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Browsing IIAP Publications by Title

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  • Exact solution of the incompressible Hall magnetohydrodynamics 
    Mahajan, S. M; Krishan, V (Royal Astronomical Society, 2005-05)
    The Alfvén wave is known to be an exact solution of the ideal magnetohydrodynamics (MHD), and this has found use in modelling astrophysical turbulence. In this paper we show that the Hall MHD also submits itself to an exact ...
  • An excess of mid-infrared emission from the type Iax SN 2014dt 
    Fox, O. D; Johansson, J; Kasliwal, M; Andrews, J; Bally, J; Bond, H. E; Boyer, M. L; Gehrz, R. D; Helou, G; Hsiao, E. Y; Masci, F. J; Parthasarathy, M; Smith, N; Tinyanont, S; Van Dyk, S. D (IOP Publishing, 2016-01)
    Supernovae Type Iax ( SNe Iax ) are less energetic and less luminous than typical thermonuclear explosions. A suggested explanation for the observed characteristics of this subclass is a binary progenitor system ...
  • Excitation energies and oscillator strengths of CaI using multireference many-body perturbation theory 
    Majumder, S; Das, B. P; Chaudhuri, R. K (The American Physical Society, 1999-05)
    Excitation energies and oscillator strengths of neutral calcium (Ca I) are calculated through third order using a variant of the multireference many-body perturbation theory, known as the effective valence-shell Hamiltonian ...
  • Excitation Mechanism of O i Lines in Herbig Ae/Be Stars 
    Mathew, v; Manoj, P; Narang, Mayank; Banerjee, D. P. K; Pratheeksha Nayak; Muneer, S; Vig, S; Kumar, S. P; Paul, K. T; Maheswar, G (IOP Publishing, 2018-04-10)
    We have investigated the role of a few prominent excitation mechanisms viz. collisional excitation, recombination, continuum fluorescence, and Lyman beta fluorescence on the O i line spectra in Herbig Ae/Be stars. The aim ...
  • Excitation of high-m tearing modes at the solar flare site 
    Krishan, V (D. Reidel Publishing Company, 1982-10)
    It is shown that high-m drift tearing modes can be excited under the conditions prevalent at the solar flare sites. Since the growth rate of the high-m tearing modes is larger than that for low-m macroscopic tearing modes ...
  • Excitation of Longitudinal Modes in Solar Magnetic Flux Tubes by p-Modes 
    Hasan, S. S; Kalkofen, W (Astronomical Society of the Pacific, 1998)
    This is a continuation of earlier work by Hasan (1997) on the interaction of longitudinal (sausage) waves in a slender flux tube with p-modes in the ambient medium. We use a realistic stratification for the flux tube and ...
  • Excitation of Oscillations in Photospheric Flux Tubes through Buffeting by External Granules 
    Hasan, S. S; Kalkofen, W (The American Astronomical Society, 1999-07)
    We examine the excitation of transverse (kink) and longitudinal (sausage) waves in magnetic flux tubes by granules in the solar photosphere. The investigation is motivated by the interpretation of network oscillations in ...
  • Excitation of Oscillations in the Magnetic Network on the Sun 
    Hasan, S. S; Kalkofen, W; van Ballegooijen, A. A (The American Astronomical Society, 2000-05)
    We examine the excitation of oscillations in the magnetic network of the Sun through the footpoint motion of photospheric magnetic flux tubes located in intergranular lanes. The motion is derived from a time series of ...
  • Excitation of vertical breathing motion in disc galaxies by tidally-induced spirals in fly-by interactions 
    Kumar, Ankit; Ghosh, Soumavo; Kataria, Sandeep Kumar; Mousumi Das; Debattista, Victor P (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    It is now clear that the stars in the Solar neighbourhood display large-scale coherent vertical breathing motions. At the same time, Milky Way-like galaxies experience tidal interactions with satellites/companions during ...
  • Existence of Nanoparticle Dust Grains in the Inner Solar Corona? 
    Singh, J; Sakurai, T; Ichimoto, K; Hagino, M; Yamamoto, T. T (The American Astronomical Society, 2004-06)
    Motivated by the recent paper by Habbal et al., we have made spectroscopic observations in the wavelength range of 1072.8-1079.0 nm of the solar corona above the coronal hole region on several days using a coronagraph. We ...
  • EXOSAT observations of the Be/X-ray binaries 2S0114+65 and 4U2206+54 
    Saraswat, P; Apparao, K. M. V (International Astronomical Union, 1994)
  • EXOSAT observations of the broad-line radio galaxy 3C 382 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago Press, 1992-04)
    Results are presented of numerous X-ray observations of the broad-line radio galaxy 3C 382 carried out with Exosat between 1983 and 1985, with emphasis on a major outburst of this galaxy in 1985. During the outburst, both ...
  • EXOSAT observations of the Seyfert 1 galaxy NGC 3516 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago press, 1991-12)
    This study presents results of the X-ray spectra (0.1-10 keV) of the Seyfert galaxy NGC 3516 on the basis of Exosat observations obtained on four epochs between 1985/308 and 1985/340. The soft X-ray (0.2-2 keV) flux of ...
  • 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 ...
  • Expanding shell and P Cygni profiles of 27 Canis Majoris 
    Ghosh, K. K (American Astronomical Society, 1990-09)
    H-alpha and He I profiles of 27 CMa obtained between January 1985 and February 1989 are presented. Velocities of blue absorption and red emission components of H-alpha were different from that of He I, suggesting that the ...
  • Expected performances of a Laue lens made with bent crystals 
    Virgilli, Enrico; Valsan, V; Frontera, Filippo; Caroli, Ezio; Liccardo, Vincenzo; Stephen, John Buchan (SPIE-The International Society for Optical Engineering, 2017-10)
    In the context of the Laue project devoted to build a Laue lens prototype for focusing celestial hard x-/soft gamma-rays, a Laue lens made of bent crystal tiles, with 20-m focal length, is simulated. The focusing energy ...
  • Experimental evaluation of centroiding algorithms at different light intensity and noise levels 
    Roopashree, M. B; Vyas, A; Prasad, B. R (American Institute of Physics, 2011-10)
    In this paper, we present results from an experimental evaluation of centroiding algorithms, simple center of gravity (CoG) and weighted center of gravity (WCoG) in a Shack Hartmann wavefront sensor at different light ...
  • Experimental validation of XRF inversion code for Chandrayaan-1 
    Athiray, P. S; Sudhakar, M; Tiwari, M. K; Narendranath, S; Lodha, G. S; Deb, S. K; Sreekumar, P; Dash, S. K (Elsevier B.V., 2013-12)
    We have developed an algorithm (x2abundance) to derive the lunar surface chemistry from X-ray fluorescence (XRF) data for the Chandrayaan-1 X-ray Spectrometer (C1XS) experiment. The algorithm converts the observed XRF line ...
  • Experimental verification of the new mounting of concave grating 
    Singh, M (National Institute of Science Communication and Information Resource, 1977-12)
  • Explaining the Observed Polarization from Brown Dwarfs by Single Dust Scattering 
    Sengupta, S (The American Astronomical Society, 2003-03)
    Recent observation of linear optical polarization from brown dwarfs confirms the dust hypothesis in the atmospheres of brown dwarfs with effective temperature higher than 1400 K. The observed polarization could arise because ...

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