IIAP Publications: Recent submissions

  • Enhanced luminosity of young stellar objects in cometary globules 
    Maheswar, G; Bhatt, H. C (Springer, 2008-06)
    In this study we investigated the effects of external trigger on the characteristics of young stellar objects (YSOs) associated with cometary globules (CGs). We made optical spectroscopy of stars associated with star-forming ...
  • The behaviour of λ4686 line of He II in Wolf-Rayet binaries 
    Shylaja, B. S (International Astronomical Union, 1987)
    The binaries with subgroup WN components have been chosen, with periods ranging from 1.64 d to 21.63 d, for understanding the effect of the companion on the formation of this line.
  • Be phenomenon in open clusters: results from a survey of emission-line stars in young open clusters 
    Mathew, B; Subramaniam, A; Bhatt, B. C (The Royal Astronomical Society, 2008-08)
    Emission-line stars in young open clusters are identified to study their properties, as a function of age, spectral type and evolutionary state. 207 open star clusters were observed using the slitless spectroscopy method ...
  • Effects of partial frequency redistribution functions R(II), R(III) and R(V) on source functions 
    Mohan Rao, D; Rangarajan, K. E; Peraiah, A (Indian Academy of Sciences, 1984-06)
    The effects of partial frequency redistribution on the formation of spectral lines have been studied. The angle-averaged R(II), R(III) and R(V) types of redistribution with isotropic phase function have been considered. ...
  • Nonlinear response of slender magnetic flux tubes to external pressure fluctuations 
    Venkatakrishnan, P (Springer, 1986-04)
    The effect of applying external pressure fluctuations on slender flux tubes is studied as a nonlinear initial value problem. It is shown that persistent nonlinear resonant response to pressure fluctuations is possible for ...
  • On the saturation of the refractive index structure function. II - Influence of the correlation length on astronomical 'seeing' 
    Venkatakrishnan, P (Royal Astronomical Society, 1987-12)
    A physical length scale in the wavefront corresponding to the parameter (r/sub0/) characterizing the loss in detail in a long exposure image is identified, and the influence of the correlation scale of turbulence as r/sub ...
  • 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 ...
  • 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 ...

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