Kodaikanal Observatory Bulletins (1905 - 1997 ): Recent submissions

  • Relativistic effects on Radiative Transfer Equation: Order of Magnitude study 
    Peraiah, A (Indian Institute of Astrophysics, Banglore, 1986-05)
    We have analyzed how the high gas velocities which are observed in the objects such as the atmospheres of supergiant stars, novae, supernovae, accretion discs around high density objects (like black holes, neutron stars ...
  • Integral Operator Technique of Line Transfer 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1986-05)
    We present details of a new technique of obtaining a numerical solution of the radiative transfer equation in spherical symmetry in a polychromatic system. We employed the integral operators together with an interpolation ...
  • Discretization of the equation of Radiative Transfer with Compton Scattering 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1986-05)
    We have attempted to solve the equation of radiative transfer by including Compton and inverse Compton scattering. We expanded the specific intensity by Taylor series at about v/sup1/ = v/sub0/. The resulting equation has ...
  • P Cygni type profiles 
    Peraiah, A; Srinivasa Rao, M (Indian Institute of Astrophysics, Bangalore, 1985-11)
    We have presented a series of P Cygni type profiles of special lines computed by employing different velocity laws of expansion in a spherically atmosphere. A comparison has been made with those of Beals classification. ...
  • A Computer Controlled Microdensitometer 
    Ananth, A. V (Indian Institute of Astrophysics, Bangalore, 1985-11)
    The paper describes an interface as well as appliaction program developed for logging of digital data from a Carl Zeiss Microdensitometer on the TDC-316 Computer. This has been developed to meet certain requirements of ...
  • Broad Band Photometry of the Solar Corona of 1983, June 11 
    Sivaraman, K. R; Singh, J; Kapoor, R. C; Kariyappa, R (Indian Institute of Astrophysics, Bangalore, 1985-11)
    The solar corona was photographed at an effective wavelength of 6300A during the total eclipse of 1983, June 11 at Indonesia. From the isophotes of the corona, the intensity distributions along the equator, poles, streamers ...
  • A Fast Optical Pulse Counting system for Crab Pulsar 
    Santhanam, P; Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1985-11)
    A sub millisecond resolution counting system for recording shapes of short periodic pulses is described. Results obtained in recording the shape of optical pulses from Crab pulsar are given here. The flexibility of the ...
  • A System for Recording Phase Path Variations of Ionospheric Reflections 
    Sastri, J. H; Ramesh, K. B; Ramamoorthy, K. S (Indian Institute of Astrophysics, Bangalore, 1985-11)
    An experimental set-up developed for continuous recording of the phase path variations of reflections at normal incidence from discrete regions of the terrestrial ionosphere is described. Salient features of the system ...
  • A Survey of Red Stars in the Direction of the Large Magellanic Cloud. III. Some Regions North of Bar 
    Bappu, M. K. V; Parthasarathy, M; Scaria, K. K (Indian Institute of Astrophysics, Bangalore, 1985-11)
    We have continued the survey for red stars in the direction of the Large Magellanic Cloud using the technique of ultra-low dispersion spectroscopy. In this paper we list 310 red stars located north of L M C bar. Finding ...
  • Observations on the Fine Structures in Solar Decametric Radio Emission 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V (Indian Institute of Astrophysics, Bangalore, 1984)
    The Solar decametric radio emission consists of a variety of fine structures. This reflects the complexity of the corona at this level. Two observations, viz. absorption bursts and short duration narrow band bursts are ...
  • Modelling of Plasma Structures in the Solar Atmosphere 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1984)
    A maximal helicity principle is proposed to study the stability of plasma structures in the solar atmosphere. This principle derives from the statistical treatment of the magnetohydrodynamical turbulence. The steady state ...
  • Vector Magnetic Field in Prominences: Observations and Analysis 
    Smartt, R. N; House, L. L (Indian Institute of Astrophysics, Bangalore, 1984)
    Measurements of the polarization of the He I D3 multiplet in a prominence allow the magnetic fields associated with the prominence to be deduced. The amount and angle of the linear polarization are governed by the Hanle ...
  • Solar Dynamo Problem 
    Gokhale, M. H (Indian Institute of Astrophysics, Banglore, 1984)
    The origin of solar magnetic field and the flux tube nature of this field on the smallest observed scales are two key problems in solar magnetohydrodynamics. Despite the sucess of kinematical models based on the turbulent ...
  • Convection and the Phenomenon of Kilogauss Magnetic Fields on the Sun 
    Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1984)
    The role played by convection in the formation of slender magnetic flux tubes and in the dynamics of the gas within the tube is discussed in the case of simplified models. Convection instability cannot drive systematic ...
  • Observations of the Evershed effect - Past and Present 
    Sivaraman, K. R (Indian Institute of Astrophysics, Bangalore, 1984)
  • Line Asymmetry and Magnetic Fields 
    Livingston, William (Indian Institute of Astrophysics, Bangalore, 1984)
    The measurement of the asymmetries of Fraunhofer lines shows promise as a diagnostic of convection at the surface layers of the Sun and Stars. We discuss today the observational evidence that the asymmetry, and by inference ...
  • The Rotation of the Sun from Mount Wilson Sunspot Mesurements 
    Howard, Robert; Gilman, Peter (Indian Institute of Astrophysics, Bangalore, 1984)
  • Limb Darkening due to the Incidence of a Parallel Beam of Radiation 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1983)
    We have investigated how the radiation is distributed from the centre to the limb when the atmosphere receives a parallel beam of radiation from infinity. We have considered a purely reflecting surface at the bottom of the ...
  • Numerical Evaluation of Spherical Bessel and Related Functions 
    Shah, G. A (Indian Institute of Astrophysics, Bangalore, 1983)
    Techniques for calculating the spherical Bessel functions of complex argument lying in any quadrant of the z-plane and arbitary orders have been developed. The method applies to real, pure imaginary or complex arguments. ...
  • The Absolute Magnitudes of Wolf-Rayet Stars HD 151932 and HD 152270 
    Shylaja, B. S; Bappu, M. K. V (Indian Institute of Astrophysics, Bangalore, 1983)
    The absolute visual magnitudes of two Wolf-Rayet stars HD 151932 (WN 7) and HD 152270 (WC 7+08) have been determined from their energy distributions and monochromatic magnitudes least contaminated by emission lines taking ...

Search DSpace


Browse

My Account