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Browsing Publications of Astronomical Society of India by Title

Browsing Publications of Astronomical Society of India by Title

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  • On the Pre-siddhantic evolution of the Indian calendar 
    Abhyankar, K. D (Astronomical Society of India, 1998)
  • On the problem of the Nova aquila III 
    Saha, M. N (Astronomical Society of India, 1920)
  • On the production of hydrocarbons in Titan's atmosphere 
    Saxena, P. P; Bhatnagar, S; Singh, M (Astronomical Society of India, 2003)
    The production of C(1 D) atoms and their role in the production of (C1, C2, C3, C4) hydrocarbons in Titan's atmosphere are discussed. The reaction between C(1 D) atom and H2 molecule to produce the methylidyne (CH) radical ...
  • On the progenitor of supernova 1987 A 
    Parthasarathy, M; Branch, D; Baron, E; Jeffery, D. J (Astronomical Society of India, 2006-12)
    A previously unpublished ultralow-dispersion spectrum of Sand- uleak -69 202, the stellar progenitor of SN 1987A, is presented and the uncertain presupernova evolution of Sanduleak -69 202 is discussed.
  • On the Rapid Variations of Solar Magnetic Fields 
    Venkatakrishnan, P; Kumar, B; Ravindra, B (Astronomical Society of India, 2003)
    We report on the rapid variations of solar magnetic fields that appear to be enhanced significantly above the background variability, at a few locations within the solar active regions, as observed with the Michelson Doppler ...
  • On the recurrence of sudden ionospheric disturbances 
    Shelke, R. N; Pande, M. C (Astronomical Society of India, 1984-09)
  • On the relation between large scale solar magnetic fields and filament positions 
    Shelke, R. N; Pande, M. C (Astronomical Society of India, 1983-12)
    Interrelationships of filament positions and large scale solar magnetic field structures are examined here. The broad neutral bands seem to be suitable locations for the formation and development of filaments. Filaments ...
  • On the relation between magnetic field strength and Wilson depression in sunspots 
    Bagare, S. P; Gupta, S. S (Astronomical Society of India, 1998)
    At the Solar Tower Telescope of Kodaikanal Observatory, we obtained Zeeman spectra of sunspots on their disk passage during 1979-84 (Solar max. 21). Using this data and full disk white light pictures obtained at the ...
  • On the Resolving Power of an Echelle Grating in the Presence of a Corrugated Wavefront of Incidence 
    Chatterjee, S; Banyal, R. K; Prasad, B. R; Chandrasekharan, K (Astronomical Society of India, 2003)
  • On the Rotational Temperature of TiO Sunspots 
    Sinha, K (Astronomical Society of India, 1977-06)
  • On the solar abundance of iron 
    Sinha, K; Sanwal, B. B (Astronomical Society of India, 1992)
    The MACKKL photospheric model and the latest oscillator strengths are used to obtain a solar abundance of iron close to the meteoritic value N(Fe) = 7.51 +/- 0.01. This helps to eliminate the discrepancy between photospheric ...
  • On the Solar Limb Darkening in the Wings of Some Atomic Hydrogen Lines 
    Bondal, K. R; Gaur, V. P; Pande, M. C (Astronomical Society of Indian, 1987-03)
    The centre-to-limb behaviour of the first four lines of the Balmer, Paschen, and Brackett series of atomic hydrogen at selected distances from the line centre, i.e. at delta lamda = 5, 10, 20 and 30 A has been theoretically ...
  • On the solar oscillator strength of SiH^{+} 
    Trivedi, C; Sinha, K (Astronomical Society of India, 1997)
    Rather contrasting values of the oscillator strengths for the (0,0) band of SiH+ molecules for the A 1II - X1 capital sigma+ transition have been reported in the literature. We investigate these with the help of a new set ...
  • On the stability of the hypothetical quintet system of TW Draconis 
    Abhyankar, K. D; Bhatia, R. K; Devadas Rao, P (Astronomical Society of India, 1985-09)
    Aarseth`s NBODY 1 code is used to study the stability of the quintet system of DW Draconis postulated by Abhyankar & Panchatsaram (1984). It is found that the observed (O - C) curve based on the ephemeris by Tremko & Kreiner ...
  • On the temperature distribuiton along a solar flare loop 
    Narain, Udit (Astronomical Society of India, 1983-03)
    We have obtained expressions for temperature distribution along a solar flare in the presence of a source of continued heating in constant cross section and line dipole geometries under nonstatic conditions. The quantitative ...
  • On the triggering of quiet region flares without filament activation 
    Sundararaman, K; Selvendran, R (Astronomical Society of India, 1997)
    Using Kodaikanal Observations we have analysed the cases of quiet region flares which are not associated with any filament activation. The rotations of the plages play a major role in triggering these spotless flares. The ...
  • On the Ultraviolet Fluxes of Be-Stars 
    Joshi, S. C; Rautela, B. S (Astronomical Society of Indian, 1987-12)
    The ultraviolet fluxes of a sample of Be and normal B stars taken from ultraviolet bright-star spectrophotometric catalogue and its supplement have been compared with model atmosphere fluxes. An ultraviolet temperature has ...
  • On the unusual surge of 1991 November 16 
    Bondal, K. R; Gaur, V. P; Joshi, A; Uddin, W; Pande, M. C (Astronomical Society of India, 1994)
    An unusually 'long' surge of 'short' duration occurred in the NW region of the sun's limb on 1991 November 16, around 04 15 UT. Time-lapse photographic observations employing a Halle H-alpha filter having a 0.5/0.7 A ...
  • The Ooty Summer Training Program 1990 
    Saikia, D. J; Salter, C. J; Banhatti, D. G; Ghosh, T; Gothoskar, P; Manoharan, P. K (Astronomical Society of India, 1991)
  • Ooty synthesis radio telescope - Design and performance 
    Sukumar, S et. al. (Astronomical Society of Indian, 1988)
    The principle, design and operational parameters of the Ooty synthesis radio telescope (OSRT) are described. It consists of thirteen elements including the Ooty Radio Telescope, which is divided into five parts. Operating ...

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