IIAP Publications: Recent submissions

  • Distribution of Supergranular Sizes 
    Srikanth, R; Singh, J; Raju, K. P (The American Astronomical Society, 2000-05)
    A gradient-based method of tessellation was applied to SOHO Dopplergrams and to Ca II K filtergrams in order to study the cellular pattern of the solar surface, in specific the geometric relationship between the tessellation ...
  • Effects of nuclear structure on parity nonconservation in atomic cesium in relativistic mean field theory 
    Panda, P. K; Das, B. P (The American Physical Society, 2000-12)
    We use relativistic mean field theory, which includes scalar and vector mesons, to calculate the binding energy and charge radii in 125Cs-139Cs. We then evaluate the nuclear structure corrections to the weak charges for a ...
  • The Chemical Compositions of the SRD Variable Stars. III. KK Aquilae, AG Aurigae, Z Aurigae, W Leo Minoris, and WW Tauri 
    Giridhar, S; Lambert, D. L; Gonzalez, G (The Astronomical Society of the Pacific, 2000-12)
    Chemical compositions are derived from high-resolution spectra for five field SRd variables. These supergiants not previously analyzed are shown to be metal poor: KK Aql with [Fe/H]=-1.2, AG Aur with [Fe/H]=-1.8, Z Aur ...
  • Radiative Transfer Effects and the Dynamics of Small-Scale Magnetic Structures on the Sun 
    Rajaguru, S. P; Hasan, S. S (The American Astronomical Society, 2000-11)
    The dynamical consequences of radiative energy transport on the evolution of gas confined to small-scale magnetic structures on the Sun are studied. Convective collapse, which transforms weak-field structures into intense ...
  • Results from a revisit to the K2V bright points 
    Sivaraman, K. R; Gupta, S. S; Livingston, W. C; Damé, L; Kalkofen, W; Keller, C. U; Smartt, R; Hasan, S. S (European Southern Observatory, 2000-11)
    We have used pairs of temporally simultaneous CaII K-line spectroheliograms and magnetic area scans to search for spatial correlation between the CaII K2V bright points in the interior of the network and corresponding ...
  • Changing molecular gas properties in the bar and center of NGC 7479 
    Hüttemeister, S; Aalto, S; Das, M; Wall, W. F (European Southern Observatory, 2000-11)
    We present sensitive interferometric 12/supCO, 13/supCO and HCN observations of the barred spiral galaxy NGC 7479, one of the few barred galaxies known to have a continuous gas-filled bar. We focus on the investigation and ...
  • Ionization potentials of beryllium-like ions from the relativistic coupled-cluster-based linear response theory 
    Chaudhuri, R. K; Panda, P. K; Merlitz, H; Das, B. P; Mahapatra, U. S; Mukherjee, D (Institute of Physics, 2000-11)
    We first test our recently developed relativistic coupled-cluster-based linear response theory (RCCLRT) by computing the principal and the shake-up ionization potentials (IP) of highly stripped atoms. Comparison is made ...
  • Non-radial Oscillations in an Axisymmetric MHD Incompressible Fluid 
    Satya Narayanan, A (Indian Academy of Sciences, 2000-12)
    It is well known from Helioseismology that the Sun exhibits oscillations on a global scale, most of which are non_radial in nature. These oscillations help us to get a clear picture of the internal structure of the Sun as ...
  • High energy universe -- Satellite missions 
    Krishan, V (Indian Academy of Sciences, 2000-12)
    A variety of satellite missions to observe the high energy universe are currently operating and some more with more versatility and capability are on the anvil. In this paper, after giving a brief introduction to the ...
  • Workshop I – Black holes and compact objects: Classical aspects 
    Ramachandra, B. S; Vishveshwara, C. V (Indian Academy of Sciences, 2000-10)
    This is a summary of the papers presented in session W1 on the papers submitted to the workshop I on the classical aspects of black holes and compact objects were classified into three categories: (i) theoretical aspects; ...
  • Early Observations of the Afterglow of GRB 000301c 
    Bhargavi, S. G; Cowsik, R (The American Astronomical Society, 2000-12)
    We report multiband observations of the optical transient associated with GRB 000301c carried out 2000 March 2-4 using the 2.34 m Vainu Bappu Telescope at Kavalur, India. When combined with other reported data, the initial ...
  • Black holes in nonflat backgrounds: The Schwarzschild black hole in the Einstein universe 
    Nayak, R. K; MacCallum, M. A; Vishveshwara, C. V (The American Physical Society, 2001-01)
    As an example of a black hole in a non-flat background a composite static spacetime is constructed. It comprises a vacuum Schwarzschild spacetime for the interior of the black hole across whose horizon it is matched onto ...
  • Effect of radiative cooling on collapsing charged grains 
    Pandey, B. P; Krishan, V; Roy, M (Indian Academy of Sciences, 2001-01)
    The effect of the radiative cooling of electrons on the gravitational collapse of cold dust grains with fluctuating electric charge is investigated. We find that the radiative cooling as well as the charge fluctuations, ...
  • Dependence of SSNM on SSNm - a Reconsideration for Predicting the Amplitude of a Sunspot Cycle 
    Ramesh, K. B (Springer, 2000-12)
    An improved correlation between maximum sunspot number (SSNM) and the preceding minimum (SSNm) is reported when the monthly mean sunspot numbers are smoothed with a 13-month running window. This relation allows prediction ...
  • Core effects on ionization potentials in thallium 
    Merlitz, H; Gopakumar, G; Chaudhuri, R. K; Das, B. P; Mahapatra, U. S; Mukherjee, D (The American Physical Society, 2001-02)
    Ionization potentials (IP's) are evaluated for various excited states of Tl using the relativistic coupled cluster (CCCD) theory in the even-parity pair channel approximation (CCSD-EPC). An average accuracy below half a ...
  • Origin and propagation of extremely high-energy cosmic rays 
    Bhattacharjee, P; Sigl, G. G (Elsevier, 2000-04)
    Cosmic ray particles with energies in excess of 10**20 eV have been detected. The sources as well as the physical mechanism(s) responsible for endowing cosmic ray particles with such enormous energies are unknown. This ...
  • Relativistic coupled-cluster-based linear response theory for ionization potentials of alkali-metal and alkaline-earth-metal atoms 
    Chaudhuri, R. K; Panda, P. K; Das, B. P; Mahapatra, U. S; Mukherjee, D (The American Physical Society, 1999-07)
    We have developed and applied the relativistic coupled-cluster-based linear response theory (RCCLRT) for computing the principal as well as the shake-up ionization potentials (IP's) of Li, Be, Na, and Mg where the ...
  • Relics of the cosmological QCD phase transition 
    Bhattacharyya, A; Alam, J. E; Sarkar, S; Roy, P; Sinha, B; Raha, S; Bhattacharjee, P (The American Physical Society, 2000-04)
    The abundance and size distribution of quark nuggets ~QN’s!, formed a few microseconds after the big bang due to a first-order QCD phase transition in the early universe, has been estimated. It appears that stable QN’s could ...
  • Type I radio bursts and the minimum between sunspot cycles 22 & 23 
    Ramesh, R; Shanmugha Sundaram, G. A (European Southern Observatory, 2000-12)
    Spectral observations of Type I radio bursts published in the Solar Geophysical Data are used to show that the minimum between solar cycles 22 & 23 occurred during October 1996.
  • Leaves from an unwritten diary- S.Chandrashekhar: Reminiscences and reflections 
    Vishveshwara, C. V (Current Science Association, 2000-04)

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