IIAP Publications: Recent submissions

  • Hanle effect with angle-dependent partial redistribution 
    Nagendra, K. N; Frisch, H; Faurobert, M (The European Southern Observatory, 2002-11)
    The polarized line transfer equation for the Hanle effect is solved in the framework of an exact partial frequency redistribution (PRD) theory developed by Bommier (1997a,b). In that theory the effect of collisions on the ...
  • On the absolute magnitude of V482 Cygni, an R Coronae Borealis star 
    Kameswara Rao, N; Lambert, D. L (Astronomical Society of the Pacific, 1993-06)
    An identification of V482 Cygni, a R Coronae Borealis star, with a quadruple system containing a K5 III star is rejected. High-resolution spectra show that the radial velocity of V482 Cyg and the K5 III star differ by 35 ...
  • Effects of magnetic shear, spot, and plage rotation on prominence evolution 
    Rausaria, R. R; Gupta, S. S; Selvendran, R; Raman, K. S; Singh, J (Kluwer Academic Publishers, 1993-08)
    We have studied the evolution of two dark H-alpha filaments as prominences during their disk passage from February 12 to February 19, 1992 and from March 6 to March 17, 1992, using Kodaikanal Observatory H-alpha and Ca II ...
  • The Nebular Remnant and Quiescent Spectrum of Nova Gk-Persei 
    Anupama, G. C; Prabhu, T. P (Royal Astronomical Society, 1993-07-15)
    CCD images of the nebular shell of the old nova GK Per in [N II] and [O III] emission lines, and also the quiescent spectrum in the optical region, are presented. Proper motion measurements of the knots in [N II]over the ...
  • Polarisation in A-type stars with circumstellar shells 
    Bhatt, H. C (European Southern Observatory, 1996-12)
    We present the results of optical linear polarisation measurements of about 30 A-type stars that are known to be either Ae/A shell stars or have shown anomalous emission in the infrared. Compared with the general population ...
  • Azimuthal structures in the wind and chromosphere of the Herbig AE star AB Aurigae. Results from the MUSICOS 1992 campaign 
    Boehm, T; Catala, C; Donati, J. F; Welty, A; Baudrand, J; Butler, C. J; Carter, B; Collier-Cameron, A; Czarny, J; Foing, B; Ghosh, K; Hao, J; Houdebine, E; Huang, L; Jiang, S; Neff, J. E; Rees, D; Semel, M; Simon, T; Talavera, A; Zhai, D; Zhao, F (European Southern Observatory, 1996-12)
    The observations of the MUSICOS 1992 campaign concerned three scientific programs, among which was the study of azimuthal structures in the wind and chromosphere of the pre-main sequence Herbig Ae star AB Aur. The He I ...
  • UBVR Polarimetry of the Peculiar R-Coronae Star V854-CENTAURI 
    Kameswara Rao, N; Raveendran, A. V (European Southern Observatory, 1993-07)
    We present UBVR polarimetry V 854 Cen obtained on four nights during February 1991-March 1992. Two sets of measurements are close to two nearby light maxima and the other two during the declines when the star was around 4 ...
  • Optical Emission Bands in the Spectrum of the R-Coronae and V854-CENTAURI at Minimum 
    Kameswara Rao, N; Lambert, D. L (Royal Astronomical Society, 1993-08-01)
    Several unidentified broad emission features, previously seen only in the spectrum of the nebulosity in the Red Rectangle, have been observed in a spectrum of the R CrB star V854 Cen taken in a deep minimum. Similarities ...
  • Polarized resonance line transfer with collisional redistribution 
    Mohan Rao, D (European Southern Observatory, 1993-07)
    In this paper we study the effect of depolarizing collisions on resonance line polarization in the absence of magnetic fields. The role of γ, the coherence parameter is investigated in determining the percentage of ...
  • Observations of the Rosette Nebula using the Decameter Wave Radio Telescope at Gauribidanur 
    Deshpande, A. A; Shevgaonkar, R. K; Sastry, Ch. V (D. Reidel Publishing Co., 1984-07)
    A map of Rosette Nebula in continuum absorption is made at 34.5 MHz using the Decameter Wave Radio Telescoe at Gauribidanur, India, with a resolution of 26×40, is presented. These observations are combined with the 2700 ...
  • Electric dipole and quadrupole transition amplitudes for Ba+ using the relativistic coupled-cluster method 
    Gopakumar, G; Merlitz, H; Chaudhuri, R. K; Das, B. P; Mahapatra, U. S; Mukherjee, D (The American Physical Society, 2002-09)
    We present our calculations of the electric dipole and quadrupole matrix elements for transitions between low-lying bound states of Ba1 that are relevant for parity nonconservation studies using the relativistic coupled-cluster ...
  • Photometric Variability of Four Coronally Active Stars 
    Pandey, J. C; Singh, K. P; Sagar, R; Drake, S. A (Indian Academy of Sciences, 2002-03)
    We present photometric observations of four stars that are optical counterparts of soft X-ray/EUV sources, namely 1ES 0829+15.9, 1ES0920-13.6, 2RE J110159+223509 and 1ES 1737+61.2. We have discovered periodic variability ...
  • Studies on the E2-transition in CoXVII 
    Ray, H (EDP Sciences, 2002-09)
    The spectrum of the solar corona, plasma spectra, astrophysical objects and fusion devices exhibit forbidden lines in alkali-like ions. Ions belonging to the iron group are particularly important in this respect. More ...
  • Fading of light maximum and linear polarization variation in the carbon Mira R Leporis 
    Raveendran, A. V (Royal Astronomical Society, 2002-11)
    Polarimetry of R Lep obtained over the years 1991-2002 is presented. During this period the star underwent an episode of fading of the brightness at light maximum, after an interval of about 35 yr. An analysis of the data ...
  • Spectroscopic Studies of the Solar Corona III. Density Diagnostics Using the Infrared Lines of Fe XIII 
    Singh, J; Sakurai, Takashi; Ichimoto, K; Takeda, Aki (Astronomical Society of Japan, 2002)
    We have obtained spectrographic observations of several coronal regions in three emission lines (6374Å [Fe X ], 10747Å [Fe XIII ], and 10798Å [Fe XIII ]) simultaneously. The 25-cm coronagraph at Norikura Observatory and ...
  • Studies on E2 Transition in the Na-like Highly Stripped Ion Fe XVI 
    Ray, H (The American Astronomical Society, 2002-11)
    The spectrum of the solar corona and plasma spectra in astrophysical objects and fusion devices exhibit forbidden lines in alkali-like ions. Ions belonging to the iron group are particularly important in this respect. The ...
  • Upper Limits on O VI Emission from Voyager Observations 
    Murthy, M (Indian Academy of Sciences, 2002-06)
    We have examined 426 Voyager fields distributed across the sky for O VI (1032/1038 Å) emission from the Galactic diffuse interstellar medium. No such emission was detected in any of our observed fields. Our most constraining ...
  • Spectroscopic Studies of the Solar Corona II. Properties of Green and Red Emission Lines in Open and Closed Coronal Structures 
    Singh, J; Sakurai, T; Ichimoto, Kiyoshi; Suematsu, Yoshinori; Takeda, Aki (Astronomical Society of Japan, 2002-10)
    We obtained profiles of the green (Fe <FONT SIZE="-2">XIV 5303Å) and red (Fe <FONT SIZE="-2">X 6374Å) emission lines simultaneously on 1998 July18-19 for about 4hours with a cadence of 10minutes, covering an area of about ...
  • Multi-band Observations of Gamma Ray Bursts 
    Bhargavi, S. G (Indian Academy of Sciences, 2002-06)
    This talk focuses on the various aspects we learnt from multiband observations of GRBs both, before and during the afterglow era. A statistical analysis to estimate the probable redshifts of host galaxies using the luminosity ...
  • Detection of Zinc in the Very Metal-Poor Post-AGB Star HR 4049 
    Takeda, Yoichi; Parthasarathy, M; Aoki, W; Ita, Yoshifusa; Nakada, Yoshikazu; Izumiura, Hideyuki; Noguchi, Kunio; Takada-Hidai, Masahide; Sato, B; Tajitsu, Akito; Honda, Satoshi; Kawanomoto, Satoshi; Ando, Hiroyasu; Karoji, Hiroshi (Astronomical Society of Japan, 2002-10-25)
    We report on the detection of two Zn I lines at 4722.15Å and 4810.53Å in the high-quality spectrum of the very metal-poor post-AGB star HR 4049, which was obtained with the High Dispersion Spectrograph attached to the ...

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