IIAP Publications: Recent submissions

  • Separable solutions of force-free spheres and applications to solar active regions 
    Avijeet Prasad; Mangalam, A; Ravindra, B (IOP Publishing, 2014-05-10)
    In this paper, we present a systematic study of the force-free field equation for simple axisymmetric configurations in spherical geometry and apply it to the solar active regions. The condition of separability of solutions ...
  • Orbital signatures from observed light curves of blazars 
    Mangalam, A; Mohan, Prashanth (Indian Academy of Sciences, 2014-04)
    Variability in active galactic nuclei is observed in ultraviolet to X-ray emission based light curves. This could be attributed to orbital signatures of the plasma that constitutes the accretion flow on the putative disk ...
  • Parametric models of the periodogram 
    Mohan, Prashanth; Mangalam, A; Chattopadhyay, S (Indian Academy of Sciences, 2014-04)
    The maximum likelihood estimator is used to determine fit parameters for various parametric models of the Fourier periodogram followed by the selection of the best fit model amongst competing models using the Akaike ...
  • Coronal hole oscillations inferred from the SDO/AIA data 
    Hegde, M; Hiremath, K. M; Doddamani, V. H (Elsevier B.V, 2014-07-15)
    With high temporal resolution (12 sec) of about two hours duration, data of a coronal hole structure in 171°A, 193°A and 211°A taken from SDO/AIA images is considered for examination of oscillations. After estimating the ...
  • Chemical Compositions of RV Tauri Stars and Related Objects 
    Sumangala Rao, S; Giridhar, S (Institute de Astronomia, 2014-04)
    We have undertaken a comprehensive abundance analysis for a sample of relatively unexplored RV Tauri and RV Tauri like stars to further our understanding of post-Asymptotic Giant Branch (post-AGB) evolution. From our study ...
  • Chemical analysis of CH stars – I. Atmospheric parameters and elemental abundances 
    Drisya, K; Goswami, A (Oxford University Press on behalf of the Royal Astronomical Society, 2014-05-11)
    Results from high-resolution spectral analyses of a selected sample of CH stars are presented. Detailed chemical composition studies of these objects, which could reveal abundance patterns that in turn provide information ...
  • Two-dimensional segmentation of small convective patterns in radiation hydrodynamics simulations 
    Lemmerer, B; Utz, D; Hanslmeier, A; Veronig, A; Thonhofer, S; Grimm-Strele, H; Kariyappa, R (EDP Sciences, 2014-03)
    Context. Recent results from high-resolution solar granulation observations indicate the existence of a population of small granular cells that are smaller than 600 km in diameter. These small convective cells strongly ...
  • Contemporary deformation in the Kashmir–Himachal, Garhwal and Kumaon Himalaya: significant insights from 1995–2008 GPS time series 
    Jade, S; Mukul, M; Gaur, V. K; Kumar, K; Shrungeshwar, T. S; Satyal, G. S; Dumka, R. K; Jagannathan, S; Ananda, M. B; Dileep Kumar, P; Banerjee, S (Springer, 2014-06)
    We present new insights on the time-averaged surface velocities, convergence and extension rates along arc-normal transects in Kumaon, Garhwal and Kashmir–Himachal regions in the Indian Himalaya from 13 years of high-precision ...
  • Science with a Wide-Field UV Transient Explorer 
    Sagiv, I; Gal-Yam, A; Ofek, E. O; Waxman, E; Aharonson, O; Kulkarni, S. R; Nakar, E; Maoz, D; Trakhtenbrot, B; Phinney, E. S; J. Topaz, J; Beichman, C; Murthy, J; Worden, S. P (IOP Publishing, 2014-04)
    The time-variable electromagnetic sky has been well-explored at a wide range of wavelengths. In contrast, the ultra-violet (UV) variable sky is relatively poorly explored, even though it offers exciting scientific prospects. ...
  • Residual foreground contamination in the WMAP data 
    Pravabati, C; Park, C (IOP Publishing, 2014)
    We have studied whether there is any residual foreground contamination in the foreground reduced WMAP-7 data for the differential assemblies (DAs) Q, V and W. We have calculated the correlation between the foreground map, ...
  • The evolution of the Net Twist Current and the Net Shear Current in active region NOAA 10930 
    Suthar, Y; Venkatakrishnan, P; Ravindra, B; Jaaffrey, S. N. A (Springer, 2014-07)
    The electric current exists because of the non-potential magnetic field in solar active regions. We present the evolution of net current in the solar active region NOAA 10930 as the sum of shear current and twist current ...
  • Reflection effect in close binaries: effects of reflection on spectral lines 
    Srinivasa Rao, M; Varghese, B. A (Springer, 2014-02)
    Reflection effect phenomenon is studied on the formation of spectral lines in a close binary system when primary component has an extended atmosphere and the secondary component is a point source. Irradiation effect is ...
  • Temporal offsets among solar activity indicators 
    Ramesh, K. B; Vasantharaju, N (Springer, 2014-04)
    Temporal offsets between the time series of solar activity indicators provide important clues regarding the physical processes responsible for the cyclic variability in the solar atmosphere. Hysteresis patterns generated ...
  • Observations of O vi absorption from the superbubbles of the large magellanic cloud 
    Pradhan, A. C; Pathak, A; Murthy, J; Ojha, D. K (Cambridge University Press, 2014-01)
    We have presented the observations of O VI absorption at 1032 Å towards 22 sightlines in 10 superbubbles (SBs) of the Large Magellanic Cloud (LMC) using the data obtained from the Far Ultraviolet Spectroscopic Explorer ...
  • Optical studies of Type IIb SN 2011dh 
    Sahu, D. K; Anupama, G. C; Chakradhari, N. K (Cambridge University Press, 2014-01)
    UBVRI photometry and low resolution optical spectroscopy of the type IIb SN 2011dh in M51 are presented, covering the first year after the explosion. The peak absolute magnitude in V-band of −17.12±0.18 mag indicates SN ...
  • Calibration of a Sky radiometer (Prede) using observations obtained from Hanle and Merak high-altitude stations in Ladakh 
    Shantikumar, N. S; Bagare, S. P; Rajendra, B. S; Campanelli, M; Khatri, P; Dorjey, N (Elsevier B.V, 2014-06-15)
    The present work was carried out to check the performance of a Prede Sky radiometer and the stability of the solar calibration constant (F0s) at two high altitude pristine stations, Hanle and Merak in Ladakh region during ...
  • Optical observations of supernova 2012aw 
    Bose, S; Kumar, B; Sutaria, F. K; Roy, Rupak; Kumar, B; Bhatt, V. K; Chakraborti, S (Cambridge University Press, 2014-01)
    We present optical UBVRI photometric and low-resolution spectroscopic follow-up observations of a type II SN 2012aw in a nearby (~10 Mpc) galaxy M95 during 4 to 270 days post-explosion. The evolution characteristics of ...
  • Evolution of the Type IIb SN 2011fu 
    Pandey, S. B; Kumar, B; Sahu, D. K; Vinko, J; Moskvitin, A. S; Anupama, G. C; Bhatt, V. K; Ordasi, A; Nagy, A; Sokolov, V. V; Sokolova, T. N; Komarova, V. N; Kumar, B; Bose, S; Roy, R; Sagar, R (Cambridge University Press, 2014-01)
    The UBVRI photometric follow-up of SN 2011fu has been initiated a few days after the explosion, shows a rise followed by steep decay in all bands and shares properties very similar to that seen in case of SN 1993J, with a ...
  • The optical photometric and spectroscopic investigation of type IIP supernova 2012A 
    Roy, R; Sutaria, F. K; Bose, S; Johnson, S; Dwarkadas, V; York, B; Kumar, B; Kumar, B; Bhatt, V. K; Chakraborti, S; York, D; Ritchey, A; Saurage, G; Kaiser, M B (Cambridge University Press, 2014-01)
    Supernova 2012A was discovered on 7.39UT, January, 2012 in the nearby galaxy NGC 3239 at an unfiltered magnitude of 14.6 and classified spectroscopically as a Type IIP event. Here, we present the optical photometric and ...
  • Radio observations of a nearby type IIP SN 2012aw 
    Yadav, N; Ray, A; Chakraborti, S; Stockdale, C; Chandra, P; Smith, R; Roy, R; Dwarkadas, V; Sutaria, F. K; Pooley, D; Kumar, B; Bose, S (Cambridge University Press, 2014-01)
    SN 2012AW is a type-IIP supernova which exploded in M95. In this paper we discuss the radio observations of this supernova and model them to determine the important parameters relevant to the explosion and the evolution ...

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