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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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  • Double pulsar system J0737-039 and its low-frequency observations with GMRT 
    Joshi, B. C; McLaughlin, M. A; Lyne, A. G; Kramer, M; Lorimer, D. R; Manchester, R. N; Camilo, F; Burgay, M; Possenti, A; Amico, N. D; Freire, P. C. C (Astronomical Society of India, 2004-09)
    The recent discovery of two radio pulsars, with periods of 23 ms and 2.8 s, in a tight 2.4 hour highly relativistic double neutron star binary, is one of the most significant discoveries of pulsar astronomy (Burgay et al. ...
  • Double ribbon flare of 1981 October 19 
    Verma, V. K; Pande, M. C (Astronomical Society of India, 1983-03)
    Photographic observations with a 0.7 A passband H-alpha Halle filter and morphological description of the double ribbon flare which occured near Halle plage region 17926 on 1981 October 19 are described. Initially the flare ...
  • A double-pass spectrograph for solar research 
    Kariyappa, R; Jayarajan, A. P; Raheem, K. C. A; Sivaraman, K. R (Astronomical Society of India, 1993-06)
    We have described the double-pass spectrograph built at the Indian Institute of Astrophysics. Measurements of the scattered light within the spectrograph using the photoelectric scans of the NaI D-lines show that this is ...
  • Drive control system for the TACTIC γ-ray telescope 
    Tickoo, A. K; Koul, R; Kaul, S. K; Kaul, I. K; Bhat, C. L; Bhatt, N (Astronomical Society of India, 1999)
    We present here some salient features of the hardware and software aspects of the 2-axes drive system developed for the TACTIC γ-ray telescope array. A test-report of its performance is also presented
  • A DSO-based system for temporal-profile extraction of atmospheric Cerenkov events 
    Tickoo, A. K; Kaul, S. K; Kaul, I. K; Koul, R; Bhat, C. L (Astronomical Society of India, 2000)
    The TACTIC array of Cerenkov telescopes, being set up at Mt. Abu, proposes to record time-profiles of atmospheric Cerenkov pulses with a view to exploit apparent differences in the associated time-parameters for a possible ...
  • Dust around Herbig Ae/Be stars: IRAS low resolution spectra 
    Bhatt, H. C; Gorti, U (Astronomical Society of India, 1993)
    IRAS low resolution spectra are presented for 17 Herbig Ae/Be stars. The observed spectral characteristics are correlated with reddening E(B-V) and the spectral type of the star. The silicate emission feature at 9.7 ...
  • The dust grains in the coma of Comet West 
    Krishna Swamy, K. S; Shah, G. A (D. Reidel Publishing Co, 1987-07)
    The observed variation of reddening as a function of the heliocentric distance and the spatial variation of reddening within the coma of Comet West in the visual wavelength range have been considered to infer the properties ...
  • Dust in an extragalactic environment : The case of NGC 2907 
    Patil, M. K; Pandey, S. K; Kembhavi, A. K; Singh, M (Astronomical Society of India, 2001)
    We have carried out a detailed CCD surface photometric analysis of the lenticular galaxy NGC 2907, containing multiple dust lanes, with the objective of studying properties of dust in an extragalactic environment. Measurements ...
  • Dust Properties in Early-type Galaxies 
    Patil, M. K; Sahu, D. K; Pandey, S. K; Kembhavi, A. K; Joshi, U. C; Baliyan, K. S; Singh, M (Astronomical Society of India, 2002-09)
  • Dwarf cepheid AD CMi -- revisited 
    Kilambi, G. C; Rahman, A (Astronomical Society of India, 1993-03)
    An analysis of UBVR light variations of AD Canis Minoris (CMi) is presented. The mean effective temperature derived from the intrinsic (B - V) index is estimated to be 7400 K +/- 100 K whereas that of the (V - R) index ...
  • Dwarf cepheid DY Pegasus -- revisited 
    Kilambi, G. C; Rahman, A (Astronomical Society of India, 1993)
    UBV broadband photoelectric photometry of dwarf cepheid DY Pegasus is presented. Using the observed light variations of this pulsating variable, mass, radius, gravity and temperature variations over a pulsational cycle ...
  • A Dynamic Sky Simulation for the Scanning Sky Monitor on ASTROSAT 
    Mishra, S. D; Bhattacharya, D (Astronomical Society of India, 2003)
    We have developed a dynamic sky simulation software for the visualization of the operation of the Scanning Sky Monitor cameras. This software can be used for the background modelling of the cameras and the refinement of ...
  • Dynamical effects of a cloud complex on stellar and HI components in a galaxy 
    Jog, C. J; Narayan, C. A (Astronomical Society of India, 2001)
    We investigate the dynamical effects of a molecular cloud complex with a mass ~ 107M? and a size of ~ few 100 pc, on the vertical distribution of stars and HI in a galactic disc. The complex has a strong local confining ...
  • Dynamical evolution of binary systems 
    Mohammed Alladin, S (Astronomical Society of India, 1990)
    The interaction of binary stars with single stars and the role of binary stars in star clusters are discussed. Some aspects of galaxy interactions are mentioned which can be viewed as analogs of binary-single body encounters ...
  • Dynamical modeling of elliptical galaxy NGC 2513 
    Thakur, P; Sahu, D. K; Chakraborty, D. K (Astronomical Society of India, 1999)
    We have analysed the photometric and kinematical data of the elliptical galaxy NGC 2513 to determine its intrinsic structure. For the photometric data we have used our own observations and for the kinematical data we have ...
  • Dynamical properties of flare Loops of 27 November 1996 
    Uddin, W; Lalan, P (Astronomical Society of India, 2001)
    We observed a post-flare loop system in Hα on the west limb on 27 November 1996 which started earlier than 05:07:20 UT in NOAA active region 7997 (N04, W89). The post-flare loops were associated with long duration x-ray ...
  • Dynamical properties of quiescent prominence in He D3 5876 Angstrom line emission 
    Prasad, C. D; Ambastha, A; Mathew, S. K (Astronomical Society of India, 1999)
    We have observed a quiescent prominence with the Coude spectrograph of Udaipur Solar Observatory during May 24-25, 1995. Analysis of two dimenstional spectroscopic data was carried out in order to obtain the line shifts ...
  • Dynamical Theory and Tidal Friction 
    Letton, C. T; Lee, W. A., eds. (Astronomical Society of India, 1914)
  • Dynamics of Limb Flare and Associated Primary and Secondary Post Flare Loops 
    Uddin, W; Joshi, B; Chandra, R; Joshi, A (Astronomical Society of India, 2003)
    In this paper we present the analysis of M 1.8 class (GOES SXR) limb flare and associated post flare loops of 2 May, 2001 which erupted on the west limb in NOAA 9433 (N15, W88). The flare started at around 00:32 UT from a ...
  • DZ Andromedae : A search for the spectral evidence of its possible RCB nature 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of India, 1999)
    The analysis of high-resolution spectra of DZ Andromedae, a suspected R Coronae Borealis variable, is presented here. The spectra of DZ And show the characteristics of a normal K2 III star, indicating that the star was ...

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