IIAP Publications: Recent submissions

  • Emission Altitude from Relativistic Phase Shift Due to Plasma Corotation in Pulsars 
    Gangadhara, R. T (The Royal Swedish Academy of Sciences, 2006)
    The radio emission from a relativistic plasma in a pulsar magnetosphere experiences a relativistic phase shift due to spin and difference in the emission altitude. Using the single pulse data of PSR B0329 + 54 at 325 MHz ...
  • Density and Temperature Diagnostics of Solar Emission Lines from NeV/MgV and SiVII/MgVII Ions 
    Mohan, A; Dwivedi, B. N; Raju, P. K (Indian Academy of Sciences, 1999-06)
    We present NeV/ MgV and SiVII/MgVII theoretical line intensity ratios as a function of electron density Ne and temperature Te. These are shown in the form of ratio-ratio diagrams, which should in principle allow both Ne ...
  • Propagation effects on polarization of pulsar radio emission 
    Gangadhara, R. T; Lesch, H; Krishan, V (The Royal Astronomical Society, 1999-08)
    We consider the role of a propagation effect such as stimulated Raman scattering on the polarization of radio pulses. When an intense electromagnetic wave with frequency close to the plasma frequency interacts with the ...
  • Probing the internal magnetic field of slowly pulsating B-stars through g modes 
    Hasan, S. S; Zahn, J. P; Christensen-Dalsgaard, J (EDP Sciences, 2005-12)
    Context: . Aims: .We suggest that high-order g modes can be used as a probe of the internal magnetic field of SPB (slowly pulsating B) stars. The idea is based on earlier work by the authors hich analytically investigated ...
  • Abundances in planetary nebulae: Mz 3 
    Pottasch, S. R; Surendiranath, R (EDP Sciences, 2005-12)
    ISO spectra of the bipolar planetary nebula Mz 3 are used to determine the element abundances in the bright lobes of the nebula. The ISO spectra alone are sufficient to determine nitrogen, neon, argon, sulfur and iron ...
  • Stochastic polarized line formation. I. Zeeman propagation matrix in a random magnetic field 
    Frisch, H; Sampoorna, M; Nagendra, K. N (The European Southern Observatory, 2005-10)
    This paper considers the effect of a random magnetic field on Zeeman line transfer, assuming that the scales of fluctuations of the random field are much smaller than photon mean free paths associated to the line formation ...
  • RS Ophiuchi: radio lightcurve development following the 2006 outburst 
    Eyres, S. P. S; Rushton, M; O'Brien, T. J; Beswick, R; Muxlow, T. W. B; Davis, R; Anupama, G. C; Kantharia, N. G; Bode, M; Gawroñski, M. P; Feiler, R; Evans, A (Astronomical Society of a Pacific, 2009-01)
    We report GHz observations beginning 4.5 days after the discovery of RS Ophiuchi undergoing its 2006 recurrent nova outburst. Observations over the first 60 days are included, enabling us to follow spectral development ...
  • Baryogenesis via leptogenesis in presence of cosmic strings 
    Sahu, N; Bhattacharjee, P; Yajnik, U. A (Elsevier, 2006-09)
    We study the effect on leptogenesis due to B L cosmic strings of a U1 extension of the Standard Model. The disappearance of closed loops of B L cosmic strings can produce heavy right handed neutrinos, N's, whose CP-asymmetric ...
  • Creating the Measure of Chandrasekhar's Life 
    Miller, A. I; Mallik, D. C. V; Wali, K (American Institute of Physics, 2006-09)
  • Tachyons in Robertson-Walker cosmology 
    Tomaschitz, R (World Scientific, 1998-04)
    Superluminal signal transfer is studied in the context of a preferred cosmic frame of reference provided by the galactic background. The receding galaxies constitute a frame of absolute rest, in which the energy of tachyons ...
  • Fundamental parameters of six neglected old open clusters 
    Carraro, G; Subramaniam, A; Janes, K. A (Royal Astronomical Society, 2006-09)
    In this paper, we present the first BV I CCD photometry of six overlooked old open clusters (Berkeley 44, NGC 6827, Berkeley 52, Berkeley 56, Skiff 1 and Berkeley 5) and derive estimates of their fundamental parameters by ...
  • Electric dipole transition amplitudes for 207 Pb+ 
    Sahoo, B. K; Majumder, S; Merlitz, H; Chaudhuri, R. K; Das, B. P; Mukherjee, D (Institute of Physics, 2006-01)
    Electric dipole transition amplitudes of certain low-lying states of Pb+ have been calculated using the relativistic coupled-cluster theory and compared with previous calculations. The role of electron correlation is found ...
  • Relativistic Coupled-Cluster Theory of Atomic Parity Nonconservation: Application to 137 Ba+ 
    Sahoo, B. K; Chaudhuri, R. K; Das, B. P; Mukherjee, D (The American Physical Society, 2006-04)
    We report the result of our ab initio calculation of the 6s2/supS/sub1/2→5d2/supD/sub3/2 parity nonconserving electric dipole transition amplitude in Ba+137 based on relativistic coupled-cluster theory. Considering single, ...
  • Solar X-Ray Spectral Irradiance Variability 
    Ramesh, K. B; Sundararaman, K (Springer, 2006-04)
    Solar spectral irradiance at X-ray wavelengths show large variations over a period of solar cycle. We use X-ray irradiance data in three narrow spectral regimes deduced from Yohkoh SXT measurements to study coronal irradiance ...
  • Ab initio calculation of P, T-odd interaction constant in BaF: a restricted active space configuration interaction approach 
    Nayak, M. K; Chaudhuri, R. K (Institute of Physics, 2006-03)
    A fully relativistic restricted active space (RAS) configuration interaction (CI) approach is employed to compute the P, T-odd interaction constant W/subd of the ground 2/supΣ state of BaF. The present calculation estimates ...
  • Electric Quadrupole Moments of the D States of Alkaline-Earth-Metal Ions 
    Sur, C; Latha, K. V. P; Sahoo, B. K; Chaudhuri, R. K; Das, B. P; Mukherjee, D (The American Physical Society, 2006-05)
    The electric quadrupole moment for the 4dD5/22 state of Sr+88; one of the most important candidates for an optical clock, has been calculated using the relativistic coupled-cluster theory. This is the first application of ...
  • Total solar eclipse observations MiG-25 at 80,000 ft 
    Bhatnagar, A; Mukerji, S; Babu, Y. S; Sehgal, N. K; Kamble, V. B; Pandya, R. P; Pandya, N. P; Bhavsar, K. M; Prajapati, R. P (Indian Institute of Astrophysics, 1997)
    The objective of this project was to take intensity and polarization measurements of extended solar coronal streamers, from a height of 75,000 to 80,000 feet above the ground. Hitherto, no observations have been made of ...
  • Spectroscopic Studies of Solar Corona VIII. Temperature and Non-Thermal Variations in Steady Coronal Structures 
    Singh, J; Sakurai, T; Ichimoto, K; Muneer, S; Raveendran, A. V (Springer, 2006-07)
    With a view to investigate variations in parameters of coronal emission lines over a large range of radial distance from the limb, raster scans were made with sufficiently long exposure times on several days during September ...
  • Configuration of the Indian Moho beneath the NW Himalaya and Ladakh 
    Rai, S. S; Priestley, K; Gaur, V. K; Mitra, S; Singh, M. P; Searle, M (American Geophysical Union, 2006-08)
    Teleseismic receiver function analysis of seismograms recorded on a 700 km long profile of 17 broadband seismographs traversing the NW Himalaya shows a progressive northward deepening of the Indian Moho from 40 km beneath ...
  • Further Constraints on Electron Acceleration in Solar Noise Storms 
    Subramanian, P; Becker, P. A (Springer, 2006-08)
    We reexamine the energetics of nonthermal-electron acceleration in solar noise storms. A new result is obtained for the minimum nonthermal-electron number density required to produce a Langmuir-wave population of sufficient ...

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