IIA Institutional Repository: Recent submissions

  • Radio emission as a diagnostic for solar coronal rotation 
    Vats, H. O; Deshpande, M. R; Mehta, M; Shah, C. R; Shah, K. J (Astronomical Society of India, 1999)
    The time series of solar radio emission at 2.8 GHz is analysed using correlation methods. The analysis showed that this type of time series can be used to infer the rotation period of the source (in this case solar corona). ...
  • On the solar oscillator strength of SiH^{+} 
    Trivedi, C; Sinha, K (Astronomical Society of India, 1997)
    Rather contrasting values of the oscillator strengths for the (0,0) band of SiH+ molecules for the A 1II - X1 capital sigma+ transition have been reported in the literature. We investigate these with the help of a new set ...
  • Effect of solar radiation pressure on a planet in the photogravitational restricted three-body problem 
    Ahmad, A; Islam, N (Astronomical Society of India, 1997)
    Here, we have deduced the equations of motion of the photogravitional restricted three-body problem considering the effect of solar radiation pressure on a planet and found that it is stabilizing for the triangular libration ...
  • In pursuit of science 
    Varma, R. K (Astronomical Society of India, 1997)
  • My forty years in astronomy 
    Vardya, M. S (Astronomical Society of India, 1997)
  • Evolution of an astrophysicist 
    Narlikar, J. V (Astronomical Society of India, 1997)
  • My encounter with astronomy : later years 
    Bhattacharyya, J. C (Astronomical Society of India, 1997)
  • My encounter with astronomy : early years 
    Bhattacharyya, J. C (Astronomical Society of India, 1997)
  • Planet formation in sun-like systems 
    Bhatt, H. C (Astronomical Society of India, 1999)
    Recent discoveries of substellar and planetary-mass objects in orbit around other stars represent the most remarkable progress achieved in the search for extrasolar planetary systems. The evidence for their existence is ...
  • Near IR lunar occultation observations and results from Gurushikhar observatory 
    Chandrasekhar, T (Astronomical Society of India, 1999)
    Lunar occultation in the near infrared is an elegant and effective technique of achieving high angular resolution in the range of milliarcseconds. Apart from determining with good accuracy the angular diameter and effective ...
  • Optical follow up of the GRB 990123 sources from UPSO, Naini Tal 
    Sagar, R; Pandey, A. K; Mohan, V; Yadav, R. K. S; Nilakshi; Bhattacharya, D; Castro-Tirado, A. J (Astronomical Society of India, 1999)
    The CCD magnitudes in Johnson $BV$ and Cousins $R$ photometric passbands are determined for the optical transient of GRB 990123. These observations have been taken approximately 12 hours after trigger of the gamma-ray ...
  • Recent astronomical site survey at Hanle, Ladakh 
    HIROT Team (Astronomical Society of India, 1996)
    The aspirations of Indian astronomers for a high altitude observatory have led to the exploration of Hanle, southeastern Ladakh as a possible site. After a discussion of the historical background, we present results of the ...
  • Atmospheric extinction measure at Guwahati 
    Barthakur, N. K; Duorah, H. L (Astronomical Society of India, 1996)
    The extinction coefficients in UBV filters were determined using the 15cm reflector at Guwahati University Observatory, Jalukbari during January - March, 1994, January - March, 1995 with photometric observations. The ...
  • Small telescopes and robotics 
    Gupta, R (Astronomical Society of India, 1996)
    Over the past decade, Small Automated Telescopes have been developed at. various observatories. The operation of these telescopes and their related observations are carried out under the control of a computer and thus the ...
  • Some recent advances in astronomical Fabry-Perot spectroscopy 
    Desai, J. N (Astronomical Society of India, 1996)
    The purpose of the present article is to provide a broad perspective of applications of Fabry-Perot Spectroscopy to astronomy, especially focussing attention on some known aspects which are assuming greater importance. ...
  • The Hubble constant 
    Narlikar, J. V (Astronomical Society of India, 1996)
    In this talk the history of Hubble's constant is reviewed from the discovery of the velocity-distance relation to the present day measurements with the Hubble Space Telescope. The problems encountered in fixing the true ...
  • Collapsing void in an expanding universe 
    Mandal, D. R; Banerji, S (Astronomical Soceity of India, 1996)
    We consider here the model of a spherical void in an expanding Robertson - Walker (RW) universe with flat space sections. The void is taken as a sphere of low density conducting perfect fluid (Region I) surrounded by a ...
  • On the nature of compact components of radio sources at 327 MHz 
    Balasubramanian, V; Janardhan, P; Ananthakrishnan, S; Srivatsan, R (Astronomical Society of India, 1996)
    The interplanetary scintillation (IPS) survey of about 5000 radio sources carried out during 1992-93 with the Ooty Radio Telescope (ORT) at 327 MHz has resulted in the detection of compact components in about 2700 sources. ...
  • Multicolour surface photometry of galaxies : Mrk 35 and Mrk 799 
    Chitre, A; Joshi, U. C; Srivastava, J. B (Astronomical Society of India, 1996)
    Imaging photometry of two peculiar galaxies Mrk 35 and Mrk 799 has been carried out using a CCD camera and broad band filters. Both the galaxies are highly disturbed and the morphologies of the galaxies are quite complex. ...
  • On the Hubble diagram of QSOs with cosmological redshifts 
    Sapre, A. K; Mishra, V. D (Astronomical Society of India, 1996)
    In this paper we study the Hubble Diagram of the QSOs whose redshifts are known to be cosmological in nature. These are the QSOs which lie close to bright galaxies and whose redshifts are nearly equal to those of the bright ...

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