IIA Institutional Repository

Browsing by Subject "Binary Stars"

Browsing by Subject "Binary Stars"

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  • Reflection effect in close binaries. II - Distribution of emergent radiation from the irradiated component along the line of sight 
    Peraiah, A (Indian Academy of Sciences, 1983-03)
    The author has calculated the effects of irradiation from a point source observed at infinity. Plane-parallel approximation and spherically-symmetric approximations are employed in calculating the self-radiation field for ...
  • Reflection effect in close binaries. III - Distribution of radiation incident from an extended source 
    Peraiah, A (Indian Academy of Sciences, 1983-06)
    The effects of irradiation from an extended surface of the secondary component on the atmosphere of the primary are studied. Consideration is given to an isothermal and purely scattering medium. The resultant radiation ...
  • Report on the IAU Symposium No. 88 on Close Binary Stars: Observation and Interpretation 
    Budding, E (Astronomical Society of India, 1979-09)
  • RS CVn-type variables. I - Photometry of HR 1099 
    Parthasarathy, M; Raveendran, A. V; Mekkaden, M. V (D. Reidel Publishing Co., 1981-01)
    Photometric observation of HR 1099 inV andB obtained on 18 nights between January and March 1977 is presented. The amplitude of the asymmetric light curve is found to be 0m.10±0m.004 both inV andB. On three occasions—namely, ...
  • Runaway stars as witnesses to supernova explosions 
    Kochhar, R. K (Nature Publishing Group, 1978-02)
    A hypothesis is proposed according to which single runaway stars are released from close binaries in which the companion star explodes as a carbon detonation supernova and is totally disrupted. From the stars which can ...
  • Spectroscopic observations of delta orionis 
    Singh, M (Kluwer Academic Publishers, 1982-10)
    The H α profile in the spectrum of δ Orionis shows phase-dependent changes, with a period of variation equal to the orbital period fo the binary system. The profile shape changes from a normal absorption profile at zero ...
  • Spectroscopic observations of Nu Centauri 
    Ashoka, B. N; Surendiranath, R; Kameswara Rao, N (Copernicus Foundation for Polish Astronomy, 1985)
    Presented are radial-velocity observations of the single-line spectroscopic binary and Beta Cephei-type variable Nu Cen, obtained in the period 1983-1984. New orbital elements have been determined by combining these ...
  • Spot activity in the RS CVn binary HR 1099 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Indian Academy of Sciences, 1982-03)
    UBV photometry of HR 1099 obtained during the 1979-80 and 1980-81 observing seasons is presented. An analysis of the available data shows that the brightness at the light curve maximum increases as the wave amplitude ...
  • Stellar rotation on the zero age main sequence 
    Rajamohan, R (Royal Astronomical Society, 1978-09)
    Analysis of rotational velocities of unevolved members in clusters indicates that for a given mass the dispersion in the true rotational velocities is small for normal, single main-sequence stars. The envelope of highest ...
  • Study of the Wolf-Rayet members of the cluster NGC 6231 
    Shylaja, B. S (Indian Academy Sciences, 1988-09)
    Two Wolf-Rayet members of the cluster NGC 6231 are studied spectrophotometrically. HD 151932, a suspected variable, shows variations in the emission line flux as well as continuum magnitude measurements. An attempt is made ...
  • 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 ...
  • The variability of HD 76536 
    Shylaja, B. S (Kluwer Academic Publishers, 1990-02)
    The spectrophotometric and photometric observations of the WC star HD 76536 are reported. The flux and the magnitude variations appear to be periodic. The possibilities of a compact binary are discussed.

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