IIAP Publications: Recent submissions

  • Ba+ quadrupole polarizabilities: theory versus experiment 
    Sahoo, B. K; Das, B. P (American Physical Society, 2012-08)
    Three different measurements have been reported for the ground-state quadrupole polarizability in singly ionized barium (Ba+) which disagree with each other. Our calculation of this quantity using the relativistic ...
  • 1D radiative transfer models of 21 and 30 μm emission features in proto-planetary nebulae 
    Muthumariappan, C; Reddy, B. E (Cambridge University Press, 2012-08)
    Spectral energy distributions of six proto-planetary nebulae showing 21 and 30μ features were fit with models obtained from 1D radiative transfer code, taking FeO and MgS respectively are the carriers of the features. ...
  • ɛ Aur in eclipse: Post-AGB primary and disk-shaped secondary 
    Muthumariappan, C; Parthasarathy, M; Jayakumar, K; Appakutty, M (Cambridge University Press, 2012-08)
    We present physical and chemcal properties of the disk in the eclipsing binary system ɛ Aur by solving 2D radiative transfer problem. We also present preliminary results of our high resolution spectroscopic monitoring of ...
  • The solar cycle 
    Javaraiah, J; Rozelot, J. P; Bertello, L (Hindawi Publishing Corporation, 2012-06)
    The Sun provides variable energetic and magnetic field input to the conditions in the heliosphere which directly affect the magnetosphere. In particular, the Sun's variable magnetic fields constitute a rich source for ...
  • Optical and near-infrared survey of the stellar contents associated with the star-forming complex Sh2-252 
    Jose, J; Pandey, A. K; Ogura, K; Samal, M. R; Ojha, D. K; Bhatt, B. C; Chauhan, N; Eswaraiah, C; Mito, H; Kobayashi, N; Yadav, R. K (Wiley-Blackwell, 2012-08)
    We present the analyses of the stellar contents associated with the extended H ii region Sh2-252 using deep optical UBVRI photometry, slit and slitless spectroscopy along with the near-infrared (NIR) data from Two-Micron ...
  • The chemical composition of the post-asymptotic giant branch F supergiant CRL 2688 
    Ishigaki, M. N; Parthasarathy, M; Reddy, B. E; García-Lario, P; Takeda, Y; Aoki, W; García-Hernández, D. A; Manchado, A (Wiley-Blackwell, 2012-09)
    We present an analysis of a high-resolution (R ∼ 50 000) optical spectrum of the central region of the protoplanetary nebula CRL 2688. This object is thought to have recently moved off the asymptotic giant branch (AGB) and ...
  • An unusual very low-mass high-amplitude pre-main sequence periodic variable 
    Rodríguez-Ledesma, M. V; Mundt, R; Ibrahimov, M; Messina, S; Parihar, P. S; Hessman, F. V; Alves de Oliveira, C; Herbst, W (EDP Sciences, 2012-08)
    Aims. We have investigated the nature of the variability of CHS 7797, an unusual periodic variable in the Orion Nebula Cluster. Methods. An extensive I-band photometric data set of CHS 7797 was compiled between 2004−2010 ...
  • Multiwavelength intraday variability of the BL Lacertae S5 0716+714 
    Gupta, A. C; Krichbaum, T. P; Wiita, P. J; Rani, B; Sokolovsky, K. V; Mohan, Prashanth; Mangalam, A; Marchili, N; Fuhrmann, L; Agudo, I; Bach, U; Bachev, R; Böttcher, M; Gabanyi, K. E; Gaur, H; Hawkins, K; Kimeridze, G. N; Kurtanidze, O. M; Kurtanidze, S. O; Lee, C.-U; Liu, X; McBreen, B; Nesci, R; Nestoras, G; Nikolashvili, M. G; Ohlert, J. M; Palma, N; Peneva, S; Pursimo, T; Semkov, E; Strigachev, A; Webb, J. R; Wiesemeyer, H; Zensus, J. A (Wiley-Blackwell, 2012-09)
    We report results from a one-week multiwavelength campaign to monitor the BL Lacertae object (BL Lac) S5 0716+714 (on 2009 December 9–16). Nine ground-based telescopes at widely separated longitudes and one space-based ...
  • Investigation of variable star candidates in the globular cluster NGC 5024 (M53) 
    Bramich, D. M; Arellano Ferro, A; Figuera Jaimes, R; Giridhar, S (Wiley-Blackwell, 2012-08)
    We have performed a careful investigation of the 74 candidate variable stars presented by Safonova & Stalin. For this purpose we used our data base of imaging and light curves from Arellano Ferro et al. We find that two ...
  • 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 ...
  • 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 ...
  • 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. ...

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