IIA Institutional Repository: Recent submissions

  • Reflection nebula in the far-ultraviolet. 2. Silicate and graphite grains 
    Shah, G. A; Krishna Swamy, K. S (Indian Institute of Astrophysics, 1979-11)
    Simple models of the reflection nebula in the form of homogeneous plane-parallel slab containing single scattering silicate and graphite grains taken one species at a time have been considered in view of the far-ultraviolet ...
  • RII partial frequency redistribution function and its effects on the formation of lines in expanding spherical atmospheres 
    Peraiah, A (Indian Institute of Astrophysics, 1979-11)
    The redistribution in frequency in lines formed in atmospheres in which the matter is moving radially outwards with velocity gradients is studied in the rest frame of the star. We velocity gradients is studied in the rest ...
  • Comoving frame calculations with Lorentz profiles in radially expanding media 
    Peraiah, A; Raghunath, G (Indian Institute of Astrophysics, 1979-11)
    A computationally simple method for solving the line transfer in comoving frame has been described for radially expanding spherical medium. We have assumed a radially increasing velocity distribution and a non-LTE (where ...
  • Motion of a particle in the background of a white hole 
    Kapoor, R. C (Indian Institute of Astrophysics, 1979-11)
    A study has been made of the motion of a test particle in the background of a white hole particularly from the view point of its visibility to an observer at infinity. It is shown that radial as well as non-radial photons ...
  • 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 ...
  • An analysis of Babinet compensator fringes using Jones calculus 
    Pandya, T. P; Saxena, A. K (Indian Institute of Astrophysics, 1978)
    Following Jones Calculus, a comprehensive theory of the Babinet Compensator has been presented. The performance of the system governed by the compensator-Polaroid unit, has been evaluated in terms of fringe visibility. ...
  • Radial velocities of seven Sersic galaxies 
    Prabhu, T. P (Indian Institute of Astrophysics, 1978)
    The radial velocities of 7 Sersic galaxies are reported. Three out of these (NGC 2903, 2997 and 5236) have published radial velocities prior to this work while the radial velocities of four remaining galaxies (NGC 922, ...
  • Curvature, phase space, holography and black hole entropy 
    Sivaram, C; Arun, K (World Scientific Publishing, 2009-12)
    This paper discusses the thermodynamics of a black hole with respect to Hawking radiation and the entropy. We look at a unified picture of black hole entropy and curvature and how this can lead to the usual black hole ...
  • Spatially resolved images and solar irradiance variability 
    Kariyappa, R (Springer, 2008-03)
    The Sun is the primary source of energy that governs both the terrestrial climate and near-earth space environment. Variations in UV irradiances seen at earth are the sum of global (solar dynamo) to regional (active region, ...
  • C. Ragoonatha Charry and variable star astronomy 
    Kameswara Rao, N; Vagiswari, A; Thakur, P; Birdie, C (Centre for Astronomy, 2009-11)
    C. Ragoonatha Charry, the First Assistant at Madras Observatory from 1864 to 1880, was not only a noted Indian observational astronomer but also someone who emphasized the need for incorporating modern observationally-based ...
  • Optical polishing for development of highly specular sunshield for radiant coolers of meteorological satellites of ISRO 
    Madhu Prasad; Saxena, A. K (Indian Space Research Organisation, ISRO Satellite Centre, 2010-01-22)
    Radiant cooler is used to cool the infrared and water vapour detectors of meteorological payload of several geosynchronous satellites of ISRO. A three stage cooler was developed at Thermal Systems Group, ISAC to achieve ...
  • Recent outburst of U ScorpII 
    Shylaja, B. S; Prabhu, T. P (Indian Institute of Astrophysics, 1979-11)
    A photoelectric scan of Hβ and a photographic spectrum between λλ 4500-7000 obtained during the 1979 outburst of the recurrent nova U Sco have been studied. The electron density and the mass of ionized hydrogen in the nova ...
  • Speckle interferometry technique for astronomical observations 
    Saha, S. K (The Optical Society of India, 2003)
  • Observation of a magnetic sub-storm event in the equatorial thermosphere - suggestions for interpretation 
    Saha, S. K (Indian Association for the Cultivation of Science, 2001)
  • Less is more? are radiogalaxies below the fanaroff-riley break more polarised on pc-scales? 
    Kharb, P; Shastri, P; Gabuzda, D. C (Springer, 2008)
  • X-ray emission from seyfert galaxies: surroundings of their supermassive black holes 
    Singh, V; Shastri, P (American Institute of Physics, 2008-08)
    We study the systematics of the X-ray emission from Seyfert nuclei in the frame work of unification. In order to do this rigorously a sample with types 1 and 2 matched in orientation-independent parameters is studied. The ...
  • A method to determine distances to molecular clouds using near-IR photometry 
    Maheswar, G; Lee, C. W; Bhatt, H. C; Mallik, S. G. V; Dib, S (EDP Sciences, 2010-01)
    We aim to develop a method to determine distances to molecular clouds using JHK near-infrared photometry. Methods: The method is based on a technique that aids spectral classification of stars lying towards the fields ...
  • A radio continuum and H I study of optically selected blue compact dwarf galaxies: Mrk 1039 and Mrk 0104 
    Ramya, S; Kantharia, N. G; Prabhu, T. P (Astronomical Society of the Pacific, 2009-09)
    We present a GMRT radio continuum and H I study of two Blue Compact Dwarf (BCD) galaxies Mrk 1039 and Mrk 0104. GMRT 610 MHz observations of Mrk 1039 show that the emission is coincident with a bright intense star forming ...
  • The asteroseismic potential of Kepler: first results for solar-type stars 
    Chaplin, W. J; Appourchaux, T; Elsworth, Y; Garcia, R. A; Houdek, G; Karoff, C; Metcalfe, T. S; Molenda-Zakowicz, J; Monteiro, M. J. P. F. G; Thompson, M. J; Brown, T. M; Kiss, L. L; Kitiashvili, I. N; Kolenberg, K; Korhonen, H; Kosovichev, A. G; Kupka, F; Lebreton, Y; Leroy, B; Ludwig, H. G; Mathis, S; Michel, E; Miglio, A; Montalban, J; Moya, A; Noels, A; Noyes, R. W; Palle, P. L; Piau, L; Preston, H. L; Roca Cortes, T; Roth, M; Sato, K. H; Schmitt, J; Serenelli, A. M; Silva Aguirre, V; Stevens, I. R; Suarez, J. C; Suran, M. D; Trampedach, R; Turck-Chieze, S; Uytterhoeven, K; Ventura, R; Christensen-Dalsgaard, J; Gilliland, R. L; Kjeldsen, H; Borucki, W. J; Koch, D; Jenkins, J. M; Ballot, J; Basu, S; Bazot, M; Bedding, T. R; Benomar, O; Bonanno, A; Brandao, I. M; Bruntt, H; Campante, T. L; Creevey, O. L; Di Mauro, M. P; Dogan, G; Dreizler, S; Eggenberger, P; Esch, L; Fletcher, S. T; Frandsen, S; Gai, N; Gaulme, P; Handberg, R; Hekker, S; Howe, R; Huber, D; Korzennik, S. G; Lebrun, J. C; Leccia, S; Martic, M; Mathur, S; Mosser, B; New, R; Quirion, P. O; Regulo, C; Roxburgh, I. W; Salabert, D; Schou, J; Sousa, S. G; Stello, D; Verner, G. A; Arentoft, T; Barban, C; Belkacem, K; Benatti, S; Biazzo, K; Boumier, P; Bradley, P. A; Broomhall, A. M; Buzasi, D. L; Claudi, R. U; Cunha, M. S; D'Antona, F; Deheuvels, S; Derekas, A; Garcia Hernandez, A; Giampapa, M. S; Goupil, M. J; Gruberbauer, M; Guzik, J. A; Hale, S. J; Ireland, M. J (IOP Publishing, 2010-04)
    We present preliminary asteroseismic results from Kepler on three G-type stars. The observations, made at one-minute cadence during the first 33.5d of science operations, reveal high signal-to-noise solar-like oscillation ...
  • Low frequency radio emission from seyfert galaxies 
    Singh, V; Shastri, P; Athreya, R (Astronomical Society of the Pacific, 2009-09)
    Seyfert galaxies are low-luminosity, radio-quiet, nearby active galaxies. The high-frequency radio observations of several Seyfert galaxies show jet-like features, which tend to be confined within the host galaxy, whereas ...

Search DSpace

Browse

My Account