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Browsing IIAP Publications by Issue Date

Browsing IIAP Publications by Issue Date

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  • Optical colours and polarization of a model reflection nebula. II. Silicate and graphite grains in a nebula with the star in the rear 
    Shah, G. A (WILEY-VCH Verlag Berlin GmbH & Co, 1977)
    The colour difference between the star and the attendant reflection nebula and polarization both caused by silicate and graphite grains have been given. The properly normalized size distribution function for each type of ...
  • On the e/sup1Σ/sup+ - d/sup1Σ/sup+ transition of TiO related to cool star spectra 
    Murty, P. S (Gordon and Breach Science, 1977)
    Based on the calculated intensity factors for the bands of the e/sup1Σ/sup + - d/sup 1 Σ/sup + transition of the TiO molecule, expected positions of unobserved bands are indicated, for use in studies of cool star spectra. ...
  • Stellar Chromospheres 
    Bappu, M. K. V (1977)
  • The ultraviolet band systems of Bal molecule 
    Rao, M. L. P; Rao, D. V. K; Rao, P. T; Murthy, P. S (1977)
    The emission spectrum of the Bal molecule is excited in a R.F. discharge and photographed in the first order (reciprocal dispersion: 1.25 Å/mm) of a 21 ft. concave grating spectrograph. A comprehensive new vibrational ...
  • The visible emission spectrum of diatomic barium iodide 
    Rao, M. L. P; Rao, D. V. K; Rao, P. T; Murty, P. S (1977)
    High resolution spectrograms of the visible emission spectrum of diatomic barium iodide, excited in a radio-frequency discharge source, reveal the presence of two intense sequences of head-less bands in the region 5330-5620Å. ...
  • The Wolf-Rayet Spectrscopic Binary HD 214419 
    Bappu, M. K. V; Visvanadham, P (Indian Institute of Astrophysics, Bangalore, 1977)
    Velocity curves of the system HD 214419 are obtained for the N IV 4058 and He II 4686 emission lines from prismatic spectra taken in 1951 and 1952. The emission and absorption features experience several phase dependent ...
  • Early Nebular Stage of Nova Cygni, 1975 
    Prabhu, T. P (Indian Institue of Astrophysics, Bangalore, 1977)
    The emission line profiles of the spectrum of the spectrum of the envelope of Nova V 1500 Cyg, 1975 are studied. The spectral region covers LamdaLamda 3700-8800. The velocity structure of the profiles and the time variation ...
  • A Survey of Red Stars in the Direction of the Large Magellanic Cloud: The 30 Doradus Region 
    Bappu, M. K. V; Parthasarathy, M; Scaria, K. K (Indian Institute of Astrophysics, Bangalore, 1977)
    We have commenced a survey of red stars in the direction of the Large Magellanic Cloud using the technique of ultra-low dispersion spectroscopy. This first paper is a listing of the red stars in the 30 Doradus region for ...
  • The Near Infrared Spectra of Wolf Rayet Stars 
    Bappu, M. K. V; Ganesh, K. S; Scaria, K. K (Indian Institute of Astrophysics, Bangalore, 1977)
    The near infrared spectra of three Wolf-Rayet stars of the carbon sequence and five of the nitrogen sequence have been studied. Wavelength identifications and intensity scans are presented to show the emission line ...
  • Ultra-low dispersion spectroscopy of stars and galaxies 
    Bappu, M. K. V; Parthasarathy, M (Indian Institute of Astrophysics, Bangalore, 1977)
    Application of ultra-low dispersion spectroscopy (10.000 Å mm-1) is described to study the nuclei of elliptical galaxies, the quassi - stellar objects and for the discovery of faint OB stars, reddened stars and red stars. ...
  • An Automated Spectrum Scanner 
    Bappu, M. K. V (Indian Institute of Astrophysics, Bangalore, 1977)
    A rapid-scan single channel spectrum in the Ebert-Fastie arrangement has been constructed and successfully used on the Kavalur 102-cm reflector. The special region 3000-11000 Armstrong is covered with appropriate dry-ice ...
  • Fundamental Flux Tubes in the Solar Magnetic Fileds: Significance of the Flux-amount; possibility of rising and durability 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1977)
    For a satisfactory understanding of the solar magnetic phenomena it may be advantageous first to interrelate phenomenologically observations involving different scales of length and time and in different layers of the solar ...
  • Fundamental Flux Tubes in the Solar Magnetic Fields: Generation of the FFT's and the periodic field reversal 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1977)
    It is conceviable that the periodic reversal of the Sun'd large-scale magnetic field and the concentration of the field in strong, thin flux tubes on small scales could bith result from the following likely processes near ...
  • An Analog System for Fast Light Curve Registration 
    Bhattacharyya, J. C; Sundareswaran. A (Indian Institute of Astrophysics, Bangalore, 1977)
    An electronic system for recording fast light curves is described. The system employs a two track magnetic tape recorder for intermediate storage of photometer and time signals and reproduces these on cathode ray oscilloscope ...
  • NU Centauri: A New Beta Cephei Star 
    Rajamohan, R (Indian Institute of Astrophysics, Bangalore, 1977)
    Spectroscopic observations of the single-lined binary, NU Centauri during the years 1968-1972 were utilised to derive fresh orbital elements of this system. The measured radial velocities indicate that the primary component ...
  • K emission line widths in the sun and the stars 
    Bappu, M. K. V; Sivaraman, K. R (Royal Astronomical Society, 1977-02)
    K-emission line widths measured with a micrometer on integrated spectra of the sun have a mean value of 38.2 km/s. A definition is proposed whereby the width is a measure in km/s at the inverse-e value of the difference ...
  • Daytime satellite radio scintillation and sporadic E near the magnetic equator 
    Rastogi, R. G; Deshpande, M. R; Murthy, B. S; Davies, K (American Geophysical Union, 1977-03)
    An investigation is conducted concerning the association between the daytime scintillations of ATS-6 signals received at Ootacamund and the ionograms at the nearby station Kodaikanal, India. The investigation shows that ...
  • Small scale fluctuations in the F-region critical frequency at Kodaikanal 
    Sastri, J. H; Murthy, B. S (Japan Science and Technology Agency, 1977-03)
    Some preliminary results obtained on the small scale fluctuations in the F-region critical frequency at Kodaikanal (Dip 3.5 deg) using 1-min interval ionograms, are presented. Spectral analysis showed the fluctuations to ...
  • 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 ...
  • How black is a black hole? 
    Kapoor, R. C (Bennett. Coleman & Co., Ltd., 1977-05)

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