IIA Institutional Repository: Recent submissions

  • Scattering in a parabolic encounter of a single star with a circular binary 
    Hasan, S. N; Tagare, S. G; Alladin, S. M (Astronomical Society of India, 2000)
    Huang and Valtonen (1987) obtained an analytic expression for the energy transfer in a parabolic encounter of a single star with a circular binary keeping terms of the first order in a/q where a is the radius of the circular ...
  • Photoionization cross sections for the Fe XVII ion 
    Baliyan, K. S; Joshi, U. C (Astronomical Society of India, 2000)
  • Local stability criterion for a two component galactic disk 
    Jog, C. J (Astronomical Society of India, 2000)
    The criterion for stability against local, axisymmetric perturbations in gravitationally coupled stars and gas in a galactic disk is obtained. The new feature is the inclusion of both stars and gas in the study, and a ...
  • An Evolved Disk Surrounding the Massive Main-Sequence Star MWC 297? 
    Manoj, P; Ho, P. T. P; Ohashi, N; Zhang, Q; Hasegawa, T; Chen, H - R; Bhatt, H. C; Ashok, N. M (University of Chicago Press, 2007-10)
    We present the results of the interferometric observations of the circumstellar disk surrounding MWC 297 in the continuum at 230 GHz (1.3 mm) and in the () rotational transitions of 12CO,13CO, and C18O using the Submillimeter ...
  • Champagne flow and triggered star formation in NGC 1893 
    Maheswar, G; Sharma, S; Biman, J. M; Pandey, A. K; Bhatt, H. C (Blackwell Synergy, 2007-08)
    Using Hα grism spectroscopy and optical and Two-Micron All-Sky Survey photometry of the fields containing NGC 1893 and two emission nebulae, Sim 129 and Sim 130, we show the presence of a number of Hα and near-infrared ...
  • Hanle-Zeeman Redistribution Matrix. II. Comparison of Classical and Quantum Electrodynamic Approaches 
    Sampoorna, M; Nagendra, K. N; Stenflo, J. O (University of Chicago Press, 2007-12)
    The Hanle-Zeeman redistribution matrix accounts for the intricately coupled correlations in frequency, angle, and polarization between the incoming and outgoing radiation and embodies the physics of the scattering process. ...
  • Chemical evolution of intermediate mass nuclei in the solar neighbourhood and the halo of the galaxy 
    Goswami, A; Prantzos, N (Astronomical Society of India, 2000)
    Recent observations of Fe group elements in very low metallicity stars show an evolutionary trend very different from that of Fe, implying divergent paths of chemical evolution for these elements. In the present work we ...
  • Abundance analysis of extreme helium stars 
    Pandey, G; Kameswara Rao, N; Lambert, D. L; Jeffery, C. S; Asplund, M (Astronomical Society of India, 2000)
    High resolution spectra were obtained for a sample of hydrogen-deficient stars which are hotter than the R CrB stars and cooler among the extreme helium stars (EHe). We believe that these stars are transition objects ...
  • Whither strange pulsars? 
    Konar, S (Astronomical Society of India, 2000)
    It has been argued that some of the pulsars could be strange stars because these too are capable of supporting fast rotations observed in pulsars. We examine this claim from the point of view of the evolution of magnetic ...
  • Window-threshold technique for detecting pulse components 
    Gangadhara, R. T (Astronomical Society of India, 2000)
    We have analysed high-quality single pulse data of PSR B0329+54 at 606 MHz to study the structure of the emission beam. In order to unambiguously detect weak emission components in the integrated pulse profile, we have ...
  • Statistics of occurrence of giant pulses from PSR 0950+08 
    Singal, A. K; Vats, H. O; Deshpande, M. R (Astronomical Society of India, 2000)
  • Study of two pulsars with the Indian X-ray Astronomy Experiment 
    Mukerjee, K; Agrawal, P. C; Paul, B; Rao, A. R; Yadav, J. S; Seetha, S; Kasturirangan, K (Astronomical Society of India, 2000)
    The X-ray pulsars Cep X-4 and 4U 1907+09 were observed with the Indian X-ray Astronomy Experiment (IXAE). Observations of Cep-X4 were made during the declining phase of its latest 30 days outburst in 1997, July-August. The ...
  • The X-ray observation of newly discovered transient XTE J1748-288 by the Indian X-ray Astronomy Experiment 
    Naik, S; Agrawal, P. C; Paul, B; Rao, A. R; Seetha, S; Kasturirangan, K (Astronomical Society of India, 2000)
    The observations of X-ray transient XTE J1748-288 were made in the energy band 2 - 18 keV with the Indian X-ray astronomy experiment (IXAE) during 1998, June 14-25 with total useful exposure of 27,100 second for 1 sec ...
  • 20-200 keV observations of binary X-ray sources with a balloon-borne payload 
    Manchanda, R. K (Astronomical Society of India, 2000)
    The spectral information in the hard X-ray energy region above 30 keV is available only for a small number of X-ray objects even though hard X-ray flux has been observed from about 80 of the 200,000 X-ray sources cataloged ...
  • Near absence of hard X-ray pulsation from GS 1843+00 in the middle of burst phase 
    Manchanda, R. K (Astronomical Society of India, 2000)
    Hard X-ray transient pulsar GS 1843+00 was observed in the 20-200keV region using a high sensitivity large area scintillation counter instrument during its 1997 flare on March 30. The data indicates a near absence of 29.5s ...
  • Radio emission from Cyg X-3 
    Apparao, K. M. V (Astronomical Society of India, 2000)
    The acceleration of high energy particles by a shock produced by the passage of the secondary object in the binary system, through the wind of the primary, is considered and is shown to be adequate to account for the ...
  • Hard X-rays and gamma rays from the Be star LSI +61-303 
    Apparao, K. M. V (Astronomical Society of India, 2000)
    The hard x-ray flux resulting from inverse Compton scattering of photons from the Be star by the high energy electrons responsible for the radio emission, is calculated and compared with observation.
  • Optical spectroscopy of SN1998S 
    Anupama, G. C; Pandey, G; Sivarani, T (Astronomical Society of India, 2000)
  • Near-infrared spectroscopy of nova Sagittarii 1998 
    Ashok, N. M; Chandrasekhar, T (Astronomical Society of India, 2000)
    Near-infrared spectra of Fe-II type nova, Nova Sagittarii 1998 obtained during the period 30 to 70 days after the discovery date are presented. The near infrared spectrum is dominated by emission lines of hydrogen and ...
  • The merger time of binary globular clusters 
    Ballabh, G. M; Alladin, S. M (Astronomical Society of India, 2000)
    In a binary globular cluster the tidal forces increase the internal energy of the clusters and may lead to either merger or disruption of a cluster depending upon whether the two clusters are !of equal mass or vary much ...

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