IIA Institutional Repository: Recent submissions

  • Spatial profiles of lines in active region loops 
    Krishan, V (Springer, 1983-10)
    From the statistical treatment of magnetohydrodynamically turbulent plasma, a steady-state density, temperature and magnetic field structure is derived for a coronal loop emitting in UV and EUV range. Spatial variation of ...
  • A flattening in the optical light curve of SN 2002ap 
    Pandey, S. B; Anupama, G. C; Sagar, R; Bhattacharya, D; Sahu, D. K; Pandey, J. C (Royal Astronomical Society, 2003-04)
    We present the UBVRcIc broad-band optical photometry of the Type Ic supernova SN 2002ap obtained during 2002 February 6-March 23 in the early decline phases and also later on 2002 August 15. Combining these data with the ...
  • The afterglow and the host galaxy of GRB 011211 
    Jakobsson, P; Hjorth, J; Fynbo, J. P. U; Gorosabel, J; Pedersen, K; Burud, I; Levan, A; Kouveliotou, C; Tanvir, N; Fruchter, A; Rhoads, J; Grav, T; Hansen, M. W; Michelsen, R; Jensen, B. L; Pedersen, H; Thomsen, B; Weidinger, M; Bhargavi, S. G; Cowsik, R; Pandey, S. B (The European Southern Observatory, 2003-09)
    We present optical, near-infrared, and X-ray observations of the optical afterglow (OA) of the X-ray rich, long-duration gamma-ray burst GRB 011211. Hubble Space Telescope (HST) data obtained 14, 26, 32, and 59 days after ...
  • Microflares in accretion disks 
    Krishan, V; Ramadurai, S; Wiita, P. J (The European Southern Observatory, 2003-02)
    We have investigated the phenomenon of explosive chromospheric evaporation from an accretion disk as a mechanism for fast variability in accreting sources such as low mass X-ray binaries and active galactic nuclei. This ...
  • Light Scattering by a Dielectric Film with Periodically Varying Refractive Index Profile 
    Chatterjee, S (Institute of Physics and IOP Publishing Limited, 2003-03)
    We study the scattering of light by a dielectric film with a periodic gradation of the refractive index along its thickness. The intensity of the scattered light is calculated in the scalar wave approximation, in which the ...
  • Early Holocene climate recorded in geomorphological features in Western Tibet 
    Brown, E. T; Bendick, R; Bourles, D. L; Gaur, V. K; Molnar, P; Raisbeck, G. M (Elsevier Science BV, 2003-10)
    Cosmic ray exposure ages for formation of perched alluvial terraces and for abundant of an alluvial/debrisflow fan on opposite slides of the Tangtse Valley (The out flow at the northwest end of lake panggong, which is in ...
  • Transition probability parameters for certain band systems of astrophysical molecule GeO 
    Rajamanickam, N; Shanmugavel, R; Prithivikumaran, N; Palaniselvam, T; Bagare, S. P (Elsevier Science B.V., 2003-05)
    The transition probability parameters, Franck-Condon factors and /r-centroids, have been evaluated using the most reliable numerical integration procedure for the bands of E1Σ+, F1Σ+, /GΣ, HΠ, JΣ-X1Σ+ systems of astrophysical ...
  • Relativistic coupled cluster calculations of the energies for rubidium and cesium atoms 
    Chaudhuri, R. K; Sahoo, B. K; Das, B. P; Merlitz, H; Mahapatra, U. S; Mukherjee, D (American Institute of Physics, 2003-11)
    Ionization potentials and excitation energies of rubidium and cesium atoms are computed using the relativistic coupled cluster (CC) method. The effect of electron correlations on the ground and excited state properties is ...
  • Study of interstellar extinction in some young open clusters 
    Sagar, R (Royal Astronomical Society, 1987-09)
    Interstellar extinction has been studied in 15 open clusters, based on reliable cluster members and precise observational data. Out of these, 10 show nonuniform extinction across the cluster region. Most of these show ...
  • Phase-separated charge-density-wave phase in the two-species extended Bose-Hubbard model 
    Mishra, T; Sahoo, B. K; Pai, R. V (The American Physical Society, 2008-07)
    We study the quantum phase transitions in a two component Bose mixture in a one-dimensional optical lattice. The calculations have been performed in the framework of the extended Bose-Hubbard model using the finite size ...
  • A study of faint young open clusters as tracers of spiral features in our Galaxy. III - Collinder 97 (OCl 506) 
    Babu, G. S. D (Indian Academy of Sciences, 1987-09)
    Photoelectric and photographic photometry of twenty-nine stars was done in the field of the open cluster Collinder 97 ≡ OCl 506. Of these stars, a total of twenty-four have been found to be possible members. There is ...
  • Galactic Bulge Hypervelocity (HVS) RR Lyrae Variable Stars and One High Galactic Latitude HVS HB Star 
    Parthasarathy, M (American Astronomical Society, 2024-01)
    Six Galactic Bulge Hypervelocity (HVS) RR Lyrae stars and one high galactic latitude HVS Horizontal Branch (HB) star found from the ongoing search for HVS in the Gaia DR3 and SIMBAD data are presented. Some of these stars ...
  • Relativistic coupled-cluster studies of dipole polarizabilities in closed-shell atoms 
    Sahoo, B. K; Das, B. P (The American Physical Society, 2008-06)
    We investigate the role of electron correlation effects in the electric-dipole polarizabilities of the ground states of the alkaline earth metals, helium, and ytterbium by employing the relativistic coupled-cluster (RCC) ...
  • Response of the equatorial ionosphere to solar magnetic sector crossing 
    Sastri, J. H (National Research Council of Canada, 1985-04)
    A superposed epoch analysis has been carried out of h′F values at Kodaikanal (10°14′N, 77°28′E, dip 3.0°N) pertaining to years of high sunspot activity using solar wind sector boundary passages past the earth as key days. ...
  • Neutral fermions as the missing mass matter in galactic halos 
    Datta, B; Sivaram, C; Ghosh, S. K (Springer, 1985-04)
    Several independent considerations which rule out the hypothesis that the missing mass in galactic halos is composed of massive neutral fermions such as neutrinos, gravitinos, or photinos are discussed. It is found that ...
  • Thermal overstability of hydromagnetic surface waves 
    Joarder, P. S; Gokhale, M. H; Venkatakrishnan, P (Kluwer Academic Publishers, 1987-09)
    The authors investigate the effects of radiative heat losses and thermal conductivity on the hydromagnetic surface waves along a magnetic discontinuity in a plasma of infinite electrical conductivity. They show that the ...
  • Classical Cepheids and the local chemical inhomogeneities in the galactic disc 
    Giridhar, S (1986-06)
    Places of formation have been derived for a sample of 23 Cepheids with well-determined atmospheric abundances in an attempt to study the chemical inhomogeneities in the local interstellar medium. The abundance data available ...
  • Calculation of the electron-nucleus scalar-pseudoscalar interaction constant WS for YbF and BaF molecules: A perturbative approach 
    Nayak, M. K; Chaudhuri, R. K (The American Physical Society, 2008-07)
    The P,T -odd interaction constant, WS , for the ground state of YbF and BaF molecules are calculated using the second-order many-body perturbation theory (MBPT) via Z -vector technique. The interaction constant WS reported ...
  • Spectroscopic studies of the southern Cepheid β Dor 
    Giridhar, S (Universidad Nacional Autonoma De Mexico, 1987-05)
    Fine analysis of the southern Cepheid β Dor has been conducted at different phases with the aim to derive atmospheric parameters at those phases. Atmospheric abundances have been derived for Fe group elements and s-process ...
  • Is 21-cm absorption associated with the emission-line regions of quasars? 
    Krishan, V (Royal Astronomical Society, 1988-03)
    The 21-cm absorption line observed in several QSO systems is believed to originate in neutral hydrogen clouds in the vicinity of the QSOs. The aim of this paper is to show that 21-cm absorption can also originate in a ...

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