IIA Institutional Repository: Recent submissions

  • CCD photometry of the globular cluster NGC 5466. RR Lyrae light-curve decomposition and the distance scale 
    Arellano Ferro, A; Rojas López, V; Giridhar, S; Bramich, D. M (Blackwell Synergy, 2008-03)
    We report the results of CCD V and r photometry of the globular cluster NGC 5466. The difference image analysis technique adopted in this work has resulted in accurate time-series photometry even in crowded regions of the ...
  • The Chemical Compositions of the Type II Cepheids-The BL Herculis and W Virginis Variables 
    Maas, T; Giridhar, S; Lambert, D. L (University of Chicago Press, 2007-09)
    Abundance analyses from high-resolution optical spectra are presented for 19 type II Cepheids in the Galactic field. The sample includes both short-period (BL Her) and long-period (W Vir) stars. This is the first extensive ...
  • Brazilian Decimetric Array (Phase-I) 
    Sawant, H. S; Ramesh, R; Cecatto, J. R; Faria, C; Fernandes, F. C. R; Rosa, R. R; Andrade, M. C; Stephany, S; Cividanes, L. B. T; Miranda, C. I. A; Botti, L. C. L; Boas, J. W. S. V; Saito, J. H; Moron, C. E; Mascarenhas, N. D; Subramanian, K. R; Sundararajan, M. S; Ebenezer, E; Sankararaman, M. R (Springer Netherlands, 2007-05)
    An East – West, one-dimensional radio interferometer array consisting of five parabolic dish antennas has been set up at Cachoeira Paulista (longitude 45°0′20″ W, latitude 22°41′19″ S) for observations of the Sun and some ...
  • Detection of a new Be Star - gamma Lup 
    Ghosh, K. K; Kuppuswamy, K; Jaykumar, K; Rosario, M. J; Velu, C (Konkoly Observatory, 1987-08)
  • The dark nature of GRB 051022 and its host galaxy 
    Castro-Tirado, A. J; Bremer, M; McBreen, S; Gorosabel, J; Guziy, S; Fakthullin, T. A; Sokolov, V. V; González Delgado, R. M; Bihain, G; Pandey, S. B; Jelínek, M; de Ugarte Postigo, A; Misra, K; Sagar, R; Bama, P; Kamble, A. P; Anupama, G. C; Licandro, J; Pérez-Ramírez, D; Bhattacharya, D; Aceituno, F. J; Neri, R (EDP Sciences, 2007-11)
    Aims.We present multiwavelength (X-ray/optical/near-infrared/millimetre) observations of GRB 051022 between 2.5 h and ~1.15 yr after the event. It is the most intense gamma-ray burst (~10-4 erg cm-2) detected by HETE-2, ...
  • Some useful data for the astrophysical molecules AlS and BS 
    Karthikeyan, B; Rajamanickam, N; Bagare, S. P (Elsevier B.V, 2007-06)
    The vibronic (vibration-electronic) transition probability parameters such as Franck-Condon (FC) factors and r-centroids of diatomic molecular species could be useful in the identification of molecular lines and in the ...
  • On the Franck-Condon factors and R-centroids of the astrophysically interesting molecule CS 
    Karthikeyan, B; Raja, V; Rajamanickam, N; Bagare, S. P (National Library of Serbia, 2007-12)
    In molecular astrophysics, the Franck-Condon (FC) factors and r-centroids are essential for the interpretation of spectral intensities in terms of emitting astrophysical source conditions. They have been evaluated for the ...
  • Classification of colliding galaxies - II 
    Narasimhan, K. S. V. S; Alladin, S. M; Sastry, K. S (Astronomical Society of India, 2000)
    In our Paper I we had classified galaxies in increasing order of the intensity of tidal effects on the basis of transfer of energy from the motion of galaxies to the internal motions. This work has been refined by presenting ...
  • Probes of superclusters at moderate redshifts 
    Narasimha, D; Singh, K. P (Astronomical Society of India, 2000)
    Detection of superclusters at z = 0.2 - 1.0 and determination of their mass provide constraints on the theories of structure formation in the Universe. A combination of the study of hot gas observed in X-rays, and the ...
  • Limit on the average redshift of Gamma Ray Bursts from evolving galaxies 
    Jain, D; Panchapakesan, N; Mahajan, S; Bhatia, V. B (Astronomical Society of India, 2000)
    Identification of gravitationally lensed Gamma Ray Bursts (GRBs) in the BATSE 4B catalog can be used to constrain the average redshift <z> of the GRBs. Here we calculate an upper limit to <z>, independent of the physical ...
  • Multicolour broadband study of a lenticular galaxy : NGC 4753 
    Dewangan, G. C; Singh, K. P; Bhat, P. N (Astronomical Society of India, 2000)
    Based on VBT observations, we report multicolour broadband study of a lenticular galaxy, NGC 4753 with prominent dust lanes. The extinction curve derived for NGC 4753 is similar to the Galactic extinction curve. The dust ...
  • 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 ...

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