IIAP Publications: Recent submissions

  • A Study of the Role of Lyβ Fluorescence on O I Line Strengths in Be Stars 
    Blesson, M; Banerjee, D. P. K; Subramaniam, A; Ashok, N. M (IOP Publishing, 2012-07-01)
    The possibility of the Lyβ fluorescence mechanism being operational in classical Be (CBe) stars and thereby contributing to the strength of the O I λ8446 line has been recognized for long. However, this supposition needs ...
  • Three-body on-site interactions in ultracold bosonic atoms in optical lattices and superlattices 
    Singh, M; Dhar, A; Mishra, T; Pai, R. V; Das, B. P (American Physical Society, 2012-05)
    The Mott-insulator-superfluid transition for ultracold bosonic atoms in an optical lattice has been extensively studied in the framework of the Bose-Hubbard model with two-body on-site interactions. In this paper, we analyze ...
  • Theoretical aids in screening candidates for atomic clocks: Illustration for Yb II 
    Chaudhuri, R. K; Freed, K. F; Chattopadhyay, S; Mahapatra, U. S (IOP Publishing, 2012-04)
    Highly accurate electronic-structure calculations for metastable electronic excited states are needed to supplement scant experimental data in screening possible systems for new higher-precision atomic clocks. We test the ...
  • The location of solar metric type ii radio bursts with respect to the associated coronal mass ejections 
    Ramesh, R; Anna Lakshmi, M; Kathiravan, C; Gopalswamy, N; Umapathy, S (IOP Publishing, 2012-06-20)
    Forty-one solar type II radio bursts located close to the solar limb (projected radial distance rlesssim 0.8Rbigdot) were observed at 109 MHz by the radioheliograph at the Gauribidanur observatory near Bangalore during the ...
  • Properties of umbral dots from stray light corrected hinode filtergrams 
    Louis, R. E; Mathew, S. K; Bellot Rubio, L. R; Kiyoshi, I; Ravindra, B; Raja Bayanna, A (IOP Publishing, 2012-06-20)
    High-resolution blue continuum filtergrams from Hinode are employed to study the umbral fine structure of a regular unipolar sunspot. The removal of scattered light from the images increases the rms contrast by a factor ...
  • Star formation in bulgeless late-type galaxies: clues to their evolution 
    Mousumi Das; Sengupta, C; Ramya, S; Misra, K (Wiley-Blackwell, 2012-07)
    We present Giant Meterwave Radio Telescope 1280-MHz radio continuum observations and follow-up optical studies of the disc and nuclear star formation in a sample of low-luminosity bulgeless galaxies. The main aim is to ...
  • SN2007rw- A Type IIL Supernova 
    Arora, S; Sahu, D. K; Anupama, G. C (Astronomical Society of the Pacific, 2011-12)
    We present BVRI photometry and medium resolution spectroscopy of the supernova SN2007rw during ˜ 1 week to ˜ 7 months after discovery. This supernova was classified as a type IIb event, however, based on our analysis we ...
  • Spectroscopic monitoring of the symbiotic star BX monocerotis 
    Anupama, G. C; Kamath, U. S; Gurugubelli, U. K; Mikołajewska, J (Vilnius University and the Lithuanian Astronomical Union, 2012)
    Low resolution optical spectra of the symbiotic star BX Monocerotis in the 3500--9000 A range obtained during 1999--2010 are described. The spectrum of BX Mon at all phases is dominated by the cool component, with a red ...
  • Panchromatic observations of the textbook grb 110205a: constraining physical mechanisms of prompt emission and afterglow 
    Zheng, W; Shen, R. F; Sakamoto, T; Beardmore, A. P; De Pasquale, M; Wu, X. F; Gorosabel, J; Urata, Y; Sugita, S; Zhang, B; Pozanenko, A; Nissinen, M; Sahu, D. K; Im, M; Ukwatta, T. N; Andreev, M; Klunko, E; Volnova, A; Akerlof, C. W; Anto, P; Barthelmy, S. D; Breeveld, A; Carsenty, U; Castillo-Carrion, S; Castro-Tirado, A. J; Chester, M. M; Chuang, C. J; Cunniffe, R; De Ugarte Postigo, A; Duffard, R; Flewelling, H; Gehrels, N; Guver, T; Guziy, S; Hentunen, V. P; Huang, K. Y; Jelinek, M; Koch, T. S; Kubanek, P; Kuin, P; McKay, T. A; Mottola, S; Oates, S. R; O'Brien, P; Ohno, M; Page, M. J; Pandey, S. B; Perez del Pulgar, C; Rujopakarn, W; Rykoff, E; Salmi, T; Sanchez-Ramirez, R; Schaefer, B. E; Sergeev, A; Sonbas, E; Sota, A; Tello, J. C; Yamaoka, K; Yost, S. A; Yuan, F (IOP Publishing, 2012-06-01)
    We present a comprehensive analysis of a bright, long-duration (T /sub90/ ~ 257 s) GRB 110205A at redshift z = 2.22. The optical prompt emission was detected by Swift/UVOT, ROTSE-IIIb, and BOOTES telescopes when the gamma-ray ...
  • Two-dimensional Monte Carlo radiative transfer modelling of the disc-shaped secondary of Epsilon Aurigae 
    Muthumariappan, C; Parthasarathy, M (Wiley Blackwell, 2012-07)
    We present two-dimensional Monte Carlo radiative transfer models for the disc of the eclipsing binary Epsilon Aurigae by fitting its spectral energy distribution (SED) from optical to far-infrared (IR) wavelengths. We also ...
  • Dynamics of the Solar Magnetic Bright Points Derived from Their Horizontal Motions 
    Pradeep Chitta, L; van Ballegooijen, A. A; Rouppe van der Voort, L; DeLuca, E. E; Kariyappa, R (IOP Publishing, 2012-06-10)
    The subarcsecond bright points (BPs) associated with the small-scale magnetic fields in the lower solar atmosphere are advected by the evolution of the photospheric granules. We measure various quantities related to the ...
  • TeV blazar variability: the firehose instability? 
    Subramanian, P; Shukla, A; Becker, P. A (Wiley-Blackwell, 2012-06)
    Recently observed minute-time-scale variability of blazar emission at TeV energies has imposed severe constraints on jet models and TeV emission mechanisms. We focus on a robust jet instability to explain this variability. ...
  • Storing light in active optical waveguides with single-negative materials 
    Lu, W. T; Huang, Y. J; Casse, B. D. F; Banyal, R. K; Sridharb, S (American Institute of Physics, 2010-05-24)
    We show that a nonresonant planar waveguide consisting of conventional dielectric cladded with single-negative materials supports degenerate propagating modes for which the group velocity and total energy flow can be zero ...
  • Multiwavelength study of the TeV blazar Mrk 421 during a giant flare 
    Shukla, A; Chitnis, V. R; Vishwanath, P. R; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Britto, R. J; Prabhu, T. P; Saha, L; Singh, B. B (EDP Sciences, 2012-05)
    Aims. The nearby (z = 0.031) TeV blazar Mrk 421 was reported to be in a high state of flux activity since November, 2009. We aim to investigate possible changes in the physical parameters of Mrk 421 during its high state ...
  • Blend lines in the polarized spectrum of the Sun 
    Sowmya, K; Nagendra, K. N; Sampoorna, M (Wiley-Blackwell, 2012-07)
    Blend lines form an integral part of the theoretical analysis and modeling of the polarized spectrum of the Sun. Their interaction with other spectral lines needs to be explored and understood before we can properly use ...
  • Application of relativistic Fock-space coupled-cluster theory to study Li and Li-like ions in plasma 
    Madhulita, Das; Das, M; Chaudhuri, R. K; Chattopadhyay, S (American Physical Society, 2012-04)
    The ionization potentials, transition energies, and oscillator strengths of Li and Li-like C3+ and Al10+ are computed at different plasma environments with the Fock-space multireference coupled-cluster theory to examine ...
  • Bose-Hubbard model in a strong effective magnetic field: Emergence of a chiral Mott insulator ground state 
    Dhar, A; Maji, M; Mishra, T; Pai, R. V; Mukerjee, S; Paramekanti, A (American Physical Society, 2012-04)
    Motivated by experiments on Josephson junction arrays, and cold atoms in an optical lattice in a synthetic magnetic field, we study the “fully frustrated” Bose-Hubbard model with half a magnetic flux quantum per plaquette. ...
  • Primordial Rotation of the Universe, Hydrodynamics, Vortices and Angular Momenta of Celestial Objects 
    Sivaram, C; Arun, K (Bentham Open, 2012-03)
    The origin of rotation or spin of objects, from stars to galaxies, is still an unanswered question. Even though there are models which try to explain this, none of them can account for the initial impulse that gave rise ...
  • J-state interference signatures in the second solar spectrum. Modeling the Cr I triplet at 5204-5208 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Sampoorna, M; Ramelli, R; Anusha, L. S (EDP Sciences, 2012-05)
    The scattering polarization in the solar spectrum is traditionally modeled with each spectral line treated separately, but this is generally inadequate for multiplets where J-state interference plays a significant role. ...
  • TW Hya: Spectral Variability, X-Rays, and Accretion Diagnostics 
    Dupree, A. K; Brickhouse, N. S; Cranmer, S. R; Luna, G. J. M; Schneider, E. E; Bessell, M. S; Bonanos, A; Crause, L. A; Lawson, W. A; Mallik, S. V; Schuler, S. C (IOP Publishing, 2012-05-01)
    The nearest accreting T Tauri star, TW Hya was intensively and continuously observed over ~17 days with spectroscopic and photometric measurements from four continents simultaneous with a long segmented exposure using the ...

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