IIA Institutional Repository: Recent submissions

  • Hanle-Zeeman Redistribution Matrix. III. Solution of the Polarized Line Formation Problem 
    Sampoorna, M; Nagendra, K. N; Stenflo, J. O (The American Astronomical Society, 2008-05)
    The polarized radiative transfer equation is solved numerically, taking into account both the Zeeman absorption matrix and the Hanle-Zeeman redistribution matrix, to obtain line profiles for arbitrary magnetic field ...
  • Infrared and radio observations towards the ultracompact HII region IRAS 19111+1048. 
    Vig, S; Ghosh, S. K; Kulkarni, V. K; Ojha, D. K; Verma, R. P (Astronomical Society of India, 2003)
    Southern HII region RCW 116B (IRAS 16571-4029) has been mapped simultaneously at two far infrared wavelengths (at 150 and 210 μm) with a resolution of ~1 using the TIFR 1 m balloon-borne telescope. High angular resolution ...
  • On the Weakening of the Chromospheric Magnetic Field in Active Regions 
    Nagaraju, K; Sankarasubramanian, K; Rangarajan, K. E (The American Astronomical Society, 2008-05)
    Simultaneous measurement of line-of-sight (LOS) magnetic and velocity fields at the photosphere and chromosphere are presented. The Fe i line at λ6569 and Hα at λ6563 are used for deriving the physical parameters at ...
  • A Multiwavelength Study of the Galactic Star Forming Region Associated with IRAS 20255+3712 / S 106 
    Ghosh, S. K; Kulkarni, V. K; Ojha, D. K; Verma, R. P (Astronomical Society of India, 2003)
    The Galactic star forming region associated with IRAS 20255+3712 / S 106 has been mapped simultaneously in 150 and 210 μm bands using the TIFR 1-metre balloon borne far-infrared (FIR) telescope with an angular resolution ...
  • Gamma ray bursts at high energies : detection ranges and event rates 
    Shanthi, K; Kaul, C. L; Kaul, R. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    The Gamma-Ray Burst (GRB) detection rates at energies ? 20GeV, have been estimated for the 3 atmospheric Cerenkov telescope systems of the GRACE project at Mt. Abu, under the assumption that the bursts have a cosmological ...
  • A Study of the Galactic Star Forming Region IRAS 02593+6016 / S 201 in Infrared and Radio Wavelengths 
    Ojha, D. K; Ghosh, S. K; Kulkarni, V. K; Testi, L; Verma, R. P; Vig, S (Astronomical Society of India, 2003)
    We present infrared and radio observations of IRAS 02593+6016 / S 201 star forming region. A young star cluster is observed in this region, which contains different classes of young stellar objects. The near-infrared (NIR) ...
  • A new computer-controlled multi-channel high voltage supply system for GRACE instrumentation 
    Manna, A; Chakrabarti, S; Mukhopadhayay, P. K (Astronomical Society of India, 2002)
    The high energy gamma ray telescopes being set up by the Bhabha Atomic Research Institute Centre (BARC) at Mt. Abu, Rajasthan, as part of the GRACE project, require a very large number (~ 1000) of programmable high voltage ...
  • Near Infrared Photometry of the Young Star Cluster NGC 2384 
    Hasan, P; Kilambi, G. C; Baliyan, K. S (Astronomical Society of India, 2003)
    This work involves near infrared photometry of the young cluster NGC 2384. Observations were taken at the Mt Abu Infrared Observatory using the NIC-MOS3 detector in February 2000. The distance to the cluster is obtained ...
  • Active mirror alignment control system for the MACE telescope 
    Kulgod, S. V; Pious, L; Chadda, V. K; Kaul, S. R; Yadav, K. K.; Koul, R (Astronomical Society of India, 2002)
    The conceptual design of an active mirror contol system for the MACE telescope, being set up by the Bhabha Atomic Research Centre at Mt. Abu, is described. Preliminary results obtained from recent laboratory trials are ...
  • Focal plane instrumentation of the MACE telescope 
    Bandyopadhyay, K; Suthar, R. L; Guha, S; Koul, R (Astronomical Society of India, 2002)
    The 17m MACE telescope will employ high-resolution MACE imaging camera consisting of 832 PMTs and low resolutioon BEST camera consisting of 108 PMTs for ?-ray astronomical experiments. To enhance the duty cycle of the ...
  • Study of Old Open Clusters NGC 1605, Czernik 18, NGC 2509 
    Sujatha, S; Babu, G. S. D (Astronomical Society of India, 2003)
    We present the first CCD photometric UBVRI observations of three open clusters NGC 1605 (OCI 406), Czernik 18 (OCI 426) and NGC 2509 (OCI 630) obtained by using the 1.02 m telescope at Vainu Bappu Observatory, Kavalur. ...
  • RACE-OC project: rotation and variability in the open cluster NGC 2099 (M 37) 
    Messina, S; Distefano, E; Parihar, P. S; Kang, Y. B; Kim, S. -L; Rey, S. -C; Lee, C. -U (EDP Sciences, 2008-05)
    Context. Rotation and solar-type magnetic activity are closely related to each other in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on star's rotation, and rotation ...
  • Distributed data acquisition system for Pachmarhi array of Cverenkov telescopes 
    Upadhya, S. S; Acharya, B. S; Bhat, P. N; Chitnis, V. R; D'Souza, A. I; Francis, P. J; Gothe, K. S; Joshi, S. R; Majumdar, P; Manogaran, M; Nagesh, B. K; Pose, M. S; Purohit, P. N; Rahman, M. A; Rao, K. K; Rao, S. K; Sharma, S. K; Singh, B. B; Stanislaus, A. J; Sudersanan, P. V; Venkatesh Murthy, B. L; Vishwanath, P. R (Astronomical Society of India, 2002)
    Pachmarhi Array of Cverenkov Telescopes consists of 25 Telescopes distributed within an area of 8000m2. The array was designed to detect and process faint Cverenkov light flashes that lasts for a few nanoseconds, produced ...
  • Mechanical design improvements in the "TACTIC" gamma-ray telescope 
    Suthar, R. L; Guha, S; Biswas, P. K; Koul, R; Aggarwal, N. K (Astronomical Society of India, 2002)
    The basic mechanical design of the TACTIC (TeV Atmospheric Cerenkov Telescope with Imaging Camera) telescope was received from the Lebedev Institute of the Academy of Physical Sciences, Moscow, in November 1990. A large ...
  • Multinode data acquisition and control system for the 4-element TACTIC telescope array 
    Yadav, K. K; Chouhan, N; Kaul, S. R; Koul, R (Astronomical Society of India, 2002)
    An interrupt driven multinode data acquisition and control system has been developed for the 4-element gamma-ray telescope array, TACTIC. Computer networking technology and the CAMAC bus have been integrated to develop ...
  • Auxiliary control systems for Pachmarhi array of Cverenkov telescopes 
    Gothe, K. S; Acharya, B. S; Bhat, P. N; Chitnis, V. R; D'Souza, A. I; Francis, P. J; John, A. V; Joshi, S. R; Majumdar, P; Nagesh, B. K; Pose, M. S; Purohit, P. N; Rahman, M. A; Rao, K. K; Rao, S. K; Sharma, S. K; Singh, B. B; Stanislaus, A. J; Sudershanan, P. V; Upadhya, S. S; Venkateshmurthy, B. L; Vishwanath, P. R (Astronomical Society of India, 2002)
    Pachmarhi Array of Cverenkov Telescopes (PACT) consists of 25 Telescopes deployed over an area of 100m x 80m. The experiment is based on atmospheric Cverenkov technique to detect Very High Energy celestial gamma-rays using ...
  • Crustal stress patterns: Analysis of Ps splitting for seismic anisotropy 
    Rai, Abhishek; Rai, S. S; Gaur, V. K (Indian Academy of Sciences, 2008-04)
  • Angular resolution of Pachmarhi array of Cverenkov telescopes 
    Majumdar, P; Acharya, B. S; Bhat, P. N; Chitnis, V. R; Rahman, M. A; Singh, B. B; Vishwanath, P. R (Astronomical Society of India, 2002)
    Pachmarhi Array of Cverenkov Telescopes (PACT), consisting of a distributed array of 25 telescopes is used to sample the atmospheric Cverenkov Photon showers. The shower front is fitted to a plane and the direction of ...
  • Recent results on crab nebula and Mkn-421 observations with TACTIC imaging element 
    Bhatt, N; Agarwal, N. K; Bhat, C. K; Bhattacharaya, S; Charagi, S. K; Chandra, P; Chauhan, N; Dhar, V. K; Goyal, A; Goyal, H. C; Kamath, K; Kaul, C. L; Kaul, I. K; Kaul, R. K; Kaul, S. K; Kaul, S. R; Sharma, M; Kothari, M; Kotwal, S. V; Koul, D. K; Koul, M. K; Rannot, R. C; Razdan, A. K; Sahaynathan, S; Sapru, M. L; Satyabhama, N; Tickoo, A. K; Venugopal, K; Yadav, K. K; Bhat, C. L (Astronomical Society of India, 2002)
    The results of our recent observational campaigns on the Crab Nebula and Mkn-421, carried out with the 349-pixel Imaging Element of the TACTIC array, are presented alongwith the details of the data analysis. Analysis of ...
  • Towards absolute gain calibration of the TACTIC imaging element 
    Tickoo, A. K; Dhar, V. K; Venugopal, K; Yadav, K. K; Kaul, S. K; Koul, R; Kothari, M. K; Goyal, H. C; Chandra, P; Bhatt, N; Bhat, C. L (Astronomical Society of India, 2002)
    The imaging element of the 4-element TACTIC telescope array has been in operation at Mt. Abu since 1997, for carrying out detailed investigations of gamma-ray sources in the TeV energy range. In order to characterize the ...

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