IIA Institutional Repository

Browsing IIAP Publications by Subject "Binary Stars"

Browsing IIAP Publications by Subject "Binary Stars"

Sort by: Order: Results:

  • Auto-correlation of Binary stars 
    Saha, S. K; Maitra, D (Indian Association for the Cultivation of Science, 2001)
    Speckle interferometric technique is used to record a series of short exposure images of several close binary stars with sub-arcsecond separation through a narrow band filter centred at H$\alpha$ at the Cassegrain focus ...
  • A classification scheme for pulsars 
    Kochhar, R. K (Nature Publishing Group, 1977-11)
    The implications of a pulsar classification scheme are discussed. Three types of pulsars are distinguished - Type S (S for single) from supernova explosions of single stars; type D (D for disrupted) from binaries disrupted ...
  • The dependence of He I 10830 absorption on X-ray luminosity in RS CVn binaries and very active F and G main-sequence stars 
    Mekkaden, M. V (Kluwer Academic Publishers, 1985-03)
    A study of the relationship between soft X-ray luminosity and He I 10830 equivalent width in RS CVn binaries and very active late-type main-sequence stars is made. Long-period RS CVns and very active F and G main-sequence ...
  • The determination of a spectroscopic binary orbit 
    Singh, M (Kluwer Academic Publishers, 1984-03)
    An efficient analytical method for determining the orbit of a spectroscopic binary is presented. The advantages of the method are: (1) its accuracy, (2) its rapidity, and (3) the possibility of making adjustments in the ...
  • Effects of rotation on colours and line indices of stars. III - Binary and peculiar stars 
    Rajamohan, R; Mathew, A (Kluwer Academic Publishers, 1990-02)
    The broad-band UBV colors and the intermediate band uvby colors of Alpha Persei, Pleiades, and the Scorpio-Centaurus association are analyzed for rotation effects. An attempt was made to discriminate normal single stars ...
  • Effects of rotation on the colours and line indices of stars. I - The Alpha Persei Cluster 
    Rajamohan, R; Mathew, A (Indian Academy Sciences, 1988-06)
    Analysis of the available observational data for the Alpha-Persei cluster members shows that rotation effects on the intermediate-band indices c1 and (u-b) are considerable. In c1, rotation produces a reddening of 0.040 ...
  • Evolution of starspot regions in DM UMa 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V; Hall, D. S; Henry, G. W (Kluwer Academic Publishers, 1985-10)
    B andV photometry of DM UMa obtained between January, 1980 and June, 1984 is presented. Analysis yields a mean photometric period 7d.478±0d.010, compared to the known oribital period of 7d.492±0d.009. Light curves obtained ...
  • The H-alpha line profile in early type-binary systems HD 47129 and Gamma Velorum 
    Rajamohan, R (Kluwer Academic Publishers, 1984-02)
    A brief description of the variation of the Hα line profile in γ Velorum and HD 47129 is given.
  • HD 81410 - A new RS CVn binary 
    Raveendran, A. V; Mekkaden, M. V; Mohin, S (Royal Astronomical Society, 1982-05)
    B and V photometry of HD 81410 obtained on 34 nights between January 3 and March 14 of 1981 is presented. In both B and V, the amplitudes are found to be approximately 0.15 mag. It is also found that a 12.86833 day period ...
  • A model for the millisecond pulsar PSR 1937 + 214 
    Kochhar, R. K; Sivaram, C (Springer, 1984-01)
    The authors suggest a model for the millisecond pulsar PSR 1937+214, according to which the immediate progenitor of the pulsar was a binary consisting of two neutron stars of unequal mass. The heavier neutron star was spun ...
  • Observation of an H-alpha outburst in the Be star HR 4123 
    Ghosh, K. K; Apparao, K. M. V; Tarafdar, S. P (American Astronomical Society, 1989-09)
    During routine monitoring of the Be star HR 4123 during the year 1987-1988, a burst of H-alpha emission was observed on May 11, 1987. The increase was observed on May 9 and lasted until June 7, peaking to an equivalent ...
  • Observations of X-Per in optical domain 
    Sharma, D. P; Nagaraja, B. V; Bhattacharyya, J. C; Mohin, S; Raveendran, A. V (Kluwer Academic Publishers, 1983-09)
    We have monitored the X-ray source X-Per (4U 0352+30) on 31 August, 1979 through aU filter for about 1.5 hr using 102-cm telescope of Kavalur observatory. During this period intensity of X-Per fluctuated for some time, on ...
  • On the intrinsic rotation of magnetic variables 
    Rajamohan, R; Babu, G. S. D (Royal Astronomical Society, 1978-03)
    It is observed that the rotational velocities of most Ap stars are dependent on their masses. Deviations from this general rule may be explained in terms of multiplicity which affects the derived colors and radii. Spectroscopic ...
  • On the orientation of the pulsar space velocity vector relative to the spin axis 
    Kochhar, R. K (Nature Publishing Group, 1977-05)
    It is noted that the angle between the space velocity vector and the spin axis projected on the plane of the sky has a value close to zero deg for three pulsars, close to 90 deg for six others, and between zero and 90 deg ...
  • Orbit of the spectroscopic binary B Persei 
    Rajamohan, R; Parthasarathy, M (Indian Academy of Sciences, 1975-04)
    Spectroscopic orbital elements are derived for the close binary system b Persei on the basis of forty spectrograms. The period is redetermined as 1.527360 days, and variations in the orbital elements are confirmed by ...
  • Re-analysis of close binary systems 
    Indulekha, K; Kundt, W; Shylaja, B. S (Kluwer Academic Publishers, 1990-10)
    The facts indicating that large line-forming regions occur among the best-studied close binaries are outlined. It is pointed out that emission lines are often redshifted while absorption lines are blueshifted, emission ...
  • 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 ...
  • 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 ...

Search DSpace


Browse

My Account