We studied the influence of high veolcities of expansion on resonance line radiation by taking into account of aberration and advection. We used an angle averaged redistribution function RII in...
We studied the effects of irradiation on the line formation in the expanding atmospheres of the components of close binary systems. We considered a two-level atom approximation in Non-LTE situation....
Compton Broadening Due To Electron Scattering (1993)
We have investigated the effects of Compton broadening due to electron scattering in the hot stellar atmosphere, quasars, AGN's etc. We considered a purely electron scattering media. The Compton...
Polarization in binaries (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...
A study is made of the effects of the presence of dust and radial expansion of the spherical shells around stars on the equivalent widths of the lines formed in such shells. A non-LTE, two-level atom...
Radiation trensfer in fast moving fluids (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...
Some physical processes influencing the polarization of continuum and line radiation (1987)
Some physical mechanisms which affect the continuum and line polarization are studied. The physical conditions of the plasma selected for this purpose represent different astrophysical situations of...
Integration of the radiative transfer equation, with the aberration and advection terms included, is described, assuming coherent and isotropic scattering. The operators of transmission and...
A formal solution of equation transfer with aberration and advection terms is developed for spectral lines taking into consideration partial redistribution of photon in a spherical medium which is...
A formal solution of the equation of radiative transfer is presented with aberration and advection terms corresponding to the lines included. The operators of reflection and transmission in a...
Discretization of the equation of Radiative Transfer with Compton Scattering (1986)
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...
Integral Operator Technique of Line Transfer (1986)
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...
Line Profiles in an Expanding Spherical Medium (1986)
Peraiah, A, Srinivasa Rao, M, Varghese, B. A
We have applied the discrete space theory of radiative with the integral operator technique to calculate the spectral line profiles formed in a spherically symmetric expanding stellar atmospheres. We...
Some aspects of the solution of vector transfer equation in a magnetized medium (1985)
A simplification of the numerical method of solving the vector transfer equation, given earlier by Nagendra and Peraiah (1985), is described for problems which involve only absorption. This makes it...
Numerical solution of the radiative transfer equation in a magnetized medium (1985)
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...
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...
Polarization of continuum radiation in magnetic atmospheres (1984)
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...
Simultaneous solutions of the radiative transfer equation in the comoving frame and the statistical equilibrium equation, for a non-LTE two-level atom, have been obtained by means of angle-averaged...
Limb Darkening due to the Incidence of a Parallel Beam of Radiation (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...
Effects of Velocities on Ca II H and K Lines (1981)
Rangarajan, K. E, Mohan Rao, D, Peraiah, A
Ca II H and K (3968, 3933) and infrared triplet lines lamda lamda lamda 8498, 8662, 8542 were calculated in a very slowly expanding medium. Five level atom with continuum was considered. Radiative...
Formation of Spectral Lines with the Redistribution Function R1 along the line of Sight (1981)
We studied the formation of spectral lines at infinity with the redistribution function R1. The radial optical depths considered are 5, 5, 10, 50 and 100. A linear law of velocity is assumed in these...
Transient Solution of Equations of Hydrodynamics in Gas Clouds (1981)
We have presented numerical results of transient phenomenon in incompressible fluids. This has been obtained by solving the equations of conservation of momentum, energy and mass in X and Y geometry....
Peraiah, A, Raghunath, G, Nagendra, K. N
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...
Complete redistribution with Voigt profile function has been employed in obtaining the simultaneous solution of line transfer and the statistical equilibrium equation for a non-LTE two level atom in...
Rotational Effects on line Source Function (1980)
The effects of rotation are investigated on the source functions in an expanding atmosphere. We have considered a non-LTE two-level atom in an extended atmosphere. We have also made use of von...
Lines Formed in Slowly Expanding Thin Spherical Shell (1980)
Peraiah, A, Raghunath, G, Nagendra, K. N
We have investigated how an optically thin spherical shell with small velocities change the profiles and equivalent widths of the lines. We have employed several types of variations in density,...
Fluxvector Splitting of the Inviscid Radiation Gas Dynamic Equations (1980)
We have analysed various schemes for the iterative simultaneous solution of the inviscid gas dynamic equations. We have considered the problem from the point of view of the stellar atmospheres. The...