IIA Institutional Repository: Recent submissions

  • Quantitative test for concave aspheric surfaces using a Babinet compensator 
    Saxena, A. K (Optical Society of America, 1979)
    A quantitative test for the evaluation of surface figures of concave aspheric surfaces using a Babinet compen-sator is reported. A theoretical estimate of the sensitivity is 0.002X for a minimum detectable phase change of ...
  • On AlF lines in sunspots 
    Murty, P. S (D. Reidel Publishing Company, 1977-10)
    Intensity factors for bands of the C-A transition of the AlF molecule are calculated. A reinvestigation for the lines of (0, 0) band of the C-A system in sunspot spectra is suggested, so as to resolve the questionable ...
  • K emission line widths in the sun and the stars 
    Bappu, M. K. V; Sivaraman, K. R (Royal Astronomical Society, 1977-02)
    K-emission line widths measured with a micrometer on integrated spectra of the sun have a mean value of 38.2 km/s. A definition is proposed whereby the width is a measure in km/s at the inverse-e value of the difference ...
  • The angular appearance of white holes 
    Narlikar, J. V; Kapoor, R. C (D. Reidel Publishing Company, 1978-01)
    It is shown that non-radial light rays emitted from the surface of a white hole can emerge from inside the Schwarzschild barrier. The upper limit on their impact parameter is calculated under the requirement that such rays ...
  • Excitation of high-m tearing modes at the solar flare site 
    Krishan, V (D. Reidel Publishing Company, 1982-10)
    It is shown that high-m drift tearing modes can be excited under the conditions prevalent at the solar flare sites. Since the growth rate of the high-m tearing modes is larger than that for low-m macroscopic tearing modes ...
  • Tidal disruption and tidal coalescence in binary stellar systems 
    Alladin, S. M; Parthasarathy, M (Royal Astronomical Society, 1978-09)
    Tidal effects in binary stellar systems are considered. The rate of increase of the binding energy of a component and the rate of decrease of the energy of the orbital motion of the binary are estimated under the simplifying ...
  • Optical microvariability in radio quiet quasars 
    Wiita, P. J; Gopal-Krishna; Sagar, R (Kluwer Academic Publishers, 1994)
    We have observed 11 radio quiet QSOs (RQQSOs) to see if they exhibit intranight variability in the optical. The detection of such microvariability would support models in which flutuations on accretion disks are dominant, ...
  • On the infrared bands of a A10 related to Mira phenomena 
    Murty, P. S (D. Reidel Publishing Company, 1978-04)
    The calculated band positions and intensity factors for the bands of the infrared A-X transition of A10 suggest that an investigation for the infrared bands in the 1 to 5 micron region of the spectra of Mira stars and M ...
  • On magnesium monoxide lines in sunspot spectra 
    Murty, P. S (D. Reidel Publishing Company, 1979-08)
    For use in the investigations of magnesium monoxide lines in sunspot spectra, values of Franck-Condon intensity factors for the red bands and the wavelength regions for the intense bands of the red and near-ultraviolet ...
  • A low-frequency (30-110 MHz) Antenna system for observations of polarized radio emission from the solar corona 
    Ramesh, R; Kathiravan, C; Sundararajan, M. S; Barve, Indrajit V; Sastry, Ch. V (Springer Netherlands, 2008-12)
    An interferometer antenna system to observe polarized radio emission from the solar corona at different frequencies in the range 30-110 MHz has been commissioned recently by the Indian Institute of Astrophysics at the ...
  • Optical colours and polarization of a model reflection nebula. II. Silicate and graphite grains in a nebula with the star in the rear 
    Shah, G. A (WILEY-VCH Verlag Berlin GmbH & Co, 1977)
    The colour difference between the star and the attendant reflection nebula and polarization both caused by silicate and graphite grains have been given. The properly normalized size distribution function for each type of ...
  • The predicted infrared spectrum of ZrO and its possible presence in S stars 
    Murty, P. S (D. Reidel Publishing Company, 1980-04)
    The unidentified absorption feature at 9730 ± 5 A observed in the spectra of pure S stars is provisionally identified with the predicted 9732 A (0, 0) band of the e `IT-c `z\ transition of ZrO molecule. Relative band ...
  • Spectrophotometric studies of Am stars 
    Babu, G. S. D; Shylaja, B. S (D. Reidel Publishing Company, 1982-04)
    The relationships among the various physical parameters, namely the effective temperatures, radii and bolometric magnitudes, determined on the basis of the energy distribution curves of 25 Am stars are investigated. The ...
  • Spectrophotometric studies of Ap stars 
    Babu, G. S. D; Shylaja, B. S (D. Reidel Publishing Company, 1982-01)
    Based on the observed energy distribution curves of about a hundred Ap stars, the various relationships among their physical parameters: namely, the temperatue, colour index, bolometric correction and bolometric magnitude ...
  • On the E 1 Pi-X 1 Sigma + and 1 Sigma +-X 1 Sigma + transitions of ZrO related to S star spectra 
    Murty, P. S (American Astronomical Society, 1980-08)
    In view of the prevalent interest in the singlet band systems of ZrO, which are present in the spectra of pure S stars, values of band intensity factors (FCFs) and r-centroids are evaluated and displayed for the e1 Pi - ...
  • Visible spectrum of Pi/sup1 Gruis - Identification of new E/sup1 Pi-X/sup1 Sigma/sup+/ and 1 Sigma/sup+ - X/sup1 Sigma/sup+ bands of ZrO 
    Murty, P. S (American Astronomical Society, 1982-09)
    New molecular features identified with the e 1H-X + and ` +-X ` + transitions of ZrO, in the 5840-7210 A spectral region of the S star ` Gru, are presented. The measured band positions are in accord with the laboratory and ...
  • On the stability of helical velocity and magnetic fields 
    Kochhar, R. K (D. Reidel Publishing Company, 1978-05)
    In this paper we study the stability of an infinitely conducting, incompressible, inviscid infinite cylinder with non-parallel helical velocity and magnetic field. It is shown that the system is stable if the energy in the ...
  • Torsion quantum effects and the problem of cosmological constant 
    de Sabbata, V; Sivaram, C (Plenum Press, 1991)
  • Effect of dynamical friction on the escape of a supermassive black hole from a galaxy 
    Kapoor, R. C (D. Reidel Publishing Company, 1985-05)
    We have used the impulsive approximation technique to numerically estimate the effect of dynamical friction on the motion of a supermassive black hole (mass 109 M ) through a galaxy (mass=1011 M ) which has recoiled from ...
  • Dynamical friction and the escape of a compact supermassive object shot from the center of a galaxy 
    Kapoor, R. C (D. Reidel Publishing Company, 1985-12)
    A numerical study has been made of the motion of a compact object consisting of a supermassive black hole with a dense cluster of stars around through a galaxy which has recoiled from the center of the latter as a result ...

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