IIAP Publications: Recent submissions

  • Dust properties from GALEX observations of a UV halo around Spica 
    Shalima, P; Murthy, J; Gupta, R (Terra Scientific Publishing Company, 2013-10-24)
    GALEX has detected ultraviolet halos extending as far as 5° around four bright stars (Murthy and Henry, 2011). These halos are produced by scattering of starlight by dust grains in thin foreground clouds that are not ...
  • Segmentation of Coronal Features to Understand the Solar EUV and UV Irradiance Variability 
    Kumara, S. T; Kariyappa, R; Zender, J. J; Giono, G; Delouille, V; Pradeep Chitta, L; Dame, L; Hochedez, J. F; Verbeeck, C; Mampaey, B; Doddamani, V. H (EDP Sciences, 2014-01)
    Context. The study of solar irradiance variability is of great importance in heliophysics, the Earth’s climate, and space weather applications. These studies require careful identifying, tracking and monitoring of active ...
  • Myopic aberrations: Simulation based comparison of curvature and Hartmann Shack wavefront sensors 
    Roopashree, M. B; Vyas, A; Weddell, S. J; Prasad, B. R (Elsevier B.V., 2014-02-01)
    In comparison with a Hartmann Shack wavefront sensor, the curvature wavefront sensor is known for its higher sensitivity and greater dynamic range. The aim of this study is to numerically investigate the merits of using a ...
  • Filament Eruption in Association with Rotational Motion Near the Filament Footpoints 
    Dhara, Sajal Kumar; Ravindra, B; Banyal, R. K (Elsevier B.V., 2014-01)
    The active region magnetic field surrounding the filament plays an important role in filament formation, their evolution and disruption. We investigated a filament eruption that occurred in southern hemisphere of the Sun ...
  • Some Consequences of a Universal Tension Arising from Dark Energy for Structures from Atomic Nuclei to Galaxy Clusters 
    Sivaram, C; Arun, K; Kiren, O. V (Bentham Open, 2013-11-29)
    In recent work, a new cosmological paradigm implied a mass-radius relation, suggesting a universal tension related to the background dark energy (cosmological constant), leading to an energy per unit area that holds for ...
  • A ground based near infra-red detector system 
    Bhattacharya, J. C (Centre of Advanced Study in Astronomy,Osmania University, 1974)
    The problems connected with observations in the near infra-red from ground based locations are discussed. It is shown that optical telescopes located at high stations in India. can be used effectively for near infra-red ...
  • Correlation Trends in the Ground-State Static Electric Dipole Polarizabilities of Closed-Shell Atoms and Ions 
    Singh, Y; Sahoo, B. K; Das, B. P (American Physical Society, 2013-12-03)
    We employ the closed-shell perturbed relativistic coupled-cluster (RCC) theory developed by us earlier [Phys. Rev. A 77, 062516 (2008)] to evaluate the ground-state static electric dipole polarizabilities (αs) of several ...
  • Hard-Core Bosons in a Zig-Zag Optical Superlattice 
    Dhar, A; Mishra, T; Pai, R. V; Mukerjee, S; Das, B. P (American Physical Society, 2013-11-21)
    We study a system of hard-core bosons at half-filling in a one-dimensional optical superlattice. The bosons are allowed to hop to nearest- and next-nearest-neighbor sites. We obtain the ground-state phase diagram as a ...
  • Spectroscopy of Scorpi-Centaurus association 
    Rajamohan, R (Centre of Advanced Study in Astronomy,Osmania University, 1973)
    Rotational velocities and intensities of hydrogen and helium lines for over 40 members of the Scorpio Centaurus association are presented. From the measured equivalent width of Hr and Hd some evidence is found for the ...
  • Assessing landslide susceptibility using Bayesian probability-based weight of evidence model 
    Sujatha, E. R; Kumaravel, P; Rajamanickam, V. G (Springer, 2014-02)
    This study aims to demonstrate the application of a Bayesian probability-based weight of evidence model to map landslide susceptibility in the Tevankarai stream watershed, Kodaikkanal, India. Slope gradient, relief, aspect, ...
  • Site Evaluation Study for the Indian National Large Solar Telescope Using Microthermal Measurements 
    Dhananjay, K (Oxford University Press on behalf of the Royal Astronomical Society, 2014-01-21)
    A microthermal seeing measurement device has been developed in-house to measure the temperature structure function DT(r, h) and the air temperature Tair(h). A pressure sensor, located adjacent to it, measures the average ...
  • Transit of Venus on 2012 June 06: stray light estimation and restoration of Ca-K images of Twin Telescope from Kodaikanal Observatory 
    Prabhu, K; Rangarajan, K. E; Ravindra, B; Sankarasubramanian, K; Selvendran, R; Kumaravel, P (Astronomical Society of India, 2013-09)
    Observations of the transit of Venus were made from the Kodaikanal Observatory on 2012 June 06 in Ca-K wavelengths. Only half of the event was visible from India. We utilized this unique opportunity to compute the contribution ...
  • Indian astronomy and the transits of Venus. 1: The early observations 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2013-11)
    This paper, the first of two, is about sightings and astronomical observations of transits of Venus across the disk of the Sun made from the Indian region. The period covered in this first paper is from ancient times up ...
  • Experimental validation of XRF inversion code for Chandrayaan-1 
    Athiray, P. S; Sudhakar, M; Tiwari, M. K; Narendranath, S; Lodha, G. S; Deb, S. K; Sreekumar, P; Dash, S. K (Elsevier B.V., 2013-12)
    We have developed an algorithm (x2abundance) to derive the lunar surface chemistry from X-ray fluorescence (XRF) data for the Chandrayaan-1 X-ray Spectrometer (C1XS) experiment. The algorithm converts the observed XRF line ...
  • On the Photometric Error Calibration for the Differential Light Curves of Point-like Active Galactic Nuclei 
    Goyal, Arti; Mhaskey, Mukul; Gopal-Krishna; Witta, P. J; Stalin, C. S; Sagar, R (Indian Academy of Sciences, 2013-09)
    It is important to quantify the underestimation of rms photometric errors returned by the commonly used APPHOT algorithm in the IRAF software, in the context of differential photometry of point-like AGN, because of the ...
  • The 2010 outburst and pre-outburst optical spectrum of the recurrent nova U Scorpii 
    Anupama, G. C; Kamath, U. S; Ramaprakash, A. N; Kantharia, N. G; Hegde, M; Mohan, V; Kulkarni, M; Bode, M. F; Eyres, S. P. S; Evans, A; O Brien, T. J (EDP Sciences, 2013-11)
    Aims. We study the evolution of the recurrent nova U Scorpii during its outburst in 2010. Methods. Optical spectroscopic observations of the nova were obtained during 0.83–162.5 days after outburst maximum. Optical ...
  • Photometric identification of objects from Galaxy Evolution Explorer Survey and Sloan Digital Sky Survey 
    Preethi, K; Gudennavar, S. B; Bubbly, S. G; Murthy, J; Brosch, N (Oxford University Press on behalf of the Royal Astronomical Society, 2014-01-01)
    We have used Galaxy Evolution Explorer (GALEX) and Sloan Digital Sky Survey (SDSS) observations to extract seven band photometric magnitudes for over 80 000 objects in the vicinity of the North Galactic Pole. Although these ...
  • Reappearance of McNeil’s Nebula (V1647 Orionis) and its Outburst Environment 
    Ninan, J. P; Ojha, D. K; Bhatt, B. C; Ghosh, S. K; Mohan, V; Mallick, K. K; Tamura, M; Henning, T (IOP Publishing, 2013-12-01)
    We present a detailed study of McNeil's nebula (V1647 Ori) in its ongoing outburst phase starting from 2008 September to 2013 March. Our 124 nights of photometric observations were carried out in optical V, R, I, and ...
  • GSC 2701-2527, A New Multiperiodic High-Amplitude Delta Scuti Variable 
    Kjurkchieva, D. P; Dimitrov, D. P; Ibryamov, S. I.; Srinivasa Rao, M (Astronomical Society of India, 2013-06)
    Our BVI photometric observations reveal that GSC 2701-2527 is a high amplitude ᵟ Scuti star with quite low temperature. The frequency analysis exhibits that it is multiperiodic pulsator. The obtained period ratio f1/ ...
  • Nuclear detonation around compact objects 
    Sivaram, C; Arun, K; Kiren, O. V (Science Publications, 2014)
    In this study we explore the various aspects involved in nuclear detonations occurring around compact objects and the energetics involved. We discuss the possibility of sub-Chandrasekhar white dwarfs detonating due to the ...

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