Publications of Astronomical Society of India: Recent submissions

  • Morphological properties of short duration Gamma Ray Bursts 
    Gupta, V; Gupta, P. D; Bhat, P. N (Astronomical Society of India, 2000)
    In this paper, we study a sample of short duration bursts contained in the 3B BATSE catalogue. We fit the time profiles of these GRBs with lognormal functions and study various temporal properties of these objects. In most ...
  • Linear sizes and arm asymmetry of intrinsically symmetric doubles 
    Banhatti, D. G (Astronomical Society of India, 2000)
    In an intrinsically symmetric model, the distribution px(x) of the fractional arm differences x of a sample of straight double radio sources reflects the distribution among the doubles of their orientations away from the ...
  • Some home-truths about small samples and counting statistics 
    Salter, C. J; Banhatti, D. G (Astronomical Society of India, 2000)
    Assessing a fluctuation in the sky density of astronomical objects uses counting (i.e., Poisson) statistics for estimating the errors. For a finite sample, there is a limit to the maximum possible fluctuation from the mean ...
  • Kinematics of molecular gas in the nucleus of barred galaxies : NGC 253 and M82 
    Das, M (Astronomical Society of India, 2000)
    In more than half of all observed spiral galaxies, the central molecular gas is distributed in a bar. Since gas is a dissipative fluid, it will tend to settle along closed orbits in the plane of a galaxy. Simulations of ...
  • Lopsided spiral galaxies 
    Jog, C. J (Astronomical Society of India, 2000)
    The light distribution in disks of many spiral galaxies is non-axisymmetric or 'lopsided' with a spatial extent much larger along one half of a galaxy than the other, as in M101. Recent observations show that 30% of spiral ...
  • Evolution of the magnetic field in accreting neutron stars 
    Konar, S (Astronomical Society of India, 2000)
    There has been sufficient observational indication suggesting a causal connection between the binary history of neutron stars and the evolution of their magnetic field. In particular, it is believed that the generation of ...
  • Pulsar scintillation and the local interstellar medium 
    Bhat, N. D. R (Astronomical Society of India, 2000)
    Ever since their discovery, pulsars have been proved to be excellent tools to study the Interstellar Medium. Results from new observations using the Ooty Radio Telescope at 327 MHz are used to investigate the properties ...
  • Studies of classical novae and related objects 
    Kamath, U. S (Astronomical Society of India, 2000)
    This thesis is based on studies of two classical novae - V1425 Aquilae (J H K photometry and optical spectroscopy) and V723 Cassiopeiae (J H K photometry) and a sample of symbiotic stars (J H K photometry and Circular ...
  • Photometric studies of close binary systems 
    Varricatt, W. P (Astronomical Society of India, 2000)
    Two eclipsing binary stars of the Algol type, RZ Cassiopeiae and R Canis Majoris, are observed in the near IR photometric bands J and K and the light curves are analysed using the Wilson - Devinney light curve synthesis ...
  • 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 ...
  • 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 ...

Search DSpace


Browse

My Account