IIA Institutional Repository: Recent submissions

  • The growth of publications of the Astronomical Society of India 
    Gupta, S. K; Sinha, K (Astronomical Society of India, 1991)
  • Expedition to Mauritius for observing supernova 1987A 
    Babu, G. S. D; Bhatnagar, A. K; Narayanan, R. S (Astronomical Society of India, 1991)
    A two-member expedition to the island country of Mauritius was organized in February/March 1988 to observe the supernova 1987A photometrically. The only occasion when one complete set of observations of SN 1987A could be ...
  • The Kodaikanal solar vector magnetograph - Laboratory evaluation of the polarimeter 
    Venkatakrishnan, P; Narayanan, R. S (Astronomical Society of India, 1991)
    Laboratory experiments performance to evaluate the sensitivity of the polarimeter of the Kodaikanal vector magnetograph. The polarimeter does not produce significant cross talk and has a sensitivity of about 1 percent polarization
  • Photometric performance of UPSO CCD system 
    Mohan, V; Paliwal, D. C; Mahra, H. S (Astronomical Society of India, 1991)
    The photometrics CCD system obtained by the Uttar Pradesh State Observatory is discussed. The calibration of the system is described and its photometric performance is evaluated based on photometric transformation coefficients
  • GONG site evaluation program at Udaipur Solar Observatory 
    Ambastha, A; Bhatnagar, A; Jain, R; Srivastava, N; Gupta, S; Sharma, R; Agrawal, G (Astronomical Society of India, 1991)
    The Global Oscillations Network Group (GONG) project to study the internal structure and dynamic of the sun is discussed. The GONG project will measure waves that penetrate throughout the sun's core. Power spectra of the ...
  • An improved spectroscopic orbit for HD 75767 
    Griffin, R. F (Astronomical Society of India, 1991)
    HD 75767 is a sixth-magnitude solar-type star for which Sanford gave an orbit in 1931 on the basis of 37 low-dispersion Mount Wilson spectrograms. The orbit has a period of 10 days and was attributed a small eccentricity. ...
  • The Ooty Summer Training Program 1990 
    Saikia, D. J; Salter, C. J; Banhatti, D. G; Ghosh, T; Gothoskar, P; Manoharan, P. K (Astronomical Society of India, 1991)
  • On the mass-radius relation for neutron stars 
    Abhyankar, K. D (Astronomical Society of India, 1991)
    The classical equation of state for a nonrelativistically degenerate gas containing free fermions gives an upper limit to the radius of a neutron star while the Schwarzschild radius gives the lower limit. The lower mass ...
  • Spectroscopic Reductions Using Respect Software 
    Prabhu, T. P; Anupama, G. C (Astronomical Society of India, 1991)
    The RESPECT software has been developed locally at the Vainu Bappu Observatory, Kavalur for spectroscopic data reduction, and is being upgraded continuously. The software is described here in the general perspective of ...
  • Sky conditions for infrared observations at Kavalur 
    Scaria, K. K; Nair, R. M; Sivaraman, K. R (Astronomical Society of India, 1991)
    The extinction coefficients in the J, H, K near-IR bands are presented that were derived for Kavalur during the years 1987, 1988, and 1989. Humidity and temperature observations made at Kavalur during these years are used ...
  • Temperature and brightness distributions in the components of close binary system 
    Barman, S. K (Astronomical Society of India, 1991)
    A theoretical model of close binary system for the gravity-darkening due to tidally and nonuniformly rotating Roche components has been formulated using the fourth order of r/R where r is the radial distance and R is the ...
  • Spectrophotometric observations of B type stars HR 1207 and HR 1770 
    Joshi, S. C; Ojha, D. K (Astronomical Society of India, 1991)
    Two high rotational velocity B type stars HR 1207 and HR 1770 have been observed spectrophotometrically. The energy distribution curves of the stars have been compared with model atmospheres in the ultraviolet and visible ...
  • Photometry of Comet P/Halley on 1986 March 19 
    Sen, A. K; Deshpande, M. R; Joshi, U. C (Astronomical Society of India, 1991)
    Photometric observations of the Comet P/Halley are described with specific data given regarding the fluxes in the coma and the dust tail and their molecular contents. The observed magnitude of the solar-type star HD 105590 ...
  • Polarization in binaries 
    Barman, S. K; Peraiah, A (Astronomical Society of India, 1991)
    Theoretical models are computed for estimating linear polarization from the extended dusty outer layers of the components of a close binary system whose surfaces are distorted by rotation and mutual tidal effects. ...
  • Evolution of Sunspots Seen in Molecular Lines - Part Two 
    Sinha, K; Tripathi, B. M (Astronomical Society of India, 1991)
  • Evolution of sunspots seen in molecular lines. I 
    Sinha, K; Tripathi, B. M (Astronomical Society of India, 1991)
    Equivalent-width calculations are conducted for lines of C2, MgH, and TiO relevant to photospheric and sunspot model atmospheres to determine the effects of magnetic field strength on line intensities. Sunspot models with ...
  • Effects of Aberration and Advection on Line Transfer in Plane Parallel Geometry 
    Peraiah, A; Varghese, B. A (Astronomical Society of India, 1991)
  • Forbush decreases in cosmic rays 
    Venkatesan, D; Ananth, A. G (Astronomical Society of India, 1991)
    The cosmic-ray time variation called Forbush decreases are examined in an overview of observational data with attention given to the three species of Forbush decreases. References are made to the satellite observations of ...
  • Merger and disruption lifetimes of binary star clusters in the Large Magellanic Cloud 
    Bhatia, R. K (Astronomical Society of India, 1990)
    The times of merger due to mutual gravitational interaction and disruption by the tidal field of the LMC and by passing giant molecular clouds of binary star clusters in the Large Magellanic Cloud are calculated as a ...
  • Formation of a binary in the general three-body problem 
    Bhatnagar, K. B (Astronomical Society of India, 1990)
    This paper reviews the role of triple encounters in the evolution of stellar systems. If a symmetric triple collision is perturbed, a family of asymmetric triple close approaches with arbitrary escape velocities and with ...

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