IIAP Publications: Recent submissions

  • On the black hole trail: a personal journey 
    Vishveshwara, C. V (Indian academy of Sciences, 1996-12)
  • Probing the Evolution of the Gas Mass Fraction with the Sunyaev-Zeldovich Effect 
    Majumdar, S (American Astronomical Society, 2001-07)
    Study of the primary anisotropies of the cosmic microwave background (CMB) can be used to determine the cosmological parameters to a very high precision. The power spectrum of the secondary CMB anisotropies due to the ...
  • Modelling of a solar coronal loop 
    Krishan, V (Cambridge University Press, 1996-12)
    Montgomery and co-workers have developed a framework to describe the steady state of a turbulent magnetofluid, without the usual recourse to linearization. Thus the magnetic and velocity fields emerge in their fully nonlinear ...
  • Understanding the Radio Emission Geometry of PSR B0329+54 
    Gangadhara, R. T; Gupta, Y (American Astronomical Society, 2001-07)
    We have analyzed high-quality single-pulse data of PSR B0329+54 at 325 and 606 MHz to study the structure of the emission beam. Using the ``window-threshold technique,'' which is suitable for detecting weak emission ...
  • Abundance analyses of cool extreme helium stars 
    Pandey, G; Kameswara Rao, N; Lambert, D. L; Jeffery, C. S; Asplund, M (Royal Astronomical Society, 2001-07)
    Extreme helium stars (EHes) with effective temperatures from 8000 to 13000K are among the coolest EHes and overlap the hotter R CrB stars in effective temperature. The cool EHes may represent an evolutionary link between ...
  • Are radio pulsars strange stars? 
    Kapoor, R. C; Shukre, C. S (EDP Sciences, 2001-08)
    A remarkably precise observational relation for pulse core component widths of radio pulsars is used to derive stringent limits on pulsar radii, strongly indicating that pulsars are strange stars rather than neutron stars. ...
  • Temporal and spatial variations of the quiet upper chromosphere from SOHO/SUMER observations of hydrogen Lyman lines 
    Kariyappa, R; Varghese, B. A; Curdt, W (EDP Sciences, 2001-08)
    We have analyzed a time series of spectra in the hydrogen Lyman lines and the Lyman continuum obtained by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the SOlar Heliospheric Observatory ...
  • SiO maser survey of AGB stars in the North Galactic Cap 
    Ita, Y; Deguchi, S; Fujii, T; Kameya, O; Miyoshi, M; Nakada, Y; Nakashima, J; Parthasarathy, M (EDP Sciences, 2001-09)
    A SiO maser survey in the J=1-0, v=1 and 2 transitions has been made for IRAS sources in the North Galactic Cap b > 30o) with the Nobeyama 45 m radio telescope. The sources were selected on the basis of their IRAS 12/25-μm ...
  • Luminosity function of GRBs 
    Sethi, S; Bhargavi, S. G (EDP Sciences, 2001-09)
    A SiO maser survey in the J=1-0, v=1 and 2 transitions has been made for IRAS sources in the North Galactic Cap b > 30o) with the Nobeyama 45 m radio telescope. The sources were selected on the basis of their IRAS 12/25-μm ...
  • Upper Limits on O VI Emission From Voyager Observations 
    Murthy, J; Henry, R. C; Shelton, R. L; Holberg, J. B (American Astronomical Society, 2001-08)
    We have examined 426 Voyager fields distributed across the sky for O VI λλ1032, 1038 emission from the Galactic diffuse interstellar medium. No such emission was detected in any of our observed fields. Our most constraining ...
  • General relativistic spectra of accretion discs around rapidly rotating neutron stars: effect of light bending 
    Bhattacharyya, S; Bhattacharya, D; Thampan, A. V (Royal Astronomical Society, 2001-08)
    We present computed spectra, as seen by a distant observer, from the accretion disc around a rapidly rotating neutron star. Our calculations are carried out in a fully general relativistic framework, with an exact treatment ...
  • A Study of the Emission-Line Spectra and the Stellar Populations of Starburst Galaxies 
    Ravindranath, S; Prabhu, T. P (Springer, 2001-03)
    Based on optical-NIR spectra, we discuss the nebular properties and stellar populations of starburst nuclei. Starbursts are found to have higher electron densities and higher excitations than HII nuclei. The emission lines ...
  • The Luminosity Function and Size Distribution of HII Regions in NGC 1365 
    Ravindranath, S; Prabhu, T. P (Springer, 2001-03)
    We present the HII region luminosity function and size distribution obtained for the HII regions in NGC 1365. The diameters were corrected for the effects of seeing using a Wiener image restoration procedure. The luminosities ...
  • Does the Poleward Migration Rate of the Magnetic Fields Depend on the Strength of the Solar Cycle? 
    Makarov, V. I; Tlatov, A. G; Sivaraman, K. R (Springer, 2001)
    We present the pattern of the polar magnetic reversal for cycle 23 derived from Hα synoptic charts and have also included the reversals of the earlier cycles 18-22 for comparison. At the beginning of a new cycle (i.e., ...
  • IUE and ISO observations of the bipolar proto-planetary nebula Hen 401 (IRAS 10178-5958) 
    Parthasarathy, M; García-Lario, P; Gauba, G; de Martino, D; Nakada, Y; Fujii, T; Pottasch, S. R; de Cordoba, L. S. F (EDP Sciences, 2001-09)
    We present ultraviolet (IUE) and infrared (ISO) observations of the bipolar proto-planetary nebula Hen 401 which, combined with previously available optical and near infrared data, are used to reconstruct the overall ...
  • Decameter Wavelength Observations of an Absorption Burst from the Sun and Its Association with an X2.0/3B Flare and the Onset of a ``Halo'' Coronal Mass Ejection 
    Ramesh, R; Ebenezer, E (The American Astronomical Society, 2001-09)
    We report a transient intensity reduction/absorption burst observed at decameter wavelengths in close temporal association with an X2.0/3B flare near the disk center and the onset of a ``halo'' coronal mass ejection. The ...
  • Dynamics of embedded protostar clusters in clouds 
    Gorti, U; Bhatt, H. C (Royal Astronomical Society, 1996-01)
    The dynamics of clumps and protostars in a young protocluster system embedded in its parent molecular cloud are studied here through numerical simulations. It is found that the presence of massive clumps and their dynamics ...
  • A Dust Lane in the Radio Galaxy 3C 270 
    Mahabal, A; Kembhavi, A; Singh, K. P; Bhat, P. N; Prabhu, T. P (American Astronomical Society, 1996-02)
    We present the broad band surface photometry of the radio galaxy 3C 270 (NGC 4261). We find a distinct dust lane in the V - R image of the galaxy and determine its oriantation and size. We use the major axis profile of the ...
  • Spectral line radiation from solar small-scale magnetic flux tubes 
    Kneer, F; Hasan, S. S; Kalkofen, W (European Southern Observatory, 1996-01)
    We consider spectral line radiation from small-scale magnetic model flux tubes in the solar atmosphere. The structure of the tube is determined from the magnetostatic equations in the thin flux tube approximation. We assume ...
  • Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity 
    Raiteri, C. M; Villata, M; Aller, H. D; Aller, M. F; Heidt, J; Kurtanidze, O. M; Lanteri, L; Maesano, M; Massaro, E; Montagni, F; Nesci, R.; Nilsson, K; Nikolashvili, M. G; Nurmi, P; Ostorero, L; Pursimo, T; Rekola, R; Sillanpää, A; Takalo, L. O; Teräsranta, H; Tosti, G; Balonek, T. J; Feldt, M; Heines, A; Heisler, C; Hu, J.; Kidger, M; Mattox, J. R; McGrath, E. J; Pati, A. K; Robb, R; Sadun, A. C; Shastri, P; Wagner, S. J; Wei, J; Wu, X (E D P Sciences, 2001-10)
    The BL Lacertae object AO 0235+16 is well known for its extreme optical and radio variability. New optical and radio data have been collected in the last four years by a wide international collaboration, which confirm the ...

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