IIA Institutional Repository: Recent submissions

  • 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)
  • The spectral behaviour of A-type metallic line spectroscopic binary 41 Sex A 
    Sreedhar Rao, S; Abhyankar, K. D; Nagar, P (Astronomical Society of India, 1990)
  • Spectroscopic Orbits of HR:3009 and HR:3335 
    Raghavender Rao, C; Abhyankar, K. D (Astronomical Society of India, 1990)
    New spectroscopic orbital elements of two short period doublelined spectroscopic eclipsing binaries HR 3009 and HR 3335 are presented
  • Some preliminary statistical results from the eighth catalogue of the orbital elements of spectroscopic binary systems 
    Batten, A. H; Fletcher, J. M (Astronomical Society of India, 1990)
    The Eighth Catalogue of the Orbital Elements of Spectroscopic Binary Systems has recently been published. It contains elements for 1,469 systems of which 814 are of category c (reliable) or better. The stability of the ...
  • On the chemical abundances of close binary stars on and near the main sequence 
    Koch, R. H (Astronomical Society of India, 1990)
    A review is made of the chemical abundances of binary stars in the catalogs of Cayrel de Strobel (1981, 1985). Solar-type single-line close binaries, A- and B-type close binaries on and near the main sequence, and close ...
  • Close binaries - Abundances and mass loss 
    Parthasarathy, M (Astronomical Society of India, 1990)
    The abundances and mass loss aspects of close binary systems are discussed. Emphasis is given to Algol systems, including V453 Sco, V 356 Sgr, RY Scuti, and W Serpentis. Hydrogen-poor close binary systems, symbiotic stars, ...
  • Distortion wave characteristics and starspot modelling in the RS CVn eclipsing binary SV Camelopardalis 
    Sarma, C. V. S. R; Vivekananda, P; Sarma, M. B. K (Astronomical Society of India, 1990)
    Four migrating groups of wave minima are identified in the light curves of SV Cam of which two show direct motion with period 3.02 and 1.6 yr while the other two display retrograde motion with periods 3.04 and 0.6 yr. Based ...
  • SPOT Modelling in the Rs-Canum System Wy-Cancri 
    Vivekananda Rao, P; Sarma, M. B. K (Astronomical Society of India, 1990)
  • Eclipsing binary research at Uttar Pradesh State Observatory 
    Srivastava, J. B; Chaubey, U. S; Pande, M. C (Astronomical Society of India, 1990)
    The results of photometric and spectroscopic studies of binary stars at Uttar Pradesh State Observatory are summarized. The star names, their magnitudes and periods, and their orbital elements are given. Findings on the ...
  • Radio emission from binary systems 
    Venugopal, V. R (Astronomical Society of India, 1990)
    The radio emission from a few binary systems is discussed. RS CVn stars, the Algol-type systems CC Cassiopeae, AR Lacertae, Beta Persei, and the X-ray emitting radio stars Cygnus X-3 and Sco X-1 are considered. A brief ...
  • Gamma ray observations of polars 
    Bhat, C. L (Astronomical Society of India, 1990)
    Experimental evidence is reported for the discovery of an entirely new class of gamma-ray binary objects involving a magnetic white dwarf rather than a neutron star degenerate primary. These sources may have photon energies ...
  • X-ray orbital modulations in low-mass X-ray binaries 
    Pandey, U. S (Astronomical Society of India, 1990)
    It is suggested that structure in the outer parts of the accretion disk of low-mass X-ray binaries may be due to tidal action of the secondary which is overflowing its Roche lobe. These structures at various phases may ...
  • Pulsars and binary stars 
    Shukre, C. S (Astronomical Society of India, 1990)
    After brief introductions to the evolution of close binary systems, pulsars, and X-ray binaries, the evolution of the study of these systems is examined and the present state of understanding is addressed. The impact of ...
  • Accretion dynamics in binary systems 
    Prasanna, A. R (Astronomical Society of India, 1990)
    Accretion in binary systems with self-consistent electromagnetic fields in the presence of an intense gravitational fields is discussed. The role that such accretion plays in the occurrence of quasi-periodic oscillations ...

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