Publications of Astronomical Society of India: Recent submissions

  • 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 ...
  • Dynamical evolution of binary systems 
    Mohammed Alladin, S (Astronomical Society of India, 1990)
    The interaction of binary stars with single stars and the role of binary stars in star clusters are discussed. Some aspects of galaxy interactions are mentioned which can be viewed as analogs of binary-single body encounters ...
  • Periodic activity in the T Tauri star TW Hya 
    Mekkaden, M. V (Astronomical Society of India, 1990)
    UBVRI photometry of the isolated T Tauri star TW Hya, obtained during 1987 April from ESO, is presented. The data analysis shows a periodicity of 2.195 d in light variation. The steep increase of amplitude towards shorter ...
  • The evolutionary considerations of R CR B stars - Observational approach 
    Kameswara Rao, N (Astronomical Society of India, 1990)
    The properties of the hydrogen-deficient stars called extreme helium stars, R Cr B stars, and hydrogen-deficient carbon stars are briefly examined, emphasizing the R Cr B stars. Luminosities and temperatures, distribution ...
  • Effects of rotation on the colours and line indices of stars. IV - The effect on broad band UBV colours 
    Mathew, M; Rajamohan, R (Astronomical Society of India, 1990)
    The effect of rotation on UBV photometry is estimated. The relationship between (U-B) and (u-b) and also (B-V) and (b-y) are established using the standard stars photometry to compare the observed effects with theoretical ...
  • Effects of rotation and tidal distortions on the equilibrium structure and periods of oscillations of stars in binary systems 
    Mohan, C; Saxena, R. M (Astronomical Society of India, 1990)
    Methods for computing the equilibrium structures and periods of barotropic modes of oscillations of stars which are the primary components of binary systems are presented. The methods utilize the averaging technique of ...
  • Rotation and mass loss in early type stars 
    Vardya, M. S (Astronomical Society of India, 1990)
    The effects of rotation on the mass loss rate in O and B stars are reviewed. Conflicting findings concerning those effects by various researchers are examined and explained
  • Spectrophotometric Observations of GAMMA-2-VELORUM 
    Shylaja, B. S (Astronomical Society of India, 1990)

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