IIAP Publications: Recent submissions

  • Upper mass limit for neutron star stability against black hole formation 
    Krishan, V; Kumar, N (D.Reidel Publishing Co.,, 1978-08)
    Starting from the exact general relativistic expression for the total energy of selfgravitating spherically distributed matter and using the minimum energy principle, we calculate the upper mass limit for a neutron star ...
  • New monochromators of concave grating suitable for space telescopes 
    Singh, M (Optical Society of America, 1978)
    Three types of new mono chromators based on the new mounting of concave grating by Singh Majumdar (SM) are described. These mono chromators are very compact and simple in operation, fulfilling the requirements of a mono ...
  • Conductivity of an ion-acoustically turbulent plasma 
    Krishan, V (D.Reidel Publishing Co.,, 1978-09)
    Three different mechanisms are suggested for the non-linear saturation of the ion-acoustic instability. These include the indirect wave-particle interaction, the scattering on density fluctuations and the effects of energy ...
  • Unusual extinction profiles by Rayleigh scattering 
    Shah, G. A (WILEY-VCH Verlag Berlin GmbH & Co, 1977)
    The extinction efficiencies for small smooth metallic particles (granules) have been calculated using rigorous Mie theory of scattering. Strong size-dependent resonances for spheres composed of sodium, potassium, and calcium ...
  • Observations of weak G-band stars 
    Kameswara Rao, N (Royal Astronomical Society, 1978-11)
    Scanner observations of the strengths of the G-band stars of CH at λ4300 and of the NH bands at λ3360 were obtained fro 10 weak G-band stars (wG stars) along with 2 normal field giants of spectral types G to K. the ...
  • Density dependence of solar emission lines of oxygen-like ions 
    Raju, P. K; Dwivedi, B. N (D.Reideal Publishing Co.,, 1978-12)
    Assuming steady state conditions, the occupation of 9 levels of oxygen-like ions: Ne iii, Mg v, Si vii, S ix, and Ar xi have been computed as a function of electron density and temperature. The following physical processes ...
  • A central gravitational redshift model for the absorption redshift systems in quasi-stellar objects 
    Das, P. K (Royal Astronomical Society, 1979-01)
    Static, spherically symmetric configurations of core and envelope type have been considered in General Relativity as central gravitational redshift models for the quasi-stellar objects (QSOs) and an attempt has been made ...
  • Equivalent width of OI λ7774 and absolute magnitude relation for F and G supergiants 
    Kameswara Rao, N; Mallik, S. G. V (Royal Astronomical Society, 1978-04)
    Luminosity calibration is established for F5-G2 supergiants using the equivalent width measures of OI λ7774 and FeI λ7748
  • 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 ...

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