IIA Institutional Repository: Recent submissions

  • Extraction of Solid State Features of Carbon Dust Grains in the ISM, from X-Ray Absorption Studies 
    Manpreet Singh (Indian Institute of Astrophysics, 2010-06)
    The subject of dust formation in space is important in diverse environments. The formation of dust proceeds towards the formation of stellar objects and planets. So, it becomes very important for us to know the composition ...
  • The effect of electron scattering redistribution on atomic line polarization 
    Supriya, H. D; Nagendra, K. N; Sampoorna, M; Ravindra, B (Wiley-Blackwell, 2012-09)
    The polarization of spectral lines is generated by the scattering of angularly anisotropic incident radiation field on the atoms in the stellar atmosphere. This atomic scattering polarization is modified by frequency ...
  • Helicity Constrained Model of a Galactic Dynamo 
    Avijeet Prasad (Indian Institute of Astrophysics, 2010-06)
    Magnetic fields correlated on kiloparsec scales are seen in disc galaxies. The origin could be due to amplification of small scale seed fields by a turbulent dynamo. Helicity conservation imposes constraints on dynamo ...
  • Performance of 10.5μm quantum well infrared photodetector for astronomical applications 
    Joseph, Celine; Saxena, A. K (Department of Applied Optics and Photonics, University of Calcutta, 2011)
  • NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field 
    Wade, G. A; Maiz, J. A; Martins, F; Petit, V; Grunhut, J; Walborn, N. R; Barba, R. H; Gagne, M; Garcia-Melendo, E; Jose, J; Moffat, A. F. J; Naze, Y; Neiner, C; Pellerin, A; Penades, O. M; Shultz, M; Simon-Diaz, S; Sota, A (Wiley-Blackwell, 2012-09)
    This paper presents a first observational investigation of the faint Of?p star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission ...
  • Hot and cold spot counts as probes of non-gaussianity in the cosmic microwave background 
    Pravabati, C; Park, C; Yogendran, K. P; van de Weygaert, R (IOP Publishing, 2012-08-20)
    We introduce the numbers of hot and cold spots, n/subh/ and n/subc/, of excursion sets of the cosmic microwave background (CMB) temperature anisotropy maps as statistical observables that can discriminate different ...
  • Total solar eclipses of 1994 and 1995 
    Singh, J (Astronomical Society of India, 1994-09)
  • When The Sun Goes Out 
    Bappu, M. K. V (Indian Academy of Science, 2002-08)
  • Very low mass stellar and substellar companions to solar-like stars from MARVELS. II. A short-period companion orbiting an F star with evidence of a stellar tertiary and significant mutual inclination 
    Scott, W. F; Jian, G; Rory, B; Thomas, G. T; Justin, R. C; Nathan, D. L; Massimiliano, E; Bruno, F; Leticia, F; Bruce, G; Scott, G. B; Luan, G; Jonay, I. G. H; Leslie, H; Peng, J; Brian, L; Ben, N; Gustavo, F. P. M; Benjamin, J. S; Keivan, S; Todd, A. T; Benjamin, M. T; John, P. W; Michael, W. V. W; Eric, A; Carlos, A. P; Dmitry, B; Howard, B; Phillip, A. C; Louis, C; Korena, S. C; Luis, N. C; Melanie, L. G; Nelson, H; Stephen, R. K; Gary, R. L; Jian, L; Bo, M; Suvrath, M; Marcio, A. G. M; Elena, M; Viktor, M; Demitri, M; Duy Cuong, N; Daniel, O; Martin, P; Kaike, P; Joshua, P; Rafael, R; Eric, J. R; Basilio, X. S; Donald, P. S; Alaina, S; Audrey, S; Sivarani, T; Stephanie, S; Chelsea, L. M. V; Xiaoke, W; Ji, W; Benjamin, A. W; Gwendolyn, M. W; Bo, Z (IOP Publishing, 2012-09)
    We report the discovery via radial velocity (RV) measurements of a short-period (P = 2.430420±0.000006 days) companion to the F-type main-sequence star TYC 2930-00872-1. A long-term trend in the RV data also suggests the ...
  • Development of a temperature controller for the order-sorting interference filters 
    Banyal, R. K; Ravindra, B (Indian Institute of Astrophysics, 2012-08-01)
    A Fabry-Perot narrow band imager (NBI) is being built for solar studies at IIA [1]. The NBI has an order sorting pre- lter that selects an optical beam within desired wavelength band. A constant temperature is required ...
  • Vainu Bappu Telescope: Silver Jubilee 2011 
    Indian Institute of Astrophysics (Indian Institute of Astrophysics, 2011-08-10)
  • Transit of Venus (In Kannada) 
    Ragoonatha Chary, C (Indian Institute of Astrophysics, 2012-06)
  • Transit of Venus 
    Ragoonatha Chary, C (Indian Institute of Astrophysics, 2012-06)
  • Three-dimensional simulations of magnetohydrodynamic waves in magnetized solar atmosphere 
    Vigeesh, G; Fedun, V; Hasan, S. S; Erdelyi, R (IOP Publishing, 2012-08-10)
    We present results of three-dimensional numerical simulations of magnetohydrodynamic (MHD) wave propagation in a solar magnetic flux tube. Our study aims at understanding the properties of a range of MHD wave modes generated ...
  • Analysis of a fragmenting sunspot using hinode observations 
    Louis, R. E; Ravindra, B; Mathew, S. K; Bellot Rubio, L. R; Bayanna, A. R; Venkatakrishnan, P (IOP Publishing, 2012-08-10)
    We employ high-resolution filtergrams and polarimetric measurements from Hinode to follow the evolution of a sunspot for eight days starting on 2007 June 28. The imaging data were corrected for intensity gradients, projection ...
  • Intra-night optical variability of core dominated radio quasars: the role of optical polarization 
    Goyal, A; Gopal-Krishna; Wiita, P. J; Anupama, G. C; Sahu, D. K; Sagar, R; Joshi, S (EDP Sciences, 2012-08)
    Context. Rapid variations in optical flux are seen in many quasars and all blazars. The amount of variability in different classes of active galactic nuclei has been studied extensively but many questions remain unanswered. ...
  • Fine Structure in the Arc Spectra of Indium and Thallium 
    Narayan, A. L (Nature Publishing Group, 1931-10-17)
    Indium.-The hyperfine structures of a few indium arc lines have been reported by Jackson1 and McLennan.2 Jackson observed that each of the lines l2S½-22P½ and is a quartet; while McLennan observed only three components. ...
  • Spectra of doubly and trebly ionised thallium 
    Narayan, A. L; Pattabhi, P; Rao, A. S (Nature Publishing Group, 1929-09-20)
    CONTINUING our previous work on Tl II and Pb III, the spectra of Tl III and Tl IV have been under examination by us for some time past. A preliminary attempt, by the application of the X-ray doublet-laws, revealed a number ...
  • The second spark spectrum of lead 
    Rao, A. S; Narayan, A. L (Nature Publishing Group, 1929-11-23)
    THE second spark spectrum of lead was recently analysed by K. R. Rao and ourselves; and a preliminary report of the series regularities discovered was published in a paper (Ind. J. Phy., vol. 2, pt. 4, pp. 468-476.) We ...
  • Spectrum of doubly ionised arsenic 
    Rao, A. S; Narayan, A. L (Nature Publishing Group, 1929-08-10)
    THE deepest term of the separation of doubly ionised arsenic (As III) is 4p 2P1. The values of these doublet terms relative to 2G were reported in a recent paper (Ind. J. Phy., 5, 3, p. 3) to be 220, 221 cm.-1. It was found ...

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