IIAP Publications: Recent submissions

  • Stellar contents and star formation in the young star cluster Be 59 
    Pandey, A. K; Sharma, S; Ogura, K; Ojha, D. K; Chen, W. P; Bhatt, B. C; Ghosh, S. K (Blackwell Publishing, 2008-01)
    We present UBV Ic CCD photometry of the young open cluster Be 59 with the aim to study the star formation scenario in the cluster. The radial extent of the cluster is found to be ~10 arcmin (2.9 pc). The interstellar ...
  • A three-dimensional automated classification scheme for the TAUVEX data pipeline 
    Bora, A; Gupta, R; Singh, H. P; Murthy, J; Mohan, Rekhesh; Duorah, K (Blackwell Publishing, 2008-02)
    In order to develop a pipeline for automated classification of stars to be observed by the Tel-Aviv University Ultra-Violet Experiment (TAUVEX) ultraviolet space telescope, we employ an artificial neural network (ANN) ...
  • Theoretical spectroscopic studies of the atomic transitions and lifetimes of low-lying states in Ti IV 
    Mandal, S; Dixit, G; Sahoo, B. K; Chaudhuri, R. K; Majumder, S (Institute of Physics, 2008-03)
    The astrophysically important electric quadrupole (E2) and magnetic dipole (M1) transitions for the low-lying states of triply ionized titanium (Ti IV) are calculated very accurately using a state-of-the-art all-order ...
  • Mean-field dynamo in partially ionized plasmas – I 
    Krishan, V; Gangadhara, R. T (Blackwell Publishing, 2008-04)
    There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma, the magnetic induction is subjected to the ambipolar ...
  • On the interchange instability of solar magnetic flux tubes. II. The influence of energy transport effects 
    Bunte, M; Hasan, S. S; Kalkofen, W (European Southern Observatory, 1993-06)
    We examine the interchange instability of thin photospheric magnetic flux tube models which satisfy both force and energy balance with their surroundings. The stability of the tubes is independent of the efficiency of ...
  • Earth's equatorial ionosphere and the heliospheric current sheet 
    Sastri, J. H (D. Reidel Publishing Company, 1986-05)
    Evidence is presented to show that during epochs of high sunspot activity, the duration of manifestation of equatorial spread-F (ESF) irregularities in the Earth's equatorial ionosphere undergoes a systematic modulation ...
  • R Coronae Borealis stars at minimum light - UW Cen 
    Kameswara Rao, N; Reddy, B. E; Lambert, D. L (Blackwell Publishing, 2004-12)
    Two high-resolution optical spectra of the R Coronae Borealis (R CrB) star UW Cen in decline are discussed. A spectrum from mid-1992 when the star had faded by 3 mag shows just a few differences with the spectrum at maximum ...
  • 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 ...

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