IIAP Publications: Recent submissions

  • Sensors for the high resolution astronomical imaging 
    Saha, S. K (Macmillan Publishers India Ltd., 2008)
    Optical interferometry with single aperture, as well as with multi-aperture require high quality sensor that enables to obtain snap shots with a very fast time resolution of the order of (i) frame integration of 50 Hz, or ...
  • Speckle Imaging: a boon for astronomical observations 
    Saha, S. K (Centre for Space Physics, 2003)
    The speckle imaging is a photographic technique that resolves objects viewed through severely distorted media. The results are insensitive to the errors caused by apparent size of the isoplanatic patch and the telescope ...
  • Toward a revival of stellar intensity interferometry 
    LeBohec, S; Barbieri, C; Willem-Jan, de W; Dravins, D; Feautrier, P; Foellmi, C dric; Glindemann, A; Hall, J; Holder, J; Holmes, R; Kervella, P; Kieda, D; Le Coarer, E; Lipson, S; Malbet, F; More, S. B; Nu ez, P; Ofir, A; Ribak, E; Saha, S. K; Schoeller, M; Zhilyaev, B; Zinnecker, H (SPIE The International Society for Optical Engineering, 2008)
    Building on technological developments over the last 35 years, intensity interferometry now appears a feasible option by which to achieve diffraction-limited imaging over a square-kilometer synthetic aperture. Upcoming ...
  • High resolution imaging by employing passive and active approaches 
    Saha, S. K (Anita Publications, 2002)
  • Aperture synthesis in optical astronomy; the current status 
    Saha, S. K (Invertis, Inc, 2007)
    A milestone in observational astronomy was achieved when the interferometric fringes of Lyrae (Vega) in the visible band were obtained in July 1974, by A. Labeyrie from an interferometer, called Interferometre a deux ...
  • Micro-fluctuations of fried's parameter (ro) 
    Saha, S. K; Yeswanth, L (Anita Publications, 2004)
    The atmospheric coherence is a highly variable parameter depending upon the high velocity wind. The size of the atmospheric coherence length widely known as, Fried's parameter, ro, has been computed during night at the ...
  • Detectors for the astronomical applications 
    Saha, S. K (Macmillan Publishers India Ltd., 2009)
    Astronomical observations are dependent on focal-plane instruments, and detectors continue to play a key role. The detector technology is evolving rather fast with the large-format CMOS and CCD array mosaics, electron-multiplying ...
  • Design of a mammary gland specific gamma imaging system (MSGIS) 
    Sarbajit, P; Bhattacharjee, T; Saha, S. K (Macmillan Publishers India Ltd., 2009)
    In conventional X-ray mammography, the presences of a small lesion/tumor at the early stage of cancer are not definitely detected because of the complex anatomy of the breast tissues. On the other hand, the low resolution ...
  • FPGA Based ASM implementation for CCD Camera Controller 
    Srinivasan, R; Anupama, K; Suneeta; Saha, S. K; Rao, A (MacMillan Publishers Ind. Ltd, 2009)
    A general purpose CCD controller that can address any CCD, has been developed at the Indian Institute of Astrophysics. It is based on a Digital Signal Processor (DSP) chip, Motorola DSP 56002 for implementing essential ...
  • Present trends in stellar interferometry 
    Saha, S. K (2009)
    Long baseline interferometry in optical/IR band offer the possibilities for direct measurement of all the basic physical parameters for a large number of stars. Soon after the success of obtaining interferometric fringes ...
  • Laser guide artificial star for high resolution imaging 
    Saha, S. K (Indian Association for the Cultivation of Science, 2006)
    A large telescope encodes the information about the source, but unable to get the di raction-limited informations. Due to the inhomogeneity of the propagating medium that carries the light to the Earth's surface, the ...
  • Auto-correlation of Binary stars 
    Saha, S. K; Maitra, D (Indian Association for the Cultivation of Science, 2001)
    Speckle interferometric technique is used to record a series of short exposure images of several close binary stars with sub-arcsecond separation through a narrow band filter centred at H$\alpha$ at the Cassegrain focus ...
  • Kodaikanal Observatory, Kodaikanal. Report for the year ending 1969 December 31 
    Bappu, M. K. V (Royal Astronomical Society, 1970-09)
  • Hydrogen-deficient nature of Z UMi 
    Goswami, A; Kameswara Rao, N; Gonzalez, G; Lambert, D. L (Astronomical Society of the Pacific, 1996)
  • Spectrum of S Aps at deep minimum 
    Kameswara Rao, N; Goswami, A; Smith, V. V; Lambert, D. L (Astronomical Society of the Pacific, 1996)
  • Stigmatic mounting of holographic plane grating 
    Singh, M (Tipografia Baccini and Chiappi, 1977-10)
    A Stigmatic mounting of holographic plane has been proposed and its properties have been studied theoretically. In this mounting the observation is to be made about a normal direction and different regions of the spectrum ...
  • 100 years of photon-counting: the quest for the perfect eye 
    Morel, S; Saha, S. K (Anita Publications, 2005)
  • Comparative studies of dipole polarizabilities in Sr+ , Ba+ , and Ra+ and their applications to optical clocks 
    Sahoo, B. K; Timmermans, R. G. E; Das, B. P; Mukherjee, D (The American Physical Society, 2009-12)
    Static dipole polarizabilities are calculated in the ground and metastable states of Sr+, Ba+ and Ra+ using the relativistic coupled-cluster method. Trends of the electron correlation effects are investigated in these ...
  • The chemical composition and circumstellar environment of the variable star QY sge 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of the Pacific, 2004)
    Chemical composition studies of the variable star QY Sge show abundance anomalies suggestive of the pattern exhibited by the warmer RV Tau variables. Abundance analysis indicates a near-solar atmosphere with highly condensable ...
  • Magnetic field induced metal-insulator transition in a one-dimensional chain: application to neutron star atmospheres 
    Chatterjee, S (Kluwer Academic Publishers, 1989-12)
    It is shown that, in the non-interacting limit, a one-dimensional metallic system has a transition to an insulating phase, in presence of external magnetic field H, if mu(B)H is greater than E(B), where mu(B) is the Bohr ...

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