IIA Institutional Repository: Recent submissions

  • Pachmarhi array of Cerenkov telescopes 
    Bhat, P. N; Acharya, B. S; Chitnis, V. R; D'Souza, A. I; Francis, P. J; Gothe, K. S; John, A. V; Mazumdar, P; Nagesh, B. K; Purohit, P. N; Rahman, M. A; Rao, S. K; Rao, K. K; Sharma, S. K; Stanislaus, A. J; Sudershanan, P. V; Swamy, M. R. K; Upadhyaya, S. S; Murty, B. L. V (Astronomical Society of India, 2000)
    Pachmarhi Array of Cerenkov Telescopes (PACT) consisting of 25 telescopes has been installed at Pachmarhi (longitude : 76d 26' E, latitude : 22d 28' N and altitude : 1075m) recently. The telescopes are deployed in the form ...
  • A new automatic star tracker for balloon-borne astronomy instruments 
    Madhwani, P. P; Manchanda, R. K (Astronomical Society of India, 2000)
    The tracking of an astronomical object requires continuous updating of the look angles in azimuth and zenith. The mathematical calculation of these angles needs the position coordinates (latitude and longitude) of the place ...
  • Position sensitive proportional counter 
    Vadawale, S. V; Rao, A. R; Malkar, J. P (Astronomical Society of India, 2000)
    We are developing a Position Sensitive Proportional Counter for X-rays in the energy range from 2 keV to 20 keV. With the sensitive circular area of 30 mm diameter, it can be used as an imaging detector at the focal plane ...
  • Simultaneous imaging in optical and near-IR bands 
    Vadher, N. M; Shah, A. B; Shroff, A. J; Joshi, U. C (Astronomical Society of India, 2000)
    It is very important to have simultaneous observations in optical and near IR bands to understand several astrophysical phenomena. One problem is to know the nature of the central engine in blazars, which are in general ...
  • Site characteristics of The Indian Astronomical Observatory, Hanle 
    Bhatt, B. C; Prabhu, T. P; Anupama, G. C (Astronomical Society of India, 2000)
    A brief summary of site characteristics of Indian Astronomical Observatory, Hanle, Ladakh (altitude 4500 m), is presented based on a survey being carried out since the last four years.
  • Study of sky condition at Raipur and calibration of the photometer-telescope system 
    Padmakar; Barway, Sudhanshu; Pandey, S. K (Astronomical Society of India, 2000)
    To investigate local sky condition for valuable astronomical observation, we obtained values of atmospheric extinction coefficients in BVR filters for over 150 nights during the period of 1994 to 1997. Our observation over ...
  • Site characterization for the UPSO-TIFR telescope 
    Sagar, R; Uddin, W; Pandey, A. K; Stalin, C. S; Mohan, V; Sanwal, B. B; Gupta, S. K; Yadav, R. K. S; Durgapal, A. K; Joshi, S; Kumar, B; Gupta, A. C; Joshi, Y; Srivastava, J. B; Chaubey, U. S; Singh, M; Pant, P; Gupta, K. G; Padalia, T. D (Astronomical Society of India, 2000)
    The Uttar Pradesh State Observatory, Naini Tal and Tata Institute of Fundamental Research, Mumbai plan to install jointly a 3 metre size optical telescope at Devasthal located east of Naini Tal about 50 km by road. The ...
  • Photometric studies of starburst galaxies 
    Chitre, A. A (Astronomical Society of India, 2000)
    We present the results of a detailed morphological analysis of a sample of Markarian starburst galaxies. CCD surface photometry of those galaxies was carried out based on observations made in U BV RI and H?. The morphology ...
  • The collapse of voids in a Roberston-Walker universe with nonzero spatial curvature 
    Ray, M. K; Chaudhuri, S; Banerji, S (Astronomical Society of India, 2000)
    We consider the model of a spherical void (or its precursor) with heat conducting perfect fluid in Region I with Maiti metric (1982) surrounded by a spherical shell filled with radiation (Region II) having Vaidya metric. ...
  • CCD imaging of Seyfert galaxy NGC 1068 
    Lokanadham, B; Babu, G. S. D; Kiron, Y. R (Astronomical Society of India, 2000)
    CCD observations of NGC1068 have been obtained in BVRI filters with 2.34 meter Vainu Bappu Telescope of Kavalur in India. The contours of the indices B-V, B-I and V-I of the galaxy indicate the presence of the star-forming ...
  • Coordinated TeV gamma-ray and optical polarization study of BL Lac object Mkn 501 
    Joshi, U. C; Baliyan, K. S; Ganesh, S; Deshpande, M. R; Bhattacharyya, S; Kaul, R. K; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 2000)
    Coordinated TeV gamma-ray and optical polarization observations of the BL Lac object Mkn 501, carried out during 1997 with the TACTIC imaging Cerenkov telescope of the BARC and the 1.2 m Gurushikhar optical/IR telescope ...
  • Study of the emission line spectra and the stellar populations of starburst galaxies 
    Ravindranath, S; Prabhu, T. P (Astronomical Society of India, 2000)
    Based on the optical-NIR spectra, we discuss the nebular properties and stellar populations of starburst nuclei. Starbursts are found to have higher electron densities and higher excitations compared to HII nuclei. We find ...
  • On the interchange instability of solar magnetic flux tubes. II. The influence of energy transport effects 
    Bunte, M; Hasan, S. S; Kalkofen, W (European Southern Observatory, 1993-06)
    We examine the interchange instability of thin photospheric magnetic flux tube models which satisfy both force and energy balance with their surroundings. The stability of the tubes is independent of the efficiency of ...
  • Earth's equatorial ionosphere and the heliospheric current sheet 
    Sastri, J. H (D. Reidel Publishing Company, 1986-05)
    Evidence is presented to show that during epochs of high sunspot activity, the duration of manifestation of equatorial spread-F (ESF) irregularities in the Earth's equatorial ionosphere undergoes a systematic modulation ...
  • Seyferts at milli-arcsec scales 
    Lal, D. V; Shastri, P; Gabuzda, D (Astronomical Society of India, 2000)
    We have observed a sample of Seyfert galaxies using Global Very Long Baseline Interferometry at 5 GHz. Our goal is to investigate the systematics of their nuclear radio morphology on milli-arcsecond scales. We have chosen ...
  • Fresh results from modelling the gravitationally lensed system PKS 1830-211 
    Nair, S; Garrett, M. A (Astronomical Society of India, 2000)
    Fresh modelling of PKS1830-211 points to a perturbation in the NE image by a lens of globular cluster scale.
  • Tidal interactions in spherical galaxies 
    Namboodiri, P. M. S (Astronomical Society of India, 2000)
    Numerical simulations of equal mass galaxies, moving initially on a parabolic orbit, have been performed to see how the total energy of the system changes in close and wide encounters. The results are compared with those ...
  • Study of quasar broad emission region from spectroscopy of multiple images 
    Narasimha, D; Srianand, R (Astronomical Society of India, 2000)
    Using the high resolution radio observations and analysis of the broad emission lines as well as continum in the optical spectra of the multiple images of quasars, we provide a method to probe the structure and dynamics ...
  • CCD photometry of the Wolf Rayet galaxy Mink 
    Singh, M; Sanwal, B. B; Stalin, C. S (Astronomical Society of India, 2000)
    We present here the results from B and V photometric observations of the Wolf Rayet galaxy Mink which was observed through the 104 cm telescope of U.P. State Observatory using 1K x 1K CCD. The surface brightness profiles ...
  • R Coronae Borealis stars at minimum light - UW Cen 
    Kameswara Rao, N; Reddy, B. E; Lambert, D. L (Blackwell Publishing, 2004-12)
    Two high-resolution optical spectra of the R Coronae Borealis (R CrB) star UW Cen in decline are discussed. A spectrum from mid-1992 when the star had faded by 3 mag shows just a few differences with the spectrum at maximum ...

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