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Browsing IIAP Publications by Issue Date

Browsing IIAP Publications by Issue Date

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  • Radial velocities of seven Sersic galaxies 
    Prabhu, T. P (Indian Institute of Astrophysics, 1978)
    The radial velocities of 7 Sersic galaxies are reported. Three out of these (NGC 2903, 2997 and 5236) have published radial velocities prior to this work while the radial velocities of four remaining galaxies (NGC 922, ...
  • Red and blue stars in the direction of the Large Magellanic Cloud 
    Parthasarathy, M (International Astronomical Union, 1978)
    The Large Magellanic Cloud has been surveyed on ultralow dispersion (10,000 A/mm) plates taken with the 102-centimeter reflector at Kavalur. Many new red and blue stars were found. The LMC bar was found to have a strong ...
  • Onset of equatorial spread-f 
    Sastri, J. H; Murthy, B. S (European Geophysical Society, 1978)
  • New monochromators of concave grating suitable for space telescopes 
    Singh, M (Optical Society of America, 1978)
    Three types of new mono chromators based on the new mounting of concave grating by Singh Majumdar (SM) are described. These mono chromators are very compact and simple in operation, fulfilling the requirements of a mono ...
  • A survey of red stars in the direction of the Large Magellanic Cloud. 2. Some regions around the bar. 
    Bappu, M. K. V; Parthasarathy, M; Scaria, K. K (Indian Institute of Astrophysics, 1978)
    We have continued the survey for red stars in the direction of the large Magellanic Cloud using the technique of ultra-low dispersion spectroscopy. This paper which is the second one on the series lists 706 stars located ...
  • On some photographic AIDS for the measurement of Astronomical spectra 
    Bappu, M. K. V (European Southern Observatory, 1978)
  • Planetary nebulae and nitrogen enrichment in the galaxy 
    Mallik, D. C. V (Geneva Observatory, 1978)
    The extent of nitrogen enrichment of the interstellar gas by planetary-nebula formation is evaluated, and the nitrogen and oxygen abundance gradients in the disk of the Galaxy are derived on the basis of a simple model for ...
  • Violet absorption edges of C IV lines in Wolf-Rayet spectra: possible superposition with diffuse interstellar bands at 5780 Å and 5797 Å 
    Giridhar, S; Bappu, M. K. V (Indian Institute of Astrophysics, 1978)
    It is shown that the violet edges normally seen in Wolf-Rayet stars around 5800Å are principally due to displaced C IV absorption. The diffuse interstellar bands are seldom of comparable strength and can be seen separately ...
  • On negative intensities in discrete space theory in spherical medium 
    Peraiah, A (Indian Institute of Astrophysics, 1978)
    The reasons for the occurrence of negative intensities are discussed. A method is described to obtain positive solution of radiative transfer equation in spherical symmetry in distance space theory by using frequency ...
  • The astronomical seeing at Kavalur. 
    Bappu, M. K. V; Mohin, S; Unnikrishnan, K. G (Indian Institute of Astrophysics, 1978)
    A summary of observing conditions at Kavalur Observatory is p0resented. These related to spectroscopic and photometric observations and to seeing as evaluated at the 102cm telescope. Nearly fifty percent of nights on which ...
  • The He II 5411 Å velocity curve of the Wolf-Rayet eclipsing system HD 214419 
    Giridhar, S (Indian Institute of Astrophysics, 1978)
    A velocity curve of the Wolf-Rayet eclipsing system HD 214419 is obtained from measures on prismatic spectra of the Hell 5411 emission line. The shape of the velocity curve is unlike that obtained for Hell 4686. The emission ...
  • Effects of partial frequency redistribution with dipole scattering on the formation of spectral lines in expanding media 
    Peraiah, A (Indian Institute of Astrophysics, 1978)
    Line formation in expanding spherical atmospheres using partial frequency redistribution with dipole scattering has been studied by using a non LTE two level atom model. Lines with zero natural line widths are treated by ...
  • Reflection Nebula in the Far Ultraviolet: Icy Grains 
    Shah, G. A; Krishna Swamy, K. S (Indian Institute of Astrophysics, Bangalore, 1978)
    Some models of the reflection nebula in the form of homogeneous plane parallel slab containing singly scattering dirty ice grains as test case have been given. The three geometric cases of the star behind, within and in ...
  • The angular appearance of white holes 
    Narlikar, J. V; Kapoor, R. C (D. Reidel Publishing Company, 1978-01)
    It is shown that non-radial light rays emitted from the surface of a white hole can emerge from inside the Schwarzschild barrier. The upper limit on their impact parameter is calculated under the requirement that such rays ...
  • Radio frequency emission in electron beam-plasma and beam-beam interaction 
    Krishan, V; Sinha, K. P; Krishan, S (D.Reidel Publishing Co.,, 1978-01)
    A linear excitation of electromagnetic modes at frequencies ~_ (n+1/2)ωce , in a plasma through which two electron beams are contra-streaming along the magnetic field is investigated. This may be a source of the observed ...
  • The electronic band spectrum of Cal in the red region 
    Rao, M. L. P; Rao, D. V. K; Rao, P. T; Murthy, P. S (Polish Academy of Sciences, 1978-02)
  • On the occurrence of AQDs at Kodaikanal 
    Sastri, J. H; Murthy, B. S (The Council of Scientific and Industrial Research, 1978-02)
    A study is made of the occurrence of 'abnormal quiet days' (AQDs) at Kodaikanal (10 deg 14 min N, 77 deg 28 min E; dip 3.5 deg N) using H-field data over a 26-yr period (1950-1975). The results show distinctive differences ...
  • 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 ...
  • 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 ...
  • Equatorial irregularity belt and its movement during a magnetic storm 
    Vats, H. O; Chandra, H; Deshpande, M. R; Rastogi, R. G; Murthy, B. S; Janve, A. V; Rai, R. K; Singh, M; Gurm, H. S; Jain, A. R (Nature Publishing Group, 1978-03)
    GEOSTATIONARY satellites are able to monitor amplitude, phase, plane of polarisation (Faraday rotation) and group retardation of radio waves passing through the ionosphere with improved temporal resolution, although some ...

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