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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Bappu, M. K. V; Sivaraman, K. R (Royal Astronomical Society, 1977-02)
    K-emission line widths measured with a micrometer on integrated spectra of the sun have a mean value of 38.2 km/s. A definition is proposed whereby the width is a measure in km/s at the inverse-e value of the difference ...
  • Sivaraman, K. R; Kariyappa, R (Springer-Verlag Berlin Heidelberg, 1986)
    We have made plots of the Ca II K line emission vs the global surface magnetic field for the sun for the years 1975–1982 representing both solar minimum as well as solar maximum epochs. These plots show that the K-line ...
  • Mallik, D. C. V (Indian Academy of Sciences, 2000-09)
    In 1920, K. S. Krishnan was a demonstrator in chemistry in Madras Christian College. Alexander Moffat, his teacher in physics, was very fond of him and had already spotted his exceptional talent in sci- ence. So, when ...
  • Sivaraman, K. R (The American Astronomical Society, 1982-03)
    The K2V/K2R asymmetry in the self-reversed emission peaks of the Ca II K line in the sun is the result of the redward displacement of K3. This redward displacement is explained as caused by the dark condensations in K3 and ...
  • Biswas, S; Kumar, S; Sivaram, C (Springer, 1989-11)
    A study of strong gravity theory is carried out in five-dimensional Kaluza-Klein space-time. A relation between the cosmological constant and the radius parameter of the fifth dimension is obtained. The effect of the extra ...
  • Von Essen, C; Ofir, A; Dreizler, S; Agol, E; Freudenthal, J; Hernández, J; Wedemeyer, S; Parkash, V; Deeg, H. J; Hoyer, S; Morris, B. M; Becker, A. C; Sun, L; Gu, S. H; Herrero, E; Tal-Or, L; Poppenhaeger, K; Mallonn, M; Albrecht, S; Khalafinejad, S; Boumis, P; Delgado-Correal, C; Fabrycky, D. C; Janulis, R; Lalitha, S; Liakos, A; Mikolaitis, S; Moyano D-Angelo, M. L; Sokov, E; Pakstiene, E; Popov, A; Krushinsky, V; Ribas, I; Rodríguez S, M. M; Rusov, S; Sokova, I; Tautvaisiene, G; Wang, X (EDP Sciences, 2018-07)
    During its four years of photometric observations, the Kepler space telescope detected thousands of exoplanets and exoplanet candidates. One of Kepler’s greatest heritages has been the confirmation and characterization of ...
  • Ramachandra, B. S; Rajesh Nayak, K; Vishveshwara, C. V (Springer, 2003-11)
    The Vaidya-Einstein-Kerr (VEK) black hole which represents the spacetime of the Kerr black hole in a non-vacuum, asymptotically non-flat background is investigated. The energy-momentum tensor corresponding to this spacetime ...
  • Singh, V; Ishwara-Chandra, C. H; Wadadekar, Yogesh; Beelen, Alexandre; Kharb, P (Oxford University Press on behalf of the Royal Astronomical Society, 2015-01-01)
    Seyfert and LINER galaxies are known to exhibit compact radio emission on ∼10–100 pc scales, but larger Kiloparsec-Scale Radio structures (KSRs) often remain undetected in sub-arcsec high-resolution observations. We ...
  • Banerjee, D. P. K; Anandarao, B. G; Jain, S. K; Mallik, D. C. V (The European Southern Observatory, 1990-12)
    High-resolution Fabry-Perot observations have been made to determine the velocity structure of five PNe and to subsequently relate the observations to the morphology of the objects. New kinematic data on one of these PNe, ...
  • Sagar, R; Bhatt, H. C (Indian Academy Sciences, 1988-06)
    Kinematical distances are estimated for six open star clusters. They agree fairly well with the photometric distances. The kinematical distances cannot, at present, be estimated better than the photometric distances. When ...
  • Couto, G. S; Storchi-Bergmann, T; Axon, D. J; Robinson, A; Kharb, P; Riffel, R. A (Oxford University Press on behalf of the Royal Astronomical Society, 2013-11-11)
    We present a two-dimensional analysis of the gaseous excitation and kinematics of the inner 2.5 × 1.7 kpc2 of the low-ionization nuclear emission-line region (LINER)/Seyfert 1 galaxy Arp 102B, from optical spectra obtained ...
  • Mohan, Prashanth; Mangalam, A (IOP Publishing, 2015-07-01)
    We present a general relativistic (GR) model of jet variability in active galactic nuclei due to orbiting blobs in helical motion along a funnel or cone-shaped magnetic surface anchored to the accretion disk near the black ...
  • Kapoor, R. C; Shukre, C. S (The American Astronomical Society, 1998-07)
    We have investigated in detail the geometry of the open magnetic field line structure of an oblique dipole rotator, with a view to attaining a better understanding of the geometry of pulsar beams in the polar cap model of ...
  • Choudhury, R; Bhatt, H. C (Royal Astronomical Society, 2009-03)
    An analysis of the proper motion measurements of the young stellar objects (YSOs) associated with the cometary globules (CGs) in the Gum Nebula is presented. While earlier studies based on the radial-velocity measurements ...
  • Manoj, P; Bhatt, H. C (EDP Sciences, 2005-01)
    We have used the velocity dispersion as an age indicator to constrain the ages of a large sample of main sequence Vega-like stars in order to study the lifetimes and temporal evolution of the dust disks around them. We use ...
  • Bhaskaran, P; Krishan, V (Springer, 1995-10)
    A kinetic description of the equilibrium structure of accretion disc plasma is presented. It is possible to have an equilibrium configuration for a stationary axisymmetric gravitating plasma disc with spatial gradients in ...
  • Pandey, B. P; Lakhina, G. S; Krishan, V (The American Physical Society, 1999-12)
    A kinetic theory of the Jeans instability of a dusty plasma has been developed in the present work. The effect of grain charge fluctuations due to the attachment of electrons and ions to the grain surface has been considered ...
  • Datta, B; Bhattacharyya, J. C (Nehru Centre, 1985-09)
  • Hasan, S. S; Kalkofen, W; van Ballegooijen, A. A; Ulmschneider, P (The American Astronomical Society, 2003-03)
    We examine the propagation of kink and longitudinal waves in the solar magnetic network. Previously, we investigated the excitation of network oscillations in vertical magnetic flux tubes through buffeting by granules and ...
  • Satya Narayanan, A; Ramesh, R; Kathiravan, C; Ebenezer, E (Astronomical Society of the Pacific, 2004-12)
    The solar coronal plasma is highly structured in the magnetic field, density and temperature. This plays a crucial role in the theory of MHD oscillations. In this study, we model a coronal loop to be made up of a cylindrical ...

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