Publications of Astronomical Society of India: Recent submissions

  • Multinode data acquisition and control system for the Vertex Elements of the TACTIC telescope array 
    Yadav, K. K; Bhatt, N; Kaul, S. R; Koul, R (Astronomical Society of India, 2001)
    An interrupt based multinode data acquisition and control system has been developed for the three Vertex Elements of the TACTIC telescope array. The paper describes the salient design features of the hardware and software ...
  • Cosmic-ray mass composition investigations through atmospheric Cerenkov technique - a simulation study 
    Bhat, C. K; Kaul, R. K; Sapru, M. L; Bhat, C. L (Astronomical Society of India, 2001)
    The 4-element TACTIC Cerenkov telescope array at Mt. Abu comprises a central Imaging Element equipped with a 349- pixel Cerenkov imaging camera and three Vertex Elements, each of which is equipped with a special duplex ...
  • CCD photometry of galactic open star clusters - V. King 7 
    Durgapal, A. K; Pandey, A. K; Mohan, V (Astronomical Society of India, 1997)
    CCD observations of the open cluster King 7 and two nearby fields have been made in the UBVRI passbands down to V ~ 20.0 mag. From the colour-colour diagram the reddening is estimated to be 1.25mag. Comparison of the ...
  • 220 GHz tipping radiometer for monitoring atmospheric opacity at Hanle 
    Ananthasubramanian, P. G; Yamamoto, S; Prabhu, T. P (Astronomical Society of India, 2001)
    In this poster presentation, we describe the working principle, data acquisition method and data reduction scheme of a 220 GHz tipping radiometer. We also present the preliminary 220 GHz zenith optical depth results at Mt. ...
  • UPSO three channel fast photometer 
    Gupta, S. K; Sagar, R; Joshi, S; Ashoka, B. N; Babu, V. C; Seetha, S; Girish, V (Astronomical Society of India, 2001)
    The design and performance of a modular portable three channel fast photometer is described. It can be disassembled as single individual channels such that the system can also be used as a single channel photometer. The ...
  • Processing electronics instrumentation for the low energy detector of Solar X-ray Spectrometer (SOXS) experiment 
    Umapathy, C. N; Sharma, M. R; Solanky, C; Kulkarni, R; Shah, A. B; Vadher, N. M; Jain, R; Jain, A. K; Sreekumar, P (Astronomical Society of India, 2001)
  • Thermodynamic inflation 
    Sidharth, B. G (Astronomical Society of India, 1997)
    Using the well known fact that at very high temperatures, Bosons, and Fermions both satisfy the same energy, pressure and volume relation, we deduce an inflationary scenario for the early universe.
  • Small/automated telescopes and backend instrumentation for teaching purpose 
    Gupta, R (Astronomical Society of India, 2001)
    In the past decade, with the inception of IUCAA and other similar efforts from Universities and Institutes, several MSc teaching courses at Universities now offer Astronomy & Astrophysics as a special paper along with a ...
  • Ground-based - γ ray astronomy : Present status and future prospects 
    Bhat, C. L (Astronomical Society of India, 1997)
    In this article, we review the observational scene in ground based γ-ray astronomy as it has changed from a rather ambiguous exploratory-phase in the eighties to a more unequivocal consolidation–phase in the recent times. ...
  • Multi-aperture solar telescope 
    Venkatakrishnan, P (Astronomical Society of India, 2001)
    A proposal for a new ground based solar telescope of very high angular resolution is presented. The science goals that drive the need for this facility are enumerated. The proposed strategy, of combining several smaller ...
  • Gamma-ray astronomy activities in BARC - Past contributions and present challenges 
    Razdan, H; Bhat, C. L (Astronomical Society of India, 1997)
    It was in the early seventies that we made a modest start in the Nuclear Research Laboratory (NRL) of the Bhabha Atomic Research Centre (BARC) in the then-budding field of observational gamma-ray astronomy by setting up ...
  • Narrow-line Seyfert 1 galaxies 
    Dewangan, G. C (Astronomical Society of India, 2001)
    Narrow-line Seyfert 1 (NLS1) galaxies form a distinct subclass of Seyfert 1 galaxies. Optical spectroscopic and X-ray spectral and timing results on NLS1 and the plausible underlying physical parameters thought to be ...
  • Optical follow-up of GRB afterglows from UPSO, Naini Tal 
    Pandey, S. B; Sagar, R; Mohan, V; Pandey, A. K; Bhattacharya, D; Castro-Tirado, A. J (Astronomical Society of India, 2001)
    Successful optical photometric observations of five GRB afterglows namely GRB 990123, GRB 991208, GRB 991216, GRB 000301c and GRB 000926 have been carried out from State Observatory Naini Tal till 2000. The results and ...
  • Adiabatic cooling and nonthermal spectrum of blazars 
    Sahayanathan, S; Bhattacharyya, S; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 2001)
    Here we study the effect of adiabatic cooling on the non-thermal synchrotron spectra of blazars from radio to X-ray region resulting when blazars are in the flaring state.
  • 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 ...
  • Optical and near-IR imaging of dusty ellipticals 
    Pandey, S. K; Sahu, D. K; Kembhavi, A. K; McCarthy, P. J (Astronomical Society of India, 2001)
    In this paper we present some of the results of imaging observations of dusty ellipticals in the optical B & R bands as well as in near IR K'-band taken at the Las Campanas Observatory, Chile. We derive radial profiles of ...
  • Surface photometry of three Wolf-Rayet galaxies 
    Singh, M; Sanwal, B. B; Stalin, C. S (Astronomical Society of India, 2001)
    CCD photometric observations of the Wolf-Rayet galaxies NGC 1741, IIZw40 and IRAS 01003-2238 were taken with 104 cm telescope of the U.P. State Observatory NainiTal using 1024 x 1024 CCD camera in B V R I and H? filters. ...
  • Correlated projected properties of triaxial mass models 
    Thakur, P; Chakraborty, D. K (Astronomical Society of India, 2001)
    Triaxial mass models producing ellipticity variations and isophote twists are investigated. The spherical mass distributions are made triaxial by adding two more terms, each consisting of a radial function muliplied by a ...
  • A family of triaxial mass models : Analytical study of its projected properties 
    Das, M; Chakraborty, D. K (Astronomical Society of India, 2001)
    Triaxial modified Hubble mass models are studied. The models are more general than those studied by earlier workers. The potential and the projected surface density of the mass models can be calculated analytically. The ...
  • N-body simulations of galaxy collisions 
    Namboodiri, P. M. S; Sastry, K. S; Narasimhan, K. S. V. S (Astronomical Society of India, 2001)
    The tidal effects of close collisions between two spherical galaxies of different mass and mass distributions are studied by numerical simulations. The galaxies are represented by polytropes of indices n = 4 and n = 0 which ...

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