940 using synoptic charts based on H-alpha observations and the epochs of sign reversal of the solar magnetic field at ...
  • Broad-band, high-resolution photograph of the solar corona February 16, 1980 
    Scaria, K. K (Springer, 1983-06)
    Unsharp masking may be used for better reproduction of over-exposed solar corona photographs.
  • Rotating neutron star structure - Implications of the millisecond pulsar PSR 1937 + 214 
    Ray, A; Datta, B (The American Astronomical Society, 1984-07)
    Rapidly rotating fluid objects of a given mass can remain stable only up to a critical angular speed, beyond which they may undergo instabilities leading to disruption. A semi-Newtonian condition of rotational stability ...
  • Neutron oscillation and the primordial magnetic field 
    Sivaram, C; Krishan, V (Gordon and Breach Science Publishers, 1983)
    The phenomenon of neutron-antineutron oscillations, recently proposed as a novel consequence of grand unified theories, permits limits to be placed on any primordial field present during the nucleosynthetic stage of the ...

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