IIA Institutional Repository

Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Effective coherence length estimation of optical wavefronts 
    Vyas, A; Roopashree, M. B; Prasad, B. R (Central Scientific Instruments Organisation (CSIR), 2009-11)
    In adaptive optics, the measurement of spatial coherence length helps in deciding the optimum design parameters of a Shack Hartmann Sensor (SHS). Two methods of estimating the spatial coherence length of optical wavefronts ...
  • The effects of aberration and advection in plane-parallel and absorbing media 
    Peraiah, A (Springer, 1989-09)
    We have calculated the changes that would occur in mean intensity due to the presence of aberration and advection terms in radiative transfer equation. We have considered an absorbing medium with velocities 1000, 2000, ...
  • Effects of aberration and advection on line formation 
    Peraiah, A (University of Chicago Press, 1991-10)
    The effects of inclusion of the aberration and advection terms in the equation of the line transfer are studied. Spherical shells whose ratios of outer (B) to inner (A) radii (B/A) are 2, 5, and 10 and with line-center ...
  • Effects of aberration and advection on partial frequency redistribution of photon in spectral line formation 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1989)
    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 expanding with a radial ...
  • Effects of angle-dependent partial frequency redistrubtion on polarized line profiles 
    Sampoorna, M; Nagendra, K. N; Frisch, H; Stenflo, J. O (Astronomical Society of the Pacific, 2019-07)
    Scattering of solar limb darkened radiation field on atoms and molecules produces linearly polarized spectrum of the sun (Second Solar Spectrum). Partial frequency redistribution (PFR) plays a fundamental role in shaping ...
  • 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 ...
  • Effects of dark matter in red giants 
    Clea, Sunny; Sivaram, C; Gudennavar, S. B (Elsevier B. V., 2020-12)
    Dark matter (DM) which constitutes five-sixths of all matter is hypothesized to be a weakly interacting non-baryonic particle, created in the early stages of cosmic evolution. It can affect various cosmic structures in the ...
  • Effects of dark matter in star formation 
    Arun, K; Gudennavar, S; Prasad, A; Sivaram, C (Springer, 2019-02)
    The standard model for the formation of structure assumes that there existed small fluctuations in the early universe that grew due to gravitational instability. The origins of these fluctuations are as yet unclear. In ...
  • Effects of dark matter on the upper bound mass of neutron stars 
    Kumar, S. S; Kenath, A; Sivaram, C (Elsevier B.V, 2020-05)
    Observations have indicated that we do not see neutron stars (NS) of mass near the theoretical upper limit as predicted. Here we invoke the role of dark matter (DM) particles in star formation, and their role in lowering ...
  • Effects of Dust in Distorted, Irradiated, and Expanding Atmospheres of Close Binary Components 
    Srinivasa Rao, M (Astronomical Society of Japan, 2003)
    We studied the transfer of line radiation with dust in distorted and expanding atmospheres of close binary components. We assumed that the distortion of the atmosphere is caused by self rotation and a tidal force exerted ...
  • Effects of dust on the formation of lines in an expanding spherical medium 
    Peraiah, A; Varghese, B. A; Srinivasa Rao, M (The European Southern Observatory, 1987-06)
    A series of line profiles formed in a spherically symmetric and radially expanding atmosphere in which dust is present are computed, assuming that the dust scatters radiation isotropically. Two cases of dust distribution ...
  • Effects of dust scattering in expanding spherical nebulae 
    Srinivasa Rao, M; Sengupta, S (Elsevier B. V., 2004-03)
    The mean intensity of planetary nebulae with an expanding atmosphere is modeled by considering dusty and dust-free atmospheres. The bulk matter density is determined from the adopted velocity field through the equation of ...
  • The effects of electron scattering on the Si II 1816 line in the solar chromosphere 
    Rangarajan, K. E; Rao, D. M (Springer-Verlag, 1991)
    We have considered the formation of Si II 1816 line in the solar chromosphere. The VAL model has been adopted as the input for the electron density and temperature. These preliminary calculations show that there are ...
  • Effects of high radial velocities on line transfer in extended atmospheres 
    Peraiah, A (Copernicus Foundation for Polish Academy, 1980)
    The equation of radiative transfer in a comoving frame has been solved for rapidly expanding gaseous medium in spherically symmetric extended stellar atmospheres. A non-LTE two-level atom with Voigt profile function is ...
  • Effects of High Velocities on Photoionization Lines 
    Peraiah, A; Raghunath, G (Indian Academy of Sciences, 1980)
    We have treated formation of spectral lines in a commoving frame where photoionization is predominant over collisional processes. We have assumed that the radiation field for causing photoionization is a function of Planck ...
  • Effects of magnetic shear, spot, and plage rotation on prominence evolution 
    Rausaria, R. R; Gupta, S. S; Selvendran, R; Raman, K. S; Singh, J (Kluwer Academic Publishers, 1993-08)
    We have studied the evolution of two dark H-alpha filaments as prominences during their disk passage from February 12 to February 19, 1992 and from March 6 to March 17, 1992, using Kodaikanal Observatory H-alpha and Ca II ...
  • Effects of modified gravity on microscopic properties and cooling timescale of white dwarfs 
    Wojnar, Aneta; Kalita, Surajit; Sarmah, Lupamudra (Elsevier B.V, 2024-03)
    There are currently two open questions in white dwarf physics: why are massive dwarfs observed less often in astronomical surveys, and why have not any super-Chandrasekhar white dwarfs been found despite the discovery of ...
  • The effects of non-coherent electron scattering on spectral line formation 
    Rangarajan, K. E; Mohan Rao, D; Peraiah, A (Royal Astronomical Society, 1991-06)
    Spectral line profiles from a plane-parallel homogeneous atmosphere have been calculated for the complete and partial redistribution mechanisms (CRD and PRD) including coherent and noncoherent electron scattering. It is ...
  • Effects of nuclear structure on parity nonconservation in atomic cesium in relativistic mean field theory 
    Panda, P. K; Das, B. P (The American Physical Society, 2000-12)
    We use relativistic mean field theory, which includes scalar and vector mesons, to calculate the binding energy and charge radii in 125Cs-139Cs. We then evaluate the nuclear structure corrections to the weak charges for a ...
  • Effects of partial frequency redistribution functions R(II), R(III) and R(V) on source functions 
    Mohan Rao, D; Rangarajan, K. E; Peraiah, A (Indian Academy of Sciences, 1984-06)
    The effects of partial frequency redistribution on the formation of spectral lines have been studied. The angle-averaged R(II), R(III) and R(V) types of redistribution with isotropic phase function have been considered. ...

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