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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Radiation Flux in Sunspot Umbrae 
    Ramanathan, A. S (Springer-Verlag, 1954)
    The ratio of umbral intensity to photospheric intensity as a function of wavelength has been studied in the case of four fairly large spots in the wavelength range 4000A - 6500A. The relative spectrophotometric gradient ...
  • Radiation from an electron beam-magnetoplasma 
    Krishan, V (Institute of Physics, 1980-08)
    The possibility of direct generation of electromagnetic radiation at and near electron plasma frequency from an electron beam-magnetoplasma system is explored. The role of the electron beam is replaced by the electron ...
  • Radiation of the fifth-force field 
    Bertotti, B; Sivaram, C (Springer, 1991-11)
    The «fifth-force» field, if it exists, has radiative effects in competition with the gravitational radiation. Since this field violates the Principle of Equivalence, it may affect a gravitational wave detector more than a ...
  • 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 ...
  • Radiative Capture of Polarized Neutrons by Polarized Protons 
    Ramachandran, G; Deepak, P. N (World Scientific Publishing, 2004-06)
    A model-independent irreducible tensor approach is presented for the np fusion reaction. Appropriate spin-observables are identified to determine empirically the initial spin singlet and triplet contributions to the ...
  • Radiative neutrino decay in hot media 
    Nieves, J. F; Pal, P. B (The American Physical Society, 1997-07)
    We calculate the rate for the radiative neutrino decay in a thermal background of electrons and photons, taking into account the effect of the stimulated emission of photons in the thermal bath. We show that the rate is ...
  • A Radiative Transfer Calculation Using R(III) in an Expanding Spherically Symmetric Stellar Atmosphere 
    Singh, P (Royal Astronomical Society, 1994-07)
    With the availability of very high-resolution stellar spectra, even small differences between line profiles resulting from complete redistribution and partial frequency redistribution may be important in the quantitative ...
  • Radiative Transfer Effects and Convective Collapse: Size(flux)-Strength Distribution for the Small-Scale Solar Magnetic Flux Tubes 
    Rajaguru, S. P; Hasan, S. S (Astronomical Society of the Pacific, 1999)
    The effects of radiative energy exchange on the convective instability of a weak field magnetic structure, which lead to a prediction and a physical explanation of the magnetic flux dependent field strength, are examined ...
  • Radiative Transfer Effects and the Dynamics of Small-Scale Magnetic Structures on the Sun 
    Rajaguru, S. P; Hasan, S. S (The American Astronomical Society, 2000-11)
    The dynamical consequences of radiative energy transport on the evolution of gas confined to small-scale magnetic structures on the Sun are studied. Convective collapse, which transforms weak-field structures into intense ...
  • Radiative transfer effects due to curvature and expansion in a dusty planetary nebulae 
    Peraiah, A (International Astronomical Union, 1983)
  • Radiative transfer effects in rotationally distorted stars 
    Srinivasa Rao, M (Royal Astronomical Society, 2005-03)
    A general expression for the gravity darkening of the tidally and non-uniformly rotating Roche components of close binary systems is used to calculate the uniform rotational effects on line profiles in an expanding atmosphere. ...
  • 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 Modelling of Dust in IRAS 18333–2357: The only planetary nebula in the metal-poor globular cluster M22 
    Muthumariappan, C; Parthasarathy, M; Ita, Y (Oxford University Press on behalf of the Royal Astronomical Society, 2013-10-11)
    We report results from our 1-D radiative transfer modelling of dust in the hydrogen-deficient planetary nebula IRAS 18333–2357 located in the globular cluster M22. A spectral energy distribution was constructed from ...
  • Radiative Transfer Modelling of Dust in the M22 PN IRAS 18333-2357 
    Muthumariappan, C; Parthasarathy, M; Ita, Y (Astronomical Society of the Pacific, 2015-08)
    We report results from our 1-D radiative transfer modelling of dust in the hydrogen-deficient planetary nebula IRAS 18333-2357 and discuss the properties of classical-grain and very small-grain populations of this PN.
  • Radiative Transfer Models of Dust Shells Around Post-AGB Stars 
    Surendiranath, R; Parthasarathy, M; Varghese, B. A (Springer, 2002-09)
    We present a radiative transfer analysis of circumstellar dust shells around the Post-AGB stars HD 179821, HD 56126, HD 101584 and early R star HD 100764, using the code DUSTY. Parameters like mass-loss, shell inner radius, ...
  • 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 ...

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