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Browsing by Subject "Computational astrophysics"

Browsing by Subject "Computational astrophysics"

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  • Aberration and advection effects in a plane-parallel medium in motion 
    Peraiah, A (American Astronomical Society, 1987-06)
    The effects of aberration and advection terms in the fluid-frame steady-state radiative-transfer equation are evaluated by means of numerical computations for plane-parallel media moving at velocities 1000, 2000, 3000, ...
  • Aberration and advection effects in expanding spherically symmetric shells 
    Peraiah, A (American Astronomical Society, 1991-04)
    The extreme outer layers of supernovae, novae, AGN, QSOs, and many supergiant stars are known to be in rapid expansion or contraction. In this paper, aberration and advection effects in a spherical medium scattering radiation ...
  • CN 1-1 - A peculiar compact planetary nebula 
    Bhatt, H. C; Mallik, D. C. V (The European Southern Observatory, 1986-11)
    Cn 1-1 is an emission-line object that shows strong emission lines characteristic of high density planetary nebulae superposed on the stellar spectrum of an F5 III-IV star. The authors estimate the absolute luminosity of ...
  • Comparison of computed fluxes for Fe X and Fe XIV lines with observed values at 1980 eclipse 
    Raju, P. K; Singh, J (Kluwer Academic Publishers, 1987-09)
    Fluxes have been computed for Fex (6374 Å) and Fe xiv (5303 Å) lines as a function of solar radii and at various coronal tempratures. The electron density derived from the white light corona during the total solar eclipse ...
  • Effect of Lyman radiation transfer on the formation of the H-alpha line in supergiant chromospheres 
    Mallik, S. G. V; Mallik, D. C. V; Mohan Rao, D (European Southern Observatory, 1991-03)
    The paper pesents radiative transfer calculations of the H-alpha line in spherically expanding chromospheres of late-type supergiants where the assumption of radiative detailed balance in Lyman transitions has been relaxed. ...
  • 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 ...
  • 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 ...
  • Equivalent widths of hydrogen Lyman alpha line in an expanding spherical atmosphere 
    Peraiah, A; Ingalgi, M. F (Indian Academy of Sciences, 1990-06)
    The profiles of hydrogen Lyman-alpha line in an expanding spherical atmosphere containing dust and gas were calculated. The variation of equivalent widths with velocities of expansion of the atmosphere, together with the ...
  • Expanding chromospheres of late G and K supergiants 
    Mallik, S. G. V (Royal Astronomical Society, 1986-09)
    The radiative transfer problem in non-LTE moving atmospheres has been explicitly solved for Hα line profiles. These computations have been done for a schematic model of the line-forming region over a wide range of optical ...
  • On the tidal disruption of a spherical galaxy 
    Namboodiri, P. M. S; Kochhar, R. K (Blackwell Publishing, 1991-12)
    The disruption of a satellite galaxy as it undergoes collision with a massive perturber is investigated by numerical simulations. The models are restricted by a constant pericentric distance. The disruption of the satellite ...
  • 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 ...
  • The role of Compton and Raman scattering in the quasar continuum 
    Gangadhara, R. T; Krishan, V (Blackwell Publishing, 1992-05)
    There are three ways in which an electromagnetic wave can undergo scattering in a plasma: (1) when the scattering of radiation occurs by a single electron, it is called Compton Scattering; (2) if it occurs by a longitudinal ...
  • Tidal change in the energy of a spherical galaxy 
    Namboodiri, P. M. S; Kochhar, R. K (Royal Astronomical Society, 1990-03)
    Tidal effects of a massive perturber on a satellite galaxy have been studied by numerical simulations. The model consists of a spherical satellite galaxy and a point-mass perturber and the encounter is non-penetrating. A ...
  • The variation of photospheric active regions in HD 127535 
    Mekkaden, M. V; Geyer, E. H (European Southern Observatory, 1988-04)
    UBVRI photometry of the chromospherically active star HD 127535 obtained during April 1987 is presented. The analysis shows that the light variation is quasi-sinusoidal and the amplitude and the phase of the light minimum ...

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