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Browsing by Author "Peraiah, A"

Browsing by Author "Peraiah, A"

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  • Numerical solution of the radiative transfer equation in a magnetized medium 
    Nagendra, K. N; Peraiah, A (Blackwell Publishing, 1985-05)
    A numerical method of solution based on the discrete space theory of radiative transfer as applied to the transfer problems in an anisotropic medium is discussed. Two simple applications, namely the scattering in the ...
  • On negative intensities in discrete space theory in spherical medium 
    Peraiah, A (Indian Institute of Astrophysics, 1978)
    The reasons for the occurrence of negative intensities are discussed. A method is described to obtain positive solution of radiative transfer equation in spherical symmetry in distance space theory by using frequency ...
  • On the Balmer progression in the expanding shell of Pleione 
    Peraiah, A (Indian Academy of Sciences, 1982-09)
    An attempt has been made to explain the Balmer progression in velocities seen in Pleione and other shell stars. Equations of conservation of mass and momentum are simultaneously solved with assumptions which simplify the ...
  • On the coronal lines 5303 A and 6374 A 
    Peraiah, A; Varghese, B. A (Springer, 1989-06)
    Theoretical calculations of the observed coronal emission line profiles of Fe XIV (5303 A) and Fe X (6374 A) ions, which are observed at the time of total solar eclipse, are presented. Baumbach's relation of electron density ...
  • Optical depth effects on the formation of spectral lines in rotating and expanding spherical atmospheres 
    Peraiah, A; Raghunath, G; Nagendra, K. N (Indian Academy of Sciences, 1981)
    The effect of high optical depths and large rotational velocities on the spectral lines in rotating and radial expanding spherical shells is investigated. It is assumed that the outer radius of the shell is three times the ...
  • 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. ...
  • Photon escape probabilities in expanding atmospheres 
    Peraiah, A; Rangarajan, K. E; Mohan Rao, D (Indian Academy of Sciences, 1981-03)
    A comparison of mean number of scatterings and escape probabilities has been made in isotropic scattering and dipole scattering by using the angle-averaged partial frequency redistribution functionR I. We have solved the ...
  • Polarization in binaries 
    Barman, S. K; Peraiah, A (Astronomical Society of India, 1991)
    Theoretical models are computed for estimating linear polarization from the extended dusty outer layers of the components of a close binary system whose surfaces are distorted by rotation and mutual tidal effects. ...
  • Polarization of continuum radiation in magnetic atmospheres 
    Nagendra, K. N; Peraiah, A (Kluwer Academic Publishers, 1984-09)
    A numerical solution is presented for the problem of continuum radiative transfer in a magnetoactive medium. The continuum opacities are calculated in the presence of a strong magnetic field (H = 10 MG) typical of magnetic ...
  • Principles of Invariance in Radiative Transfer 
    Peraiah, A (Kluwer Academic Publishers, 1999-01)
    We have reviewed the principle of invariance, its applications and its usefulness for obtaining the radiation field in semi-infinite and finite atmospheres. Various laws of scattering in dispersive media and the consequent ...
  • Radiation pressure in resonance lines 
    Peraiah, A (Indian Institute of Astrophysics, 1979-11)
    The effects of large scales gas motions on the radiation pressure in a resonance lines are investigated. We have assumed a medium with pure scattering together with emission in the continuum. A linear velocity law is ...
  • Radiation trensfer in fast moving fluids 
    Peraiah, A (Astronomical Society of India, 1990)
    Various factors influencing the formation of spectral lines are described, emphasizing the physics of stellar atmospheres. Broadening mechanisms, photon or partial frequency redistribution, the role of chemical species are ...
  • Radiative transfer effects due to curvature and expansion in a dusty planetary nebulae 
    Peraiah, A (International Astronomical Union, 1983)
  • 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 ...
  • Radiative transfer equation in spherically-symmetric non-scattering media 
    Peraiah, A; Varghese, B. A (D. Reidel Publishing Co., 1984-12)
    The equation of radiative transfer in spherically symmetric shells with arbitrary internal sources is solved. The equation of transfer is integrated on a discrete grid of angle and radius. The size in angle coordinates is ...
  • Radiative transfer in the co-moving frame 
    Peraiah, A (D. Reidel Publishing Co., 1981-06)
    Solution of line-transfer equation in the co-moving frame, obtained on the basis of discrete space theory, has been employed to calculate the lines emerging from a rapidly expanding stellar atmosphere. The solution is found ...
  • Radiative transfer in the distorted and irradiated atmospheres of close binary components 
    Peraiah, A; Srinivasa Rao, M (EDP Sciences, 2002-07)
    We studied the transfer of line radiation in the distorted and expanding atmospheres of close binary components. We assumed that the distortion of the atmosphere is caused by self rotation and tidal force exerted by the ...
  • Radiative transfer in the dusty, irradiated expanding atmospheres of close binary components 
    Srinivasa Rao, M; Peraiah, A (EDP Sciences, 2000-09)
    We studied the formation of lines in the irradiated expanding dusty atmospheres of the components of close binary systems. We considered a two-level atom approximation in Non-LTE situation with complete redistribution. The ...
  • Radiative transfer with Compton scattering in plane parallel geometry 
    Peraiah, A (Indian Academy of Sciences, 1990-06)
    The equation of radiative transfer with Compton scattering is solved. The specific intensity has been expanded by Taylor series with respect to wavelength and the first three terms have been retained in solving the transfer ...
  • Radiative transfer with Compton scattering in spherically symmetric shells 
    Peraiah, A; Varghese, B. A (Astronomical Society of Japan, 1990)
    The radiative transfer equation with Compton scattering is solved for spherically symmetric shells. The purpose of the study is to determine how gamma rays or X-rays change their energies and how they become reflected and ...

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