IIAP Publications: Recent submissions

  • The 1995-96 decline of R Coronae Borealis: high-resolution optical spectroscopy 
    Kameswara Rao, N; Lambert, D. L; Adams, M. T; Doss, D. R; Gonzalez, G; Hatzes, A. P; James, C. R; Johns-Krull, C. M; Luck, R. E; Pandey, G; Reinsch, K; Tomkin, J; Woolf, V. M (The Royal Astronomical Society, 1999-12)
    A set of high-resolution optical spectra of R CrB acquired before, during and after its 1995-96 decline is discussed. All of the components reported from earlier declines are seen. This novel data set provides new information ...
  • The R Coronae Borealis stars - atmospheres and abundances 
    Asplund, M; Gustafsson, B; Lambert, D. L; Kameswara Rao, N (European Southern Observatory, 2000-01)
    An abundance analysis of the H-deficient and He- and C-rich R Coronae Borealis (R CrB) stars has been undertaken to examine the ancestry of the stars. The investigation is based on high-resolution spectra and line-blanketed ...
  • Birth and early evolution of a planetary nebula 
    Bobrowsky, M; Sahu, K. C; Parthasarathy, M; García-Lario, P (Nature Publishing Group, 1998-04)
    The final expulsion of gas by a star as it forms a planetary nebula - the ionized shell of gas often observed surrounding a young white dwarf - is one of the most poorly understood stages of stellar evolution,. Such nebulae ...
  • Long-Wavelength Observations of Jets from Polar Regions of the Sun 
    Ramesh, R (Kluwer Academic Publishers, 1999-10)
    We report radio observations of enhanced emission associated with the extreme-ultraviolet (EUV) jets from polar coronal hole regions of the Sun, with the Gauribidanur radioheliograph (GRH). We have estimated the brightness ...
  • The Correlation Lifetimes of Chromospheric CA II K Network Cells 
    Raju, K. P; Srikanth, R; Singh, J (Springer, 1998-03)
    The lifetimes and spatial scales of emission network cells in the solar chromosphere were studied from a nearly continuous sequence of Caii K filtergrams, obtained from Antarctica. The temporal autocorrelation function ...
  • A Correlative Study of Green Coronal Intensity with Other Solar Indices 
    Ramesh, K. B (Springer, 1998-01)
    Lomnicky Stit data of 5303 U coronal green-line index (CI) are analysed for the years 1965–1994. The yearly quiet-Sun component (Q_ci) of CI estimated through the linear regression analysis of CI with sunspot numbers (SS) ...
  • Measurement of Kodaikanal white-light images - IV. Axial Tilt Angles of Sunspot Groups 
    Sivaraman, K. R; Gupta, S. S; Howard, R. F (Kluwer Academic Publishers, 1999-10)
    The Kodaikanal sunspot data set, covering the interval 1906-1987, is used in conjunction with the similar Mount Wilson sunspot data set, covering the interval 1917-1985, to examine characteristics of sunspot group axial ...
  • Cp-Violation in Epr-Like Neutrino Oscillations 
    Samal, M. K (World Scientific Publishing Company, 1998-03)
    After reviewing the general framework to study EPR-like neutrino oscillations, we derive expressions for the oscillation probabilities and a direct measure of CP-violation. We compare the possibility of studying CP-violation ...
  • Cosmological QCD phase transition and dark matter 
    Bhattacharyya, A; Alam, J; Sarkar, S; Roy, P; Sinha, B; Raha, S; Bhattacharjee, P (Elsevier, 1999-12)
    The authors calculate the size distribution of quark nuggets, which could be formed due to first order QCD phase transition in the early universe. They find that there are a large number of stable quark nuggets which could ...
  • Gyroscopic Precession and Inertial Forces in Axially Symmetric Stationary Spacetimes 
    Rajesh Nayak, K; Vishveshwara, C. V (Springer, 1998-04)
    We study the phenomenon of gyroscopic precession and the analogues of inertial forces within the framework of general relativity. Covariant connections between the two are established for circular orbits in stationary ...
  • Dependence of the meridional motions of sunspot groups on life spans and age of the groups, and on the phase of the solar cycle 
    Javaraiah, J (Kluwer Academic Publishers, 1999-10)
    We have analyzed data on sunspot groups compiled during 1874-1981 and investigated the following: (i) dependence of the `initial' meridional motion (v_ini(τ)) of sunspot groups on the life span (τ) of the groups in the ...
  • TeV and Superheavy Particles from Supersymmetric Topological Defects, the Extragalactic γ-ray Background, and the Highest Energy Cosmic Rays 
    Bhattacharjee, P; Shafi, Qaisar; Stecker, F. W (The American Physical Society, 1998-04)
    Cosmic topological defects in a wide class of supersymmetric theories can simultaneously be sources of Higgs bosons of mass~supersymmetry breaking scale~TeV, as well as superheavy gauge bosons of mass~η>>1 TeV, η being the ...
  • Spectral line radiation from solar small-scale flux tubes. II 
    Hasan, S. S; Kneer, F; Kalkofen, W (European Southern Observatory, 1998-04)
    We examine spectral line radiation from small-scale magnetic flux tubes in the solar atmosphere. This is a continuation of work by Kneer et al. (1996). The main difference with the previous investigation is in the choice ...
  • Abundance similarities between the RCrB star V854Cen and the born-again Sakurai's object 
    Asplund, M; Gustafsson, B; Kameswara Rao, N; Lambert, D. L (European Southern Observatory, 1998-04)
    The elemental abundances of the mildly hydrogen-deficient R Coronae Borealis (RCrB) star V854Cen have been estimated. The RCrB stars have been divided into majority and minority classes judging by their abundance patterns. ...
  • An operator perturbation method for polarized line transfer. III. Applications to the Hanle effect in 1D media 
    Nagendra, K. N; Frisch, H; Faurobert-Scholl, M (European Southern Observatory, 1998-04)
    In this paper we present an Approximate Lambda Iteration method to treat the Hanle effect (resonance scattering in the presence of a weak magnetic field) for lines formed with complete frequency redistribution. The Hanle ...
  • Black Holes and Rotation 
    Vishveshwara, C. V (Indian Academy of Sciences, 1999-12)
    In this article, we first consider briefly the basic properties of the non –rotating schwarzschild black hole and the rotating Kerr Black hole rotational effects are then described in static and stationary spacetimes with ...
  • DP 2 electric field fluctuations in the dusk-time dip equatorial ionosphere 
    Abdu, M. A; Sastri, J. H; Luhr, H; Tachihara, H; Kitamura, T; Trivedi, N. B; Sobral, J. H. A (American Geophysical Union, 1998-05)
    We have studied the geomagnetic and ionospheric manifestations of the DP 2 activity that occurred on April 7, 1995 using high time resolution magnetometer data of IMAGE network in Scandinavia and of Alcantara (dip 1.2° N), ...
  • Radial modes of rotating neutron stars in the Chandrasekhar-Friedman formalism 
    Datta, B; Hasan, S. S; Sahu, P. K; Prasanna, A. R (World Scientific Publishing Company, 1998-02)
    Eigenfrequencies of radial pulsations of "slowly" rotating neutron stars are calculated in a general relativistic formalism given by Chandrasekhar and Friedman (1972). It is found that the square of the frequencies are ...
  • Cosmic ether 
    Tomaschitz, R (Springer, 1998-03)
    A prerelativistic approach to particle dynamics is explored in an expanding Robertson-Walker cosmology. The receding galactic background provides a distinguished frame of reference and a unique cosmic time. In this context ...
  • Polarization measurements of Vega-like stars 
    Bhatt, H. C; Manoj, P (European Southern Observatory, 2000-10)
    Optical linear polarization measurements are presented for about 30 Vega-like stars. These are then compared with the polarization observed for normal field stars. A significant fraction of the Vega-like stars are found ...

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