IIAP Publications: Recent submissions

  • Ab initio calculation of P,T-odd effects in YbF molecule 
    Nayak, M; Chaudhuri, R. K (Elsevier, 2006-02)
    A fully-relativistic restricted active space (RAS) configuration interaction (CI) approach is employed to compute the P,T-odd interaction constant Wd of the ground (2Σ) state of YbF. A series of increasingly sophisticated ...
  • Variation of Rayleigh wave group velocity dispersion and seismic heterogeneity of the Indian crust and uppermost mantle 
    Mitra, S; Priestley, K; Gaur, V. K; Rai, S. S; Haines, J (Blackwell Publishing, 2006-01)
    We present group velocity dispersion results from a study of regional fundamental mode Rayleigh waves propagating across the Indian region. 1-D, path-averaged dispersion measurements have been made for 1001 source-receiver ...
  • Near-simultaneous Spectroscopic and Broadband Polarimetric Observations of BE Stars 
    Ghosh, K; Iyengar, K. V. K; Ramsey, B. D; Austin, R. A (The American Astronomical Society, 1999-08)
    Near simultaneous optical spectroscopic (on four nights) and broadband linear continuum (B, V, R,and I bands) polarimetric (on seven nights) observations of 29 Be stars were carried out during 1993November-December. The ...
  • A Variational Calculation of Light Hypernuclei 
    Panda, P. K; Sahu, R (World Scientific Publishing Company, 1999-06)
    A nonperturbative variational calculation has been made for the s-shell hypernuclei. Here we dress the Λ- and Σ0- hypernuclei with off-mass shell pion pairs. The analysis replaces the scalar isoscalar potential by quantum ...
  • Comparative morphology of EIT/SOHO images and HeII excitation 
    Venkatakrishnan, P (Kluwer Academic Publishers, 1999-06)
    Morphological differences between coronal images on the one hand, and a Hei image on the other, are used to demonstrate the independence of Heii excitation from coronal radiation. The distribution of magnetic flux is found ...
  • Identification of AlF Molecular Lines in Sunspot Umbral Spectra 
    Bagare, S. P; Balachandra Kumar, K; Rajamanickam, N (Springer, 2006-03)
    High resolution FTS sunspot umbral spectra from NSO/Kitt Peak were used to detect rotational lines due to 11 electronic transitions of the molecule AlF, in the wavelength region 4400 9000 Å. The presence of lines due to ...
  • Principles of Invariance in Radiative Transfer 
    Peraiah, A (Kluwer Academic Publishers, 1999-01)
    We have reviewed the principle of invariance, its applications and its usefulness for obtaining the radiation field in semi-infinite and finite atmospheres. Various laws of scattering in dispersive media and the consequent ...
  • Spectroscopy of the post-AGB star HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García-Lario, P; Manchado, A; Pottasch, S. R (The European Southern Observatory, 1999-06)
    From an analysis of the spectrum (4000 Ä to 8800 Ä) of HD 101584 it is found that most of the neutral and single ionized metallic lines are in emission. The forbidden emission lines of [OI] 6300 Ä and 6363 Ä and [CI] 8727 ...
  • Hall-MHD Turbulence in the Solar Wind 
    Krishan, V; Mahajan, S. M (The Royal Swedish Academy of Sciences, 2005)
    The solar wind is a great paradigm for investigating magnetohydrodynamic turbulence. It is shown that the frame work of Hall magnetohydrodynamics (HMHD), which can support three quadratic invariants and allows nonlinear ...
  • 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 ...

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