IIA Institutional Repository: Recent submissions

  • On the orbital periods of the eclipsing binaries CM Lacertae, AB Andromedae and YY Eridani 
    Panchatsaram, T; Abhyankar, K. D (Astronomical Society of India, 1981-09)
    A study of all the available photoelectric times of minima of CM Lac, AB And and YY Eri does not reveal any changes in their orbital periods.
  • On the frequency shift in radiation from a source orbiting a balckhole 
    Kapoor, R. C (Astronomical Society of India, 1981-09)
    An analytical study has been carried out of the non-tangential emission of photons in the orbital plane from a monochromatic source of radiation orbiting a blackhole, using the method of geometrical optics. The formulation ...
  • Ionized molecules in facula models 
    Tripathi, B. M; Gaur, V. P; Pande, M. C (Astronomical Society of India, 1981-09)
    Equivalent widths for the lines of ionized molecules AlH+, CH+, CN+ CO+, N2+, NH+, OH+ and SiH+ have been calculated in five facular and two photospheric models. The calculations suggest that CH+ should show up in facular ...
  • Wave propagation in solar magnetic tubes 
    Venkatakrishnan, P (Astronomical Society of India, 1981-09)
    The work done on propagation of waves in magnetic tubes is reviewed. It is seen that majority of the results obtained so far are based on the thin tube approximation. It is shown that estimates of the mechanical energy ...
  • Role of scattering in emergent planetary radiation 
    Bhatia, R. K; Abhyankar, K. D (Astronomical Society of India, 1981-09)
    Starting from the basic concepts, the role played by multiple scattering in modifying the intensity and polarization of radiation incident on a planetary atmosphere is brought out. Formation of spectral lines in such an ...
  • Notes for the Observer 
    Prabhu, T. P (Astronomical Society of India, 1981-06)
  • Is HR 2947 a variable? 
    Kameswara Rao, N; Ashok, N. M; Kulkarni, P. V (Astronomical Society of India, 1981-06)
    Observations of HR 2947 show that it is fainter by 0.3 mag in V compared to the magnitude listed by Cowley et al. (1969). The energy distribution from 1565 Armstrong to 1.25 micro is similar to that of a B5 III star and ...
  • A study of the period of U Ophiuchi 
    Panchatsaram, T (Astronomical Society of India, 1981-06)
    With the available photoelectric times of minima the variations in the orbital period of U Oph can be interpreted in terms of the presence of a third body.
  • Ultraviolet astronomy with the International Ultraviolet Explorer 
    Gondhalekar, P. M (Astronomical Society of India, 1981-06)
    Astronomical research with the International Ultraviolet Explorer has been reviewed.
  • Evolution and period changes in binary stars 
    Abhyankar, K. D (Astronomical Society of India, 1981-06)
  • Notes for the Observer 
    Prabhu, T. P (Astronomical Society of India, 1981-03)
  • Spectra of two recent supernovae 
    Prabhu, T. P (Astronomical Society of India, 1981-03)
    Preliminary results on the spectroscopy of two recent supernovae are presented. The spectrograms obtained at a dispersion of 400 Armstrong m/m in the wavelength range of 4300-8700 Armstrong show that the supernova in NGC ...
  • Asymmetry in energy transfer in a collision of galaxies 
    Ahmed, Farooq; Alladin, S. M (Astronomical Society of India, 1981-03)
    The time dependence of binding and translational energies of a pair of galaxies during head-on collisions has been studied with impulsive approximation. The two galaxies are assumed to be identical with mass distribution ...
  • SW Lacertae - A quadruple system 
    Panchatsaram, T; Abhyankar, K. D (Astronomical Society of India, 1981-03)
    Orbital period study using photoelectric times of minima of SW Lac revelas that the period change is caused by the orbital motion of a triple system around a fourth body. The orbital periods of the third and the fourth ...
  • Notes for the Observer 
    Prabhu, T. P (Astronomical Society of India, 1981-09)
  • Accurate positions of Markarian galaxies 
    Joshi, Mohan. N; Kandalian, Rafik. A (Astronomical Society of India, 1981-03)
    Optical positions of 304 Markarian galaxies, MRK 1096 to 1339, are given with accuracies better than 1 arcsec.
  • The local supercluster of galaxies 
    de Vaucouleurs, G (Astronomical Society of India, 1981-03)
    The history of the discovery of the Local Supercluster or "Supergalaxy" is traced. Recent studies of its influence on the distribution and velocities of nearby galaxies are reviewed.
  • Meteorological Experiments During the Total Solar Eclipse of February 16, 1980 
    Verma, V. P; Chandrasekharan, C. K; Chatterjee, K; Kulshreshtha, S. M; Das, S. K (Astronomical Society of India, 1980-12)
    The India Meteorological Department (IMD) conducted special observations during the total solar eclipse on February 16, 1980. These observations were mainly designed to study the effects of the total solar eclipse on the ...
  • Ionospheric Effects During February 1980 Solar Eclipse 
    Chandra, H; Deshpande, M. R; Vyas, G. D; Sethia, G; Vats, H. O; Iyer, K. N (Astronomical Society of India, 1980-12)
    Highlights of the ionospheric effects of the total solar eclipse of February 16, 1980 detected by ground-based experiments in India are summarised. Decrease in electron density at various height in ionosphere upto the F2 ...
  • Phase and field Measurements at VLF, LF and HF During the Solar Eclipse of February 16, 1980 -- Preliminary Results 
    Dixit, P. S; Rao, P. K; Bhonsle, R. V; Sethia, G; Deshpande, M. R; Chandra, H (Astronomical Society of India, 1980-12)
    Phase and field measurements at 16kHz (VLF) by monitoring GBR (Rugby, England) and at 10 MHz (HF) ATA (New Delhi) were carried out from Satellite Tracking and Ranging Station (Kavalur) during the solar eclipse of February ...

Search DSpace

Browse

My Account