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Browsing by Author "Saha, S. K"

Browsing by Author "Saha, S. K"

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  • The rotating envelope of the hot star gamma Cassiopeiae resolved by optical interferometry 
    Mourard, D; Bosc, I; Labeyrie, A; Saha, S. K (Nature Publishing Group, 1989-11)
    CERTAIN hot stars, belonging to the Be class, may have an envelope of hydrogen gas, possibly in the form of a rotating disk or spheroidal shell. Other models involve elliptical rings or close binary systems where the Roche ...
  • 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 ...
  • Simulation of multiple aperture synthesis 
    Saha, S. K; Jayarajan, A. P; Rangarajan, K. E; Chatterjee, S (European Space Observatory, 1988)
    In view of the importance of multiple aperture synthesis in optical astronomy, a computer simulation of the same is demonstrated. The fringe patterns obtained through the aperture mask of six and nine holes arranged ...
  • A Speckle Experiment during the Partial Eclipse 
    Saha, S. K; Nagabhushana, B. S; Ananth, A. V; Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1997)
    An experiment for the speckle reconstruction of solar features was developed for observing the partial eclipse of the sun as viewed from Bangalore on October 24, 1995. No data could be obtained because of cloudy sky but ...
  • Speckle imaging with hypertelescopes 
    Surya, A; Saha, S. K; Labeyrie, A (Oxford University Press on behalf of the Royal Astronomical Society, 2014-09-01)
    Optical stellar interferometers have demonstrated milliarcsecond resolution with few apertures spaced hundreds of metres apart. To obtain rich direct images, many apertures will be needed, for a better sampling of the ...
  • 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 ...
  • Speckle interferometric observations of close binary stars 
    Saha, S. K; Chinnappan, V; Yeshwanth, L; Anbazhagan, P (Astronomical Society of India, 2002-09)
    Speckle interferometric technique is employed to record a series of hundreds of short-exposure images of several close binary stars with sub-arc second separation through a narrow band filter at the Cassegrain focus of ...
  • Speckle interferometric observations of the collision of comet Shoemaker-Levy 9 with Jupiter 
    Saha, S. K; Rajamohan, R; Vivekananda Rao, P; Sunder, G. S; Swaminathan, R; Lokanandham, B (Astronomical Society of India, 1997)
    Speckle interferometric technique has been used to obtain a series of short exposure images of the collision of comet Shoemaker-Levy 9 with Jupiter during the period of July 17-24, 1994 using the Nasmyth focus of 1.2 meter ...
  • Speckle interferometry at IIA and elsewhere: An overview 
    Venkatakrishnan, P; Saha, S. K; Shevgaonkar, R. K (Tata Institute of Fundamental Reserach, 1988)
    The technique of speckle interferometry, used for compensating the blurring effects of the earth's atmosphere, is briefly outlined. The achievements of this technique by different groups in the world are listed. We then ...
  • Speckle interferometry technique for astronomical observations 
    Saha, S. K (The Optical Society of India, 2003)
  • SS 433: results of a recent multiwavelength campaign 
    Chakrabarti, S. K; Anandarao, B. G; Pal, S; Mondal, S; Nandi, A; Bhattacharyya, A; Mandal, S; Sagar, R; Pandey, J. C; Pati, A. K; Saha, S. K (Royal Astronomical Society, 2005-09)
    We conducted a multiwavelength campaign in 2002 September-October, to observe SS 433. We used the Giant Meter Radio Telescope for radio observations, the Physical Research Laboratory Infrared Telescope at Mt Abu for infrared ...
  • 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 ...
  • Waves and oscillations in nature: an introduction 
    Satya Narayanan, A; Saha, S. K (CRC Press, 2015)
    Waves and oscillations are found in large scales (galactic) and microscopic scales (neutrino) in nature. Their dynamics and behavior heavily depend on the type of medium through which they propagate.Waves and Oscillations ...

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