IIAP Publications: Recent submissions

  • High-resolution spectroscopy of the high galactic latitude RV Tauri star CE Virginis 
    Kameswara Rao, N; Reddy, B. E (Blackwell Publishing, 2005-02)
    Analysis of the surface composition of the suspected cool RV Tauri star CE Virginis shows no systematic trend in depletions of elements with respect to condensation temperature. However, there is a significant depletion ...
  • High resolution spectroscopy of the hot post-AGB stars IRAS 13266-5551 (CPD-55 5588) and IRAS 17311-4924 (Hen3-1428) 
    Sarkar, G; Parthasarathy, M; Reddy, B. E (EDP Sciences, 2005-03)
    High resolution spectra covering the wavelength range 4900 Å to 8250 Å of the hot post-AGB stars IRAS 13266-5551 (CPD-55 5588) and IRAS 17311-4924 (Hen3-1428) reveal absorption lines of C II, N II, O II, Al III, Si III and ...
  • Three Li-rich K Giants: IRAS 12327-6523, 13539-4153, and 17596-3952 
    Reddy, B. E; Lambert, D. L (University of Chicago Press, 2005-06)
    We report on spectroscopic analyses of three K giants previously suggested to be Li-rich: IRAS 12327-6523, 13539-4153, and 17596-3952. High-resolution optical spectra and the LTE model atmospheres are used to derive the ...
  • Abundance Analyses of Field RV Tauri Stars. VI. An Extended Sample 
    Giridhar, S; Lambert, D. L; Reddy, B. E; Gonzalez, G; Yong, D (University of Chicago Press, 2005-07)
    An abundance analysis is presented and discussed for a sample of 14 RV Tauri stars. The present abundance data and those from our previous papers and by other workers are combined in an attempt to further understanding of ...
  • Distribution of planetary nebulae perpendicular to the disk 
    Mallik, D. C. V; Chatterjee, S (International Astronomical Union, 1993)
  • Abundance analysis of the cool extreme helium star LSS3378 
    Pandey, G; Reddy, B. E (Blackwell Publishing, 2006-07)
    Abundance analysis of the cool extreme helium (EHe) star LSS 3378 is presented. The abundance analysis is done using local thermodynamic equilibrium (LTE) line formation and LTE model atmospheres constructed for EHe ...
  • Bluer colour of UX Arietis at fainter visual magnitudes 
    Rosario, M. J; Raveendran, A. V; Mekkaden, M. V (EDP Sciences, 2007-11)
    Aims.The RS CVn star UX Ari appears bluer when it is fainter, which is unusual for a spotted star; we aim to resolve this unusual behaviour of the object. Also the data available in the literature indicate that the mean V ...
  • Photometric, spectroscopic and polarimetric variability of the weak-emission T Tauri star HD 288313 
    Mekkaden, M. V; Muneer, S; Raveendran, A. V (Blackwell Publishing, 2007-07)
    Photometric observations over three seasons show HD 288313 to be a light variable with a 2.2636-d period. The observed V amplitudes lie in the range of 0.06–0.15 mag. The star showed appreciable changes in the brightness ...
  • An Evaluation of Possible Mechanisms for Anomalous Resistivity in the Solar Corona 
    Singh, K. A. P; Subramanian, P (Springer Netherlands, 2007-07)
    A wide variety of transient events in the solar corona seem to require explanations that invoke fast reconnection. Theoretical models explaining fast reconnection often rely on enhanced resistivity. We start with data ...
  • Abundances in planetary nebulae: Hb 5 
    Pottasch, S. R; Surendiranath, R (EDP Sciences, 2007-01)
    The ISO spectra of the bilobal planetary nebula Hb 5 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition ...
  • Parsec-scale magnetic field structures in HEAO-1 BL Lacs 
    Kharb, P; Gabuzda, D; Shastri, P (Blackwell Publishing, 2008-02)
    We present very long baseline interferometry polarization images of an X-ray-selected sample of BL Lacertae objects belonging to the first HEAO-1 and the ROSAT–Green Bank (RGB) surveys. These are primarily high-energy-peaked ...
  • Gaseous outflows in seyferts and unification 
    Shastri, P; Hutchings, J; Murthy, J; Wills, B. J (Astronomical Society of the Pacific, 2006-06)
    We present our results from FUSE observations of Seyfert galaxies of type 2 (Sy 2). We attempt to contrast the properties of the emission lines and absorbing outflows in Sy 1s and 2s in the framework of Unification. We ...
  • Different Angles on Active Galaxies: Where are We with Regard to Unification? 
    Shastri, P (Astronomical Society of the Pacific, 2007-10)
    With the realization that orientation plays a dominant role in the appearance of active galaxies, much of AGN research has been worked into the operating framework of the �unified scheme,� wherein active galaxies are broadly ...
  • The Equatorial Background Solar Corona during Solar Minimum 
    Ramesh, R; Nataraj, H. S; Kathiravan, C; Sastry, Ch. V (University of Chicago Press, 2006-09)
    We report two-frequency (51 and 77 MHz) radio observations of the equatorial brightness distribution of the “undisturbed” solar corona, close to the minimum between sunspot cycles 22 and 23. The contributions from different ...
  • The Post-Coronal Mass Ejection Solar Atmosphere and Radio Noise Storm Activity 
    Kathiravan, C; Ramesh, R; Nataraj, H. S (University of Chicago Press., 2007-02)
    We carried out a statistical study of solar radio noise storms whose onset was in the aftermath of coronal mass ejections (CMEs) that occurred during 1997–2004, the first half of present solar cycle 23. The work is an ...
  • Brazilian Decimetre Array (Phase-1): Initial solar observations 
    Ramesh, R; Sawant, H. S; Cecatto, J. R; Faria, C; Fernandes, F. C. R; Kathiravan, C; Suryanarayana, G. S (Elsevier B.V, 2007-02)
    An East–West one-dimensional radio interferometer array consisting of 5 parabolic dish antennas has been set-up at Cachoeira Paulista, Brazil (Longitude: 45°0′20″W, Latitude: 22°41′19″S) for observations of Sun and some ...
  • Cylindrical Hall – MHD Waves: A Nonlinear Solution 
    Krishan, V; Varghese, B. A (Springer Netherlands, 2008-01)
    The exact nonlinear cylindrical solution for incompressible Hall – magnetohydrodynamic (HMHD) waves, including dissipation, essentially from electron – neutral collisions, is obtained in a uniformly rotating, weakly ionized ...
  • Irregular Singularity of the Magnetorotational Instability in a Keplerian Disk 
    Furukawa, M; Yoshida, Z; Hirota, M; Krishan, V (University of Chicago Press, 2007-04)
    The center of a Keplerian disk is an irregular singularity for the eigenfunctions of magnetorotational instabilities. The system is studied using the small-radius approximation, which by no means implies that the analysis ...
  • Spatial damping of compressional MHD waves in prominences 
    Singh, K. A. P; Dwivedi, B. N; Hasan, S. S (EDP Sciences, 2007-10)
    Aims.We study the spatial damping of linear compressional MHD waves in a homogeneous, isothermal, and unbounded prominence. Methods.We derive a general dispersion relation invoking the Newtonian radiation and turbulent ...
  • CCD photometry of the globular cluster NGC 5466. RR Lyrae light-curve decomposition and the distance scale 
    Arellano Ferro, A; Rojas López, V; Giridhar, S; Bramich, D. M (Blackwell Synergy, 2008-03)
    We report the results of CCD V and r photometry of the globular cluster NGC 5466. The difference image analysis technique adopted in this work has resulted in accurate time-series photometry even in crowded regions of the ...

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