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  • 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 ...
  • Indian Institute of Astrophysics Annual Report: 1977-78 
    Bappu, M. K. V (Indian Institute of Astrophysics, 1978)
  • 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 ...
  • Scanning the sky from Kavalur 
    The Hindu (The Hindu, 1978-02-12)
  • 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 ...
  • Round Table Conference on `Training Requirements of Astronomers in India 
    Abhyankar, K. D (Astronomical Society of India, 1978-03)
  • Hard X-Ray Flares from the Sun 
    Bhatia, V. B (Astronomical Society of India, 1978-03)
    A review of solar flare hard X-rays is presented. Various features of these flares have been considered to pinpoint the location of the source of emission and the nature of the emission of these flares. It is shown that ...
  • Study of the Galactic Cluster NGC 581 
    Sagar, R; Joshi, U. C (Astronomical Society of India, 1978-03)
    Photoelectric magnitudes and colours in the UBV system have been determined for 73 stars in NGC 581. The value of the interstellar reddening is 0m.38. The distance modules to the cluster is estimated at 12m.16 plus or ...
  • RS Canum Venaticorum Binaries 
    Eggleton, P. P (Astronomical Society of India, 1978-03)
    Some properties of the RS CVn suntype of eclipsing binaries can be explained in terms of observational selection. Provided that the components of a binary are (a) the sameage, and (b) too small relative to their Roche lobes ...
  • Total Solar Eclipse of 1980 
    Bhattacharyya, J. C (Astronomical Society of India, 1978-03)
  • Report on the 15th International Cosmic Ray Conference 
    Daniel, R. R (Astronomical Society of India, 1978-03)
  • On the infrared bands of a A10 related to Mira phenomena 
    Murty, P. S (D. Reidel Publishing Company, 1978-04)
    The calculated band positions and intensity factors for the bands of the infrared A-X transition of A10 suggest that an investigation for the infrared bands in the 1 to 5 micron region of the spectra of Mira stars and M ...
  • Diurnal behaviour of midlatitude F-region parameters in summer 
    Sastri, J. H (National Institute of Science Communication and Information Resources, CSIR, 1978-04)
    Some aspects of the day-to-day variations in the diurnal behavior of F-region total electron content (TEC) and peak electron density (NmF2) at midlatitudes during summer months are studied using systematic and extensive ...
  • Equivalent width of OI λ7774 and absolute magnitude relation for F and G supergiants 
    Kameswara Rao, N; Mallik, S. G. V (Royal Astronomical Society, 1978-04)
    Luminosity calibration is established for F5-G2 supergiants using the equivalent width measures of OI λ7774 and FeI λ7748

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