IIA Institutional Repository: Recent submissions

  • 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. ...
  • On the possibility of nitrous oxide (N2O) as a cometary parent molecule in Comet 1P/Halley 
    Saxena, P. P (Astronomical Society of India, 2004-09)
    Nitrous oxide as a possible parent molecule in Comet 1P/Halley is discussed in light of in situ measurements and theoretical considerations. Hitherto undiscussed in cometary context, N2O could be a trace parent molecule ...
  • Occurrence of thermal instability in molecular clouds 
    Nejad-Asghar, M; Ghanbari, J (Astronomical Society of India, 2004-09)
    Linear perturbation is used on the complete MHD equations of the magnetic molecular clouds. We carry out a comparison of characteristic time-scales, and find conditions which linear thermal instability causes to form the ...
  • ARIES imaging polarimeter 
    Rautela, B. S; Joshi, G. C; Pandey, J. C (Astronomical Society of India, 2004-09)
    An Imaging Polarimeter has been fabricated for use with liquid- N2 cooled CCD camera and is designed to suit 104-cm Sampurnanand telescope with an f/13 focus at Aryabhatta Research Institute of Observational Sciences ...
  • A model of the stellar radiation field in the UV 
    Sujatha, N. V; Chakraborty, P; Murthy, J; Henry, R. C (Astronomical Society of India, 2004-09)
    This work is the first step in a systematic effort to understand and predict the different components of the UV (912 A - 3000 A) radiation field over the entire sky. We have developed a model to predict the ISRF in the UV ...
  • On gravitating stellar systems I. formulation using distribution function method 
    Pandey, U. S (Astronomical Society of India, 2004-09)
    An interesting work on self-gravitating gaseous disks has con- cerned the behaviour of the precursor of massive central dark object that might be the energy source existing at centers of galaxies and powering quasars. With ...
  • An implementation of transfer-pupil in a spectrograph on optical telescopes 
    Das, H. K; Kohok, A; Tandon, S. N (Astronomical Society of India, 2004-06)
    Based on the transfer pupil technique we develop a method to measure the lower order aberration coeffcients for optical telescopes; the method makes use of a Hartmann mask in a spectrograph for sampling the wavefront at ...
  • Variation of the Si II features in the chemically peculiar star - HD 115735 
    Sriraghavan, S. M; Jayakumar, K; Babu, G. S. D; Sujatha, S (Astronomical Society of India, 2004-06)
    The chemically peculiar star HD 115735 (= HR 5023 = 21 CVn) was observed with the 2.34 meter Vainu Bappu Telescope at Kavalur during the period of January 1999 to April 2000. A total of 47 spectrograms were obtained in the ...
  • Measurements of 220 GHz atmospheric transparency at IAO, Hanle, during 2000-2003 
    Ananthasubramanian, P. G; Yamamoto, S; Prabhu, T. P; Angchuk, D (Astronomical Society of India, 2004-06)
    A 220 GHz tipping radiometer was installed at the Indian Astronomical Observatory (IAO), Hanle (Latitude 32o46'46" N; Longitude 78o57'51" E; Altitude 4500 m, above msl) towards the end of December 1999. The system is in ...
  • Extra-solar system planets: searches, discoveries and characteristics 
    Trimble, V (Astronomical Society of India, 2004-06)
    The study of planets outside our solar system constitutes a new branch of astronomy that literally did not exist a decade ago. This discussion begins with how people have thought about other worlds in the past and some of ...
  • IR-IMAC - A developmental approach 
    Vidhya, V; Kamath, U. S; Vidhya, R (Astronomical Society of India, 2004-03)
    IR-IMAC is a multi-utility software package developed to remotely control the Near-Infrared imager installed on the 2-metre Himalayan Chandra Telescope at Mt. Saraswati, Hanle. The core idea in the development of IR-IMAC ...
  • CCD photometry of the unstudied galactic star clusters Be 10, Be 67 and To 5 
    Lata, S; Mohan, V; Pandey, A. K; Sagar, R (Astronomical Society of India, 2004-03)
    We present the broad band Johnson U BV and Cousins RI CCD photometric observations for open clusters Be 10, Be 67 and To 5. So far no photometric study of these clusters is published. The colour-magnitude diagrams indicate ...
  • Transfer of resonance line radiation in advected atmospheres with partial frequency redistribution of photons 
    Peraiah, A (Astronomical Society of India, 2004-03)
    We studied the influence of high veolcities of expansion on resonance line radiation by taking into account of aberration and advection. We used an angle averaged redistribution function RII in spherically symmetric media. ...
  • Spectrophotometry of the comet C/2002 V1 (NEAT) 
    Sanwal, B. B; Kumar, Brijesh Kumar (Astronomical Society of India, 2004-03)
    We took spectrophotometric observations of the coma of the comet C/2002 V1 (NEAT) on January 24, 25 and February 4, 2003, with 104-cm telescope of the State Observatory, Nainital. CN (3883 A) and C2 swan bands (4695, 5165 ...
  • Different distribution functions of solar x-ray flares 
    Das, T. K; De, B. K; Bhattacharyya, J (Astronomical Society of India, 2004-03)
    A statistical study has been done on soft x-ray (SXR) flares, the data of which were collected by Geostationary Operational Environmental Satellites (GOES) during the period July 1993?June 1994. From the analysis different ...
  • Binary accreting neutron star as a source of x-ray transients - Aql X-1, Cen X-4, 1608-522 
    Bardoloi, I; Baruah, Mon Moyuri (Astronomical Society of India, 2004-03)
    A thermonuclear model for x-ray transients has been considered to explain the observed characteristics of x-ray transient outbursts in Aql X-1, Cen X-4, 1608-522. The model is of a compact primary neutron star (NS) in a ...
  • Madras Observatory 
    Vagiswari, A; Birdie, C; Kameswara Rao, N (IIA Archives, 2006)
    Norman Robert Pogson was born at Nottingham, England on March 23, 1829. From an early age he showed great interest in astronomy. He was appointed as an astronomer in 1851 at the Bishops Observatory. He soon shifted to ...
  • Rotating compact star with superconducting quark matter 
    Panda, P. K; Nataraj, H. S (The American Physical Society, 2006-02)
    A compact star with superconducting quark core, the hadron crust and the mixed phase between the two is considered. The quark meson coupling model for hadron matter and the color flavor locked quark model for quark matter ...
  • Comments on `the white dwarf collapse in low mass binary systems' 
    Shylaja, B. S; Kochhar, R. K (D. Reidel Publishing Company, 1984-08)
    White dwarfs have been shown to possess high-angular momenta, in low-mass binary systems, in the context of formation of "spinars". Whether the collapse to a neutron star occurs spontaneously or is triggered by mass transfer ...
  • Very long period activity at the base of solar wind streams 
    Popescu, M. D; Banerjee, D; O`Shea, E; Doyle, J. G; Xia, L. D (EDP Science, 2005-11)
    Using time series data of spectral lines originating from a wide range of temperatures in the solar transition region, above a polar coronal hole, from SUMER (Solar Ultraviolet Measurements of Emitted Radiation) on SoHO ...

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