IIA Institutional Repository: Recent submissions

  • Magnetic braking and low specific angular momenta of elliptical galaxies 
    Ramadurai, S; Indulekha, K (Astronomical Society of India, 1996)
  • Classification of colliding galaxies 
    Narasimhan, K. S. V. S; Sastry, K. S; Alladin, S. M (Astronomical Society of India, 1996)
    we propose a classification scheme for colliding galaxies based on the fractional changes in their binding energy and the orbital energy. We give examples of actual observed pairs of interacting galaxies for the various ...
  • Growth of the Centre of Advanced Study in Astronomy at the Osmania University 
    Abhyankar, K. D (Astronomical Society of India, 1997)
    After giving a brief historical introduction, the 48-inch telescope project is traced through its different phases of site survey, construction of the dome and installation of the telescope. Then follows a review of the ...
  • Analysis of Ly α absorption lines in the vicinity of QSOs 
    Khare, P (Astronomical Society of India, 1996)
    Recent evidence suggesting that at least some of the Lyman alpha forest absorbers are not primordial and are indeed associated with galaxies is disucussed. Proximity effect, which deals with the change in the distribution ...
  • Contribution of turbulence to Tully-Fisher relation 
    Prabhu, R. D; Krishan, V (Astronomical Society of India, 1996)
    We have proposed a model for the flat rotaion curves of spiral galaxies in an earlier paper of ours (Prabhu & Krishan 1994). We could resolve the galactic velocity field for the outer regions into a turbulent and a gravity ...
  • A highly flattened stellar disk in the elliptical galaxy NGC 4564 
    Sahu, D. K; Pandey, S. K; Kembhavi, A. K (Astronomical Society of India, 1996)
    We present the R band isophotal shape analysis of the E6 elliptical galaxy NGC 4564 by fittng ellipses to the observed isophotes using Fourier expansion procedure. The galaxy is found to have pointy isophotes, showing ...
  • Large scale galactic magnetic fields : Need for a new theory of generation 
    Varma, R. K; Pandey, B. P (Astronomical Society of India, 1996)
  • Scattering of light by a periodic structure in the presence of randomness. V. Detection of successive peaks in a periodic structure 
    Vani, V. C; Chatterjee, S (Optical Society of America, 2006-12)
    We address the problem of detecting periodic structures hidden behind roughness. We have shown that if r0 is the coherence length of the scattered radiation, due to the random part of the surface, and Lambda is the wavelength ...
  • Polarization of Starlight by Unresolved and Oblate Extra-solar Planet in Elliptical Orbit 
    Sengupta, S; Maiti, M (University of Chicago Press, 2006-03)
    We calculate the degree of linear polarization of radiation from stars having planets that may not be resolved spatially. We assume single scattering by water and silicate particulates in the planetary atmosphere. The ...
  • A statistical study of wave propagation in coronal holes 
    O`Shea, E; Banerjee, D; Doyle, J. G (Astronomy and Astrophysics, Vol. 463, pp. 713 - 725, 2007-02)
    Aims.To find evidence for propagating magnetoacoustic waves in equatorial and polar coronal hole locations. Methods: Using temporal series data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations ...
  • Evidence for wave harmonics in cool loops 
    O'Shea, E; Srivastava, A. K; Doyle, J. G; Banerjee, D (Astronomy and Astrophysics, Vol. 473, pp. L13 - L16, 2007-10)
    Aims.Using temporal series image data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in intensity (radiance) measurements from the transition region O V 629 line with the aim of finding ...
  • X-ray burster and nuclear reaction rates 
    Rani Deka, I; Duorah, K; Duorah, H. L (Astronomical Society of India, 1996)
  • A study of a macro-spicule and a transition region explosive event in a solar coronal hole 
    Popescu, M. D; Xia, L. D; Banerjee, D; Doyle, J. G (Advances in Space Research, Vol. 40, Issue 7, pp. 1021 - 1025, 2007-02)
    Aims Spicules and the higher macro-spicules (jet-like structures seen at the solar limb) are believed to be the dominant mechanism for mass ejection in the higher solar atmosphere outside active regions. But what is the ...
  • 1.8 MeV emission lines from galactic plane region 
    Bardoloi, I; Duorah, K; Duorah, H. L; Barua, M. M (Astronomical Society of India, 1996)
    The COMPTEL telescope aboard the CGRO satellite has revealed highly significant 1.8 MeV emission lines from the Galactic plane region of the Milky Way Galaxy. The observed concentrated emission region may contain a single ...
  • A statistical study of the characteristics of type II doublet radio bursts 
    Subramanian, K. R; Ebenezer, E (EDP Sciences, 2006-05)
    Aims.We study the characteristics of doublet type II radio bursts in which two type II bursts occur in sequence and investigate their drivers. Methods.37 type II bursts reported by the Culgoora radio observatory in the ...
  • Occultation of a solar active region at 1.5 GHz during the eclipse of November 3, 1994 
    Subramanian, K. R; Sawant, H. S; Fernandes, F. C. R; Cecatto, J. R (EDP Sciences, 2006-03)
    We observed the solar eclipse of November 3, 1994 with a 4-m diameter antenna and a radio spectrograph operating at 1.5 ± 0.05 GHz with a time resolution of 100 ms. Here we present the observations of the occultation of ...
  • The PHEMU97 catalogue of observations of the mutual phenomena of the Galilean satellites of Jupiter 
    Arlot, J. -E; Thuillot, T; Ruatti, C; Akasawa, A; Baroni, S; Beisker, W; Berthier, J; Blanco, C; Boonstra, J; Bourgeois, J; Bulder, H; Casas, R; Castano, J. G; Colas, F; Collins, D; Cuypers, J; Czech, W; D'Ambrosio, V; Denzau, H; Descamps, P; Dimitrescu, A; Dinakarian, N; Dourneau, G; Enriquez, J. M; Fernandez, J. M; Fernandez-Barba, D; Flatres, T; Goncalves, M; Guhl, K; Helmer, G; Hirose, T; Irsmambetova, T. R; Krobusek, B. A; Lecacheux, J; Le Campion, J.-F; Lou, M; Mallama, A; Nelson, P; Okura, N; Park, J; Pauwels, T; Pluchino, S; Priban, V; Rapaport, M; Sacré, J.-J; Salvaggio, F; Sanchez, M. A; Sanchez-Bajo, F; Stefanescu, G; Tanga, P; Tejfel, V. G; Trisan, J. L; Trunkovsky, E. M; Vandenbulcke, G; Vasundhara, R; Vass, G; Vingerhoets, P; Vu, D. T; Wilds, R. T (EDP Sciences, 2006-05)
    In 1997 the Sun and the Earth passed through the equatorial plane of Jupiter and therefore through the orbital planes of its main satellites. During this period, mutual eclipses and occultations occurred and were observed. ...
  • Longitude of the honourable East India Company's observatory at Madras 
    Taylor, T. G (The Royal Astronomical Society, 1845-06)
  • Research with a moderate aperture telescope 
    Bappu, M. K. V (1975)
  • Automated classification and stellar parameterization 
    Giridhar, S; Muneer, S; Goswami, A (Memorie della Societa Astronomica Italiana, 2006)
    Different approaches for automated spectral classification are critically reviewed. We describe in detail ANN based methods which are very efficient in quick handling of the large volumes of data generated by different ...

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