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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Nova V4444 Sagittarii 1999 in the early decline and quiescent phases 
    Kamath, U. S; Ashok, N. M; Anupama, G. C (Astronomical Society of India, 2008-12)
    We present near-infrared and optical spectra of the fast nova V4444 Sagittarii at two single epochs in the early decline phase and unfiltered images obtained in quiescence. Based on this and other available data, we discuss ...
  • A Novel Approach to Reduce Optical Aberrations by using Deformable Bushes at Opto-Mechanical Interfaces 
    Nagabhushana, S; Nagesh, Suresh; Prasad, B. R (World Scientific, 2021-06)
    There is a continuous need to enhance the aperture size of telescopes by astronomers to explore the space much deeper by getting better resolutions and high image quality. Supporting large optics and maintaining high ...
  • A novel probe of ionized bubble shape and size statistics of the epoch of reionization using the contour Minkowski tensor 
    Akanksha, K; Pravabati, C; Appleby, S; Park, C (IOP Publishing, 2018-10)
    We employ the rank-2 contour Minkowski tensor in two dimensions to probe length and time scales of ionized bubbles during the epoch of reionization. We demonstrate that ionized bubbles are not circular, and hence not ...
  • Now that comet halley is out of hiding 
    Sivaraman, K. R (Nehru Centre, 1985-12)
  • NU Centauri: A New Beta Cephei Star 
    Rajamohan, R (Indian Institute of Astrophysics, Bangalore, 1977)
    Spectroscopic observations of the single-lined binary, NU Centauri during the years 1968-1972 were utilised to derive fresh orbital elements of this system. The measured radial velocities indicate that the primary component ...
  • Nuclear activity and supernova occurrence 
    Kochhar, R. K (Indian Academy of Sciences, 1985)
    It is argued that the occurrence of nuclear activity and supernovae in E and S0 galaxies are correlated and a result of accretion of gas by the galaxy.
  • Nuclear detonation around compact objects 
    Sivaram, C; Arun, K; Kiren, O. V (Science Publications, 2014)
    In this study we explore the various aspects involved in nuclear detonations occurring around compact objects and the energetics involved. We discuss the possibility of sub-Chandrasekhar white dwarfs detonating due to the ...
  • Nuclear matter in the derivative scalar coupling model. Energy per nucleon and a finite temperature equation of state 
    Datta, B; Sahu, P. K (Elsevier Science B.V., 1993-12-02)
    We calculate an equation of state of nuclear matter based on the derivative scalar coupling model proposed by Zimanyi and Moszkowski, using improved values of the saturation density and binding energy. Comparison of this ...
  • Nuclear structure effects in parity non-conservation in heavy ions 
    Panda, P. K; Das, B. P (Indian Association for the Cultivation of Science, 2010-07)
    We calculate the binding energy, charge radii in ,129Ba-143Ba and 214Ra-228Ra using the relativistic mean field theory which includes scalar and vector mesons. We then evaluate the nuclear structure corrections to the ...
  • Nuclear-spin-dependent parity-nonconserving transitions in Ba/sup+ and Ra/sup+ 
    Geetha, K. P; Singh, A. D; Das, B. P; Unnikrishnan, C. S (The American Physical Society, 1998-07)
    An experiment to observe parity nonconservation using the \|5p/Sup66s>1/2-->\|5p/Sup65d>3/ 2 transition in Ba/Sup +has been proposed [N. Fortson, Phys. Rev. Lett., 70, 2383 (1993)]. We have carried out relativistic ...
  • Nucleus of NGC 2903 
    Prabhu, T. P (D.Reidel Publishing Co.,, 1980-04)
    The nucleus of NGC 2903 is identified on near infrared photographs. The energy distribution of this nucleus in the visual region of the spectrum is estimated from available observations. The continuum compares well with ...
  • Numerical Evaluation of Spherical Bessel and Related Functions 
    Shah, G. A (Indian Institute of Astrophysics, Bangalore, 1983)
    Techniques for calculating the spherical Bessel functions of complex argument lying in any quadrant of the z-plane and arbitary orders have been developed. The method applies to real, pure imaginary or complex arguments. ...
  • Numerical Methods for Mie Theory of Scattering by a Sphere 
    Shah, G. A (Indian Institute of Astrophysics, Bangalore, 1977)
    A new procedure for evaluating the basic quantities connected with the Mie theory of scattering by a sphere is presented. Some independent numerical techniques are developed to enable one to achieve the desired accuracy. ...
  • Numerical Methods for Solving the Polarized Line Transfer Equations with Partial Frequency Redistribution 
    Nagendra, K. N; Frisch, H; Fluri, D. M (Astronomical Society of the Pacific, 2003)
    In this paper we present brief review on Polarized Approximate Lamda Iteration (PALI) line radiative transfer method, for solving the Hanle effect line formation problem with Angle Averaged (AA) partial frequency redistribution. ...
  • Numerical methods in polarized line formation theory 
    Nagendra, K. N; Sampoorna, M (Astronomical Society of the Pacific, 2009-06)
    We review some numerical methods and provide benchmark solutions for the polarized line formation theory with partial redistribution (PRD) in the presence of magnetic fields. The transfer equation remains non-axisymmetric ...
  • Numerical Simulation of Wave Propagation in Magnetic Network 
    Vigeesh, G; Hasan, S. S; Steiner, O (Cambridge University Press, 2009-03)
    We present 2-D numerical simulations of wave propagation in the magnetic network. The network is modelled as consisting of individual magnetic flux sheets located in intergranular lanes. They have a typical horizontal size ...
  • A numerical solution of the line transfer equation in a spherically symmetric atmosphere. 
    Mohan Rao, D (Elsevier B. V, 1999-05)
    A numerical solution based on finite differences is proposed for solving the line transfer equation in a spherically symmetric atmosphere. The author discretizes the curvature term in the equation by the backward difference ...
  • 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 ...
  • Numerical Solutions of Polarized Line Transfer Equations 
    Nagendra, K. N (Astronomical Society of the Pacific, 2003)
    Recent developments in the NLTE polarized line formation theory in Astrophysics is discussed. Attention is focussed on pure theoretical aspects of the problem. A conventional method of solving the line transfer equation ...
  • A Numerical Survey of Neutron Star Crustal Density Profiles 
    Datta, B; Thampan, A. V; Bhattacharya, D (Indian Academy of Sciences, 1995-12)
    An accurate numerical survey of the density profiles corresponding to the crusts of neutron stars for representative equation of state models is presented. This will find application in calculations of thermal and magnetic ...

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