IIAP Publications: Recent submissions

  • Inhibition of convective collapse of solar magnetic flux tubes by radiative diffusion 
    Venkatakrishnan, P (Nature Publishing Group, 1986-07)
    Proctor and Weiss (1982) have indicated that the interaction of convection with a magnetic field leads to an intermittent distribution of magnetic flux. Such a process can lead to 'equipartition fields' of 700 G which ...
  • Radiative transfer equation in spherical symmetry 
    Peraiah, A; Varghese, B. A (American Astronomical Society, 1985-03)
    A numerical solution of the radiative transfer equation in spherically symmetric geometry is presented using integral operators within the framework of the discrete space theory and expressing the specific intensity in ...
  • Flares on AM Canum Venaticorum 
    Marar, T. M. K; Padmini, V. N; Seetha, S; Narayanan Kutty, K. R; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (European Southern Observatory, 1988-01)
    AM CVn, an interacting binary system consisting of two helium white dwarfs, has been classified as a nova-like object. Normally it exhibits only small amplitude modulations of 0.05 mag with a 1051 s periodicity. The authors ...
  • Torsion and the cosmological constant problem 
    de Sabbata, V; Sivaram, C (Springer, 1990-03)
    A promising possibility which has yet to be considered with a view to furthering understanding of the cosmological constant problem is the use of torsion in a framework such as that of Einstein-Cartan theory: as would be ...
  • Maximum entropy method for phase-unstable aperture synthesis 
    Shevgaonkar, R. K (European Southern Observatory, 1986-07)
    An application of the Maximum Entropy Method (MEM) to the closure data is described. It is shown that although the basic principle of the method is to obtain a brightness distribution which has highest entropy, the closure ...
  • The RS Canum Venaticorum binary HD 116204 
    Mohin, S; Raveendran, A. V (Indian Academy of Sciences, 1987-12)
    BV photometry of HD 116204 have been obtained on 57 nights during the 1983-1984, 1984-1985, and 1986-1987 observing seasons with the 34-cm reflector of the Vainu Bappu Observatory in Kavalur. A photometric period of 21.9 ...
  • Spectroscopic evolution of Nova LW Serpentis 1978 during its early decline 
    Prabhu, T. P; Anupama, G. C (Indian Academy of Sciences, 1987-12)
    Spectroscopic observations of Nova LW Serpentis have been obtained in 1978 during its decline from V of about 9.0 to V of about 10.2. It is found that the spectrum and its evolution compare well with those of a typical ...
  • Equilibrium of a thin, isolated, axisymmetric force-free magnetic flux tube in a stratified atmosphere 
    Lakshmi, P; Gokhale, M. H (Kluwer Academic Publishers, 1988-03)
    The equations for equilibrium of a thin, isolated, axisymmetric, and force-free magnetic flux tube are derived, taking into account the inhomogeneities of the magnetic field, plasma pressure, and plasma density over the ...
  • Nebular spectrum of CPD-56 deg 8032 and He2-113 
    Kameswara Rao, N (Royal Astronomical Society, 1987-09)
    The electron density, temperature and ion abundances in the nebulae surrounding the two WC 10 stars CPD-56 deg 8032 and He2-113 have been estimated. In CPD-56 deg 8032 sulphur, nitrogen and oxygen seem to have solar ...
  • Variations in the solar rotation rate derived from Ca(+) K plage areas 
    Singh, J; Prabhu, T. P (Springer, 1985-11)
    Daily calcium plage areas for the period 1951-1981 (which include the solar cycle 19 and 20) have been used to derive the rotation period of the sun at latitude belts 10-15 deg N, 15-20 deg N, 10-15 deg S, and 15-20 deg ...
  • Raman scattering of the synchrotron self-absorbed radiation in accretion discs 
    Krishan, V (Royal Astronomical Society, 1988-01)
    The quasar non-thermal continuum in the radio region can undergo Raman scattering in the accretion disc plasma around the central black hole provided that the frequency and the wave vector matching and the threshold ...
  • Occultations by possible material in Saturn's outer magnetosphere 
    Vasundhara, R (Indian Academy of Sciences, 1988-03)
    Results are presented of a search in the SAO catalogue for occultations of stars by Saturn's magnetosphere occurring during 1988. The instantaneous apparent position of the star, angle of inclination of the ring plane to ...
  • Two-dimensional pressure structure of a coronal loop 
    Krishan, V (Springer, 1985)
    The steady-state pressure structure of a solar coronal loop is discussed using the theory of magnetohydrodynamical turbulence in cylindrical geometry. The steady state is represented by the superposition of two ...
  • Photoelectric and electronographic photometry of the globular cluster NGC 1851 
    Sagar, R; Cannon, R. D; Hawkins, M. R. S (Royal Astronomical Society, 1988-05)
    The colour-magnitude diagram for NGC 1851 is presented to a limit of V = 21.0 mag, approximately 2 mag below the main-sequence turn-off point, on the basis of UBV photoelectric photometry and electronographic BV photometry. ...
  • Effects of capillary waves on the thickness of wetting layers 
    Chatterjee, S; Gopal, E. S. R (EDP Sciences, 1988-04)
    The free energy contribution of capillary waves is calculated to show its significant dependence on the thickness of the liquid layer, when the thickness is very small. It is shown that these oscillations can play an ...
  • 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 ...

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