IIA Institutional Repository: Recent submissions

  • Periodicity of the generating solutions of the restricted three-body problem in k three-dimensional coordinate system 
    Hassan, M. R (Astronomical Society of India, 2001)
    This paper deals with the periodicity of the generating solutions of the restricted three-body problem in three-dimensional coordinate system in KS-variables in the light of Krashinski (1963), Kurcheeva (1973) and Ahmad (1995).
  • Enhanced role of electron correlation in the hyperfine interactions in D5/22 states in alkaline-earth-metal ions 
    Sahoo, B. K; Sur, C; Beier, T; Das, B. P; Chaudhuri, R. K; Mukherjee, D (The American Physical Society, 2007-04)
    The low-lying n(=3,4,5)d 2D5/2 states of alkaline-earth-metal ions are of vital importance in a number of different physical applications. The hyperfine structure constants of these states are characterized by unusually ...
  • Dynamics of dwarf-spheroidals and the dark matter halo of the galaxy 
    Cowsik, R; Ratnam, C; Bhattacharjee, P; Majumdar, S (Elsevier B. V., 2007-08)
    The dynamics of the dwarf-spheroidal (dSph) galaxies in the gravitational field of the Galaxy is investigated with particular reference to their susceptibility to tidal break-up. Based on the observed paucity of the dSphs ...
  • Age Sequence in Small Clusters Associated with Bright-Rimmed Clouds 
    Ogura, K; Chauhan, N; Pandey, A. K; Bhatt, B. C; Ojha, D; Itoh, Y (Astronomical Society of Japan, 2007-02)
    Bright-rimmed clouds (BRCs) found in HII regions are probable sites of triggered star formation due to compression by ionization/shock fronts, and it is hypothesized that star formation proceeds from the exciting star(s) ...
  • Measurement of Kodaikanal White-Light Images: Relaxation of Tilts of Spot Groups as Indicator of Subsurface Dynamics of Parent Flux Loops 
    Sivaraman, K. R; Gokhale, M. H; Sivaraman, H; Gupta, S. S; Howard, R. F (The American Astronomical Society, 2007-03)
    We reexamine the evolution of the observed tilts θ of spot groups with life spans 2–7 days in the two latitude belts <13° and >13°. Using an iterative procedure, we refine the linear fit between θ and the daily tilt angle ...
  • Investigations of the Morphology of Dust Shells of Comet C/2001 Q4 (NEAT) 
    Vasundhara, R; Chakraborty, P; Muneer, S; Masi, G; Rondi, S (The American Astronomical Society, 2007-02)
    The morphology of the dust fans and shells in the images of comet C/2001 Q4 (NEAT) showed significant changes between 2004 April and June due to rapid changes in the Earth viewing and solar illumination geometry. We model ...
  • GRB 000926 and its optical afterglow : Another possible evidence for non-isotropic emission 
    Sagar, R; Pandey, S. B; Mohan, V; Bhattacharya, D; Castro-Tirado, A. J (Astronomical Society of India, 2001)
    The CCD Johnson BV and Cousins RI photomertric magnitudes are determined for 20 stars in the field of GRB 000926. They are used to calibrate the present R as well as published BVRI photometric magnitudes of the GRB 000926 ...
  • Measurements of photoinduced refractive index changes in bacteriorhodopsin films 
    Banyal, R. K; Prasad, B. R (Indian Academy of Sciences, 2007-03)
    We report the pump--probe measurements of nonlinear refractive index changes in photochromic bacteriorhodopsin films. The photoinduced absorption is caused by pump beam at 532 nm and the accompanying refractive ...
  • Theoretical studies of the 6sS1/22→5dD3/22 parity-nonconserving transition amplitude in Ba+ and associated properties 
    Sahoo, B. K; Das, B. P; Chaudhuri, R. K; Mukherjee, D (The American Physical Society, 2007-03)
    It is widely believed that the standard model of particle physics is just an intermediate step in understanding the properties of the elementary physics in nature and the interactions between them. Over the past twenty ...
  • First local helioseismic experiments with CO5 
    Steiner, O; Vigeesh, G; Krieger, L; Wedemeyer-Böhm, S; Schaffenberger, W; Freytag, B (WILEY-VCH Verlag GmbH & Co., 2007-03)
    With numerical experiments we explore the feasibility of using high frequency waves for probing the magnetic fields in the photosphere and the chromosphere of the Sun.We track a plane-parallel, monochromatic wave that ...
  • Spectroscopic observations of first ISOGAL sources 
    Ojha, D. K; Sivarani, T; Parthasarathy, M; Omont, A; Ganesh, S; Simon, G (Astronomical Society of India, 2000)
    Infrared Space Observatory Galactic (ISOGAL) survey at 7 and 15 μm of ~ 22 deg2 of the inner galactic disk and bulge, has detected several hundred thousand sources. Combining ISOGAL survey with I, J, H, Ks data of DENIS ...
  • Hubble Space Telescope and Optical Observations of Three Pulsating Accreting White Dwarfs in Cataclysmic Variables 
    Szkody, P; Mukadam, A; Gänsicke, B. T; Woudt, P. A; Solheim, Jan - Erik; Nitta, A; Sion, E. M; Warner, B; Sahu, D. K; Prabhu, T. P; Henden, A (University of Chicago Press, 2007-04)
    Ultraviolet observations using the Solar Blind Channel on the Hubble Space Telescope provide light curves and low-resolution spectra of three pulsating white dwarfs in the cataclysmic variables SDSS J013132.39−090122.3, ...
  • NIFS : A Near Infrared Imaging Fabry-Perot Spectrometer 
    Anandarao, B. G; Nanda Kumar, M. S; Jog, N. S; Patel, R. T (Astronomical Society of India, 2000)
    We describe here a Near-Infrared Imaging Fabry-Perot Spectrometer (NIFS ) operating in the K band to provide a maximum spectral resolution of 2000-3000 over two optional fields of view of ~ 2? x 2? and 4? x 4? with plate ...
  • Sky transparency over Naini Tal : A retrospective study 
    Kumar, B; Sagar, R; Rautela, B. S; Srivastava, J. B; Srivastava, R. K (Astronomical Society of India, 2000)
    We present an analysis of the atmospheric extinction coefficients measured during 1964 to 1999 in broad-band photometric passbands at U.P. State Observatory, Naini Tal. The extinction properties are also studied from the ...
  • Linear polarization of binaries II. Phase function : wQ~(µ)Q~' (µ') 
    Barman, S. K (Astronomical Society of India, 2000)
    This paper presents a method of calculating linear polarizations in close binaries whose surfaces are distorted due to tidal and rotational forces. Limb-darkening effect has been taken into account. Particles of different ...
  • Covariation of critical frequency of F2-layer and relative sunspot number 
    Chattopadhyay, R (Astronomical Society of India, 2000)
    Seasonal and overall covariation of relative sunspot number and the critical frequency of F2-layer of the terrestrial ionosphere has been investigated and the following results have been obtained; 1) There is a strong ...
  • Magnetic reconnection 
    Lakhina, G. S (Astronomical Society of India, 2000)
    Magnetic reconnection is considered as a basic plasma process which efficiently converts magnetic energy to plasma kinetic energy companied by changes in the topology of the magnetic field configuration. It prohibites the ...
  • Photometric study of distant open clusters in the second quadrant: NGC 7245, King 9, King 13 and IC 166 
    Subramaniam, A; Bhatt, B. C (Blackwell Publishing, 2007-05)
    We present a UBV CCD photometric study of four open clusters, NGC 7245, King 9, IC 166 and King 13, located between l = 90° and 135°. All are embedded in a rich Galactic field. NGC 7245 and King 9 are close together in the ...
  • Results from a spectroscopic survey in the CoRoT fields. I. Search for chromospherically active stars 
    Medhi, B. J; Messina, S; Parihar, P. S; Pagano, I; Muneer, S; Duorah, K (EDP Sciences, 2007-07)
    Aims.In this paper we report the results of the spectroscopic survey we carried out to detect chromospheric activity of late-type stars in the fields of view of the CoRoT space mission. Methods.We give an accurate MK ...
  • Observations of AGNs using PACT 
    Bose, D; Chitnis, V. R; Vishwanath, P. R; Majumdar, P; Rahman, M. A; Singh, B. B; Gupta, A. C; Acharya, B. S (Springer Netherlands, 2007-06)
    We report our observations on 4 AGNs viz, Mkn 421, Mkn 501, 1ES1426+428 and ON231 belonging to a sub-class called blazars. The observations were carried out using the Pachmarhi Array of Cherenkov Telescopes and span about ...

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