IIA Institutional Repository: Recent submissions

  • Further VLA observations of hydrogen deficient stars 
    Kameswara Rao, N; Venugopal, V. R; Patnaik, A. R (Indian Academy of Sciences, 1987-09)
    VLA observations at 6 cm have been obtained for three hydrogen-deficient objects (Upsilon Sgr, V 348 Sgr, and Abell 58). Abell 58 was also observed at 2 cm. Only upper limits to the flux density could be set for these ...
  • Observations of hydrogen deficient binary Upsilon Sagittarii 
    Kameswara Rao, N; Venugopal, V. R (Indian Academy of Sciences, 1985-06)
    The absolute magnitude M(v) of the hydrogen deficient binary Upsilon Sgr has been estimated as -4.8 + or - 1.0 from the distribution of the interstellar reddening, polarization, and interstellar lines of the surrounding ...
  • The 1995 Total Solar Eclipse: An Overview 
    Singh, J (Indian Institute of Astrophysics, 1997)
    As we know, we owe the discovery of solar corona to the observation of total solar eclipse. Inspite of all that has been learned, coronal studies still remain the most important aspect of scientific investigation during ...
  • Ab initio determination of polarizabilities and van der Waals coefficients of Li atoms using the relativistic coupled-cluster method 
    Wansbeek, L. W; Sahoo, B. K; Timmermans, R. G. E; Das, B. P; Mukherjee, D (The American Physical Society, 2008-07)
    We report on a technique to determine the van der Waals coefficients of lithium (Li) atoms based on relativistic coupled-cluster theory. These quantities are determined using the imaginary parts of the scalar dipole and ...
  • Astrophotography with high angular and temporal resolution: Preliminary results from the Kavalur Experiments 
    Saha, S. K; Venkatakrishnan, P; Jayarajan, A. P; Jayavel, N (Indian Academy of Sciences, 1987-10)
    Preliminary results in the form of photographs obtained with high angular (≈ 0.”1) and temporal ( ≈ 33 to 6ms) resolutions using 1-m reflector at the Vainu Bappu Observatory in Kavalur are presented. These results demonstrate ...
  • Nonlinear development of convective instability within slender flux tubes. II - The effect of radiative heat transport 
    Venkatakrishnan, P (Indian Academy of Sciences, 1985-03)
    Inclusion of radiative heat transport in the energy equation for a slender flux tube leads to oscillations of the tube. The amplitude of the oscillations depends on the radius of the tube when lateral heat exchange alone ...
  • Relativistic star clusters with large central redshifts 
    Das, P. K (The Royal Astronomical Society, 1984-10)
    Previous calculations of the velocity distribution function for a star cluster scenario of a class of core-envelope type static, stable, massive equilibrium configurations, capable of giving high internal gravitational ...
  • On the dynamical evolution of a spheroidal cluster 
    Sunder, G. S; Kochhar, R. K (The Royal Astronomical Society, 1985-03)
    Tensor virial equations are used to investigate the dynamical evolution of a cluster of mass points characterized by a spheroidal (homogeneous or heterogeneous) distribution of matter and an isotropic distribution of ...
  • Possible Detection of a Ring System in Saturn's Magnetosphere 
    Vasundhara, R; Bhattacharyya, J. C; Santhanam, P; Pande, A. K; Mohan, V; Mahra, H (Nature Publishing Group, 1984-12)
    The region of the magnetosphere of Saturn around 14 radii and 19 radii has been of special interest since the detection of anomalous dips in the low-energy plasma ion-density in these regions by the Voyager 1, Voyager 2 ...
  • Brightness, polarization and electron density of the solar corona of 1980 February 16 
    Sivaraman, K. R; Jayachandran, M; Scaria, K. K; Babu, G. S. D; Bagare, S. P; Jayarajan, A. P (Indian Academy of Sciences, 1984-06)
    During the eclipse of 1980 February 16 the authors photographed the solar corona at an effective wavelength of 6300 Å. Using a quadruple camera coronal pictures were obtained in polarized light for four polaroid orientations. ...
  • Fast electron generation in quasiperpendicular shocks and type II solar radiobursts 
    Krasnoselskikh, V. V; Kruchina, E. N; Volokitin, A. S; Thejappa, G (European Southern Observatory, 1985-08)
    The paper is devoted to the theory of type II solar radio bursts caused by collisionless shock waves propagating in the coronal plasma. The model developed is based on the theory of collisionless shock waves, which predicts ...
  • VLA observations of extreme hydrogen deficient stars 
    Kameswara Rao, N; Venugopal, V. R; Patnaik, A (Indian Academy of Sciences, 1985-09)
    Observations at 2 and 6 cm have been obtained for six hydrogen-deficient stars R CrB, HD 160641, BD -9 deg 4395, V 348 Sgr, MV Sgr, and Upsilon Sgr by means of the National Radio Astronomy Observatory's Very Large Array ...
  • Morphology of the bipolar planetary nebula NGC 2346 from emission line profile studies 
    Anandarao, B. G; Banerjee, D. P. K; Desai, J. N; Jain, S. K; Mallik, D. C. V (Royal Astronomical Society, 1988-11)
    High resolution observations of H-alpha 6563-A, forbidden O-III 5007 A, and forbidden N-II 6583-A emission lines in the bipolar planetary nebula NGC 2346 are presented. From the widths of the alpha and forbidden N-II lines, ...
  • Astrophysical consequences of n-nmacr oscillations - (Reply) 
    Sivaram, C; Krishan, V (Nature Publishing Group, 1984-06)
  • Patchy occurrence of equatorial spread-F 
    Sastri, J. H (European Geosciences Union, 1985-10)
    From a statistical analysis of ionogram data of Kodaikanal (dip 3.5 deg N) it is shown that, during years of high sunspot activity, the discontinuous or patchy occurrence of equatorial spread-F (ESF) depends on season. ...
  • A probable initial configuration of a flaring loop 
    Krishan, V (Institute of Physics, 1986-02)
    A clue to the preflare configuration of a magnetic loop is obtained based on Taylor's hypothesis that the decay of energy to a minimum with magnetic helicity remaining constant leads to a force free state. The numerical ...
  • Sun as a star - Rotation rates from the CA K-index 
    Singh, J; Livingston, W. C (Kluwer Academic Publishers, 1987-09)
    Daily measurements for 18 months made at Tucson of the Ca K-index in integrated sunlight have been used to derive solar rotation rates. Power spectral analysis shows that one can obtain a well defined value of solar rotation ...
  • Influence of variable permeability on combined free and forced convection about inclined surfaces in porous media 
    Chandrasekhara, B. C; Namboodiri, P. M. S (Elsevier, 1985-01)
    The analysis is carried out for mixed convection about inclined surfaces in a saturated porous media incorporating the variation of permeability and thermal conductivity due to packing of particles. Similarity solutions ...
  • Observations of the giant H II region complex W51 at decameter wavelengths 
    Deshpande, A. A; Sastry, Ch. V (European Southern Observatory, 1986-05)
    Radio continuum absorption observations at 34.5 MHz with a spatial resolution of 34 x 48 arcmin have been obtained for the giant H II region complex W 51 with the decameter-wave radio telescope at Gauribidanur, India (13 ...
  • CA II K bright points and the solar cycle 
    Sivaraman, K. R (Springer, 1984-09)
    We have made number counts of the bright points that populate the interior of the Ca II network in the solar chromosphere for four solar cycles. We find that the number of these fine structures during the solar maximum ...

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