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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Irregular Singularity of the Magnetorotational Instability in a Keplerian Disk 
    Furukawa, M; Yoshida, Z; Hirota, M; Krishan, V (University of Chicago Press, 2007-04)
    The center of a Keplerian disk is an irregular singularity for the eigenfunctions of magnetorotational instabilities. The system is studied using the small-radius approximation, which by no means implies that the analysis ...
  • Is 21-cm absorption associated with the emission-line regions of quasars? 
    Krishan, V (Royal Astronomical Society, 1988-03)
    The 21-cm absorption line observed in several QSO systems is believed to originate in neutral hydrogen clouds in the vicinity of the QSOs. The aim of this paper is to show that 21-cm absorption can also originate in a ...
  • Is a Deep One-cell Meridional Circulation Essential for the Flux Transport Solar Dynamo? 
    Hazra, G; Karak, B. B; Choudhuri, A. R (IOP Publishing, 2014-02-20)
    The solar activity cycle is successfully modeled by the flux transport dynamo, in which the meridional circulation of the Sun plays an important role. Most of the kinematic dynamo simulations assume a one-cell structure ...
  • Is DZ Andromedae an R Coronae Borealis variable? 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (The Observatory, 1998-08)
    The variable star DZ Andromedae has been suspected to be an R Coronae Borealis variable. Our analysis of a high-resolution spectrum shows that the star has been misclassified: the spectrum resembles that of a K giant. We ...
  • Is LR SCO and RCB star? 
    Giridhar, S; Kameswara Rao, N; Lambert, D. L (The Observatory, 1990-08)
  • Is the binding energy of galaxies related to their core black hole mass? 
    Sivaram, C; Arun, K (Indian Academy of Sciences, 2021-10)
    Most of the large galaxies host a supermassive black hole, but their origin is still not well understood. In this paper, we look at a possible connection between the gravitational binding energies of large galaxies, etc., ...
  • Is the Hubble flow a result of inverse cascade? 
    Krishan, V (Indian Academy of Sciences, 1996-10)
  • Is the observable Universe consistent with the cosmological principle? 
    Aluri, Pavan Kumar; Cea, Paolo; Pravabati, C; Chu, Ming-Chung; Clowes, Roger G; Hutsemekers, Damien; Kochappan, Joby P; Lopez, Alexia M; Liu, Lang; Martens, Niels C. M; Martins, C. J. A. P; Migkas, Konstantinos; Colgain, Eoin O; Pranav, Pratyush; Shamir, Lior; Singal, Ashok K; Sheikh-Jabbari, M. M; Wagner, Jenny; Wang, Shao-Jiang; Wiltshire, David L; Yeung, Shek; Yin, Lu; Zhao, Wen (IOP Publishing, 2023-05-04)
    The cosmological principle (CP)—the notion that the Universe is spatially isotropic and homogeneous on large scales—underlies a century of progress in cosmology. It is conventionally formulated through the Friedmann-Lem ...
  • Is the Post-AGB Star SAO 40039 Mildly Hydrogen-Deficient? 
    Sumangala Rao, S; Pandey, G; Lambert, D. L; Giridhar, S (IOP Publishing, 2011-08-10)
    We have conducted an LTE abundance analysis for SAO 40039, a warm post-AGB star whose spectrum is known to show surprisingly strong He I lines for its effective temperature and has been suspected of being H-deficient and ...
  • Is the Quantum Mechanical Description of Physical Reality Complete? Proposed Resolution of the EPR Puzzle 
    Unnikrishnan, C. S (Springer, 2002-02)
    The question whether the quantum mechanical description of physical reality could be considered complete was asked in 1935 by Einstein, Podolsky, and Rosen. Subsequent debates and developments lead to the notion that all ...
  • Is the X-ray pulsar H 0253 + 193 a neutron star spun down in a molecular cloud? 
    Bhatt, H. C (The European Southern Observatory, 1990-06)
    The detection of 206s X-ray pulsations from H0253+193 indicates that the source is a compact object. It is argued here that object can not be a T Tauri star or Be/X –ray binary pulsar suggested that H 0253+193 is slowly ...
  • Is the X-ray pulsar H 0253 + 193 a neutron star spun down in a molecular cloud? 
    Bhatt, H. C (The European Southern Observatory, 1990-06)
    The detection of 206s X-ray pulsations from H0253+193 indicates that the source is a compact object. It is argued here that object can not be a T Tauri star or Be/X –ray binary pulsar suggested that H 0253+193 is slowly ...
  • Is there lower limit to velocity or velocity change? 
    Sreenath, B.N; Arun, K; Sivaram, C (Springer, 2013-05)
    Here we explore the possibility of a lower limit to velocity or velocity change which is 20 orders of magnitude smaller than the speed of light and explore the various observable signatures including those in cosmic rays ...
  • Isodensitometry of Omega Centauri and 47 Tucanae 
    Scaria, K. K (Indian Institute of Astrophysics, Bangalore, 1980)
    We present details of procedure on equidensitometry of globular clusters using the Sabattier technique in photography. Equidensitometry of Omega Centauri and 47 Tuc shows that both clusters become more elliptical beyond r ...
  • ISOGAL: A deep survey of the obscured inner Milky Way with ISO at 7 mu m and 15 mu m and with DENIS in the near-infrared 
    Omont, A; Gilmore, G. F; Alard, C; Aracil, B; August, T; Baliyan, K; Beaulieu, S; Begon, S; Bertou, X; Blommaert, J. A. D. L; Borsenberger, J; Burgdorf, M; Caillaud, B; Cesarsky, C; Chitre, A; Copet, E; de Batz, B; Egan, M. P; Egret, D; Epchtein, N; Felli, M; Fouque, P; Ganesh, S; Genzel, R; Glass, I. S; Gredel, R; Groenewegen, M. A. T; Guglielmo, F; Habing, H. J; Hennebelle, P; Jiang, B; Joshi, U. C; Kimeswenger, S; Messineo, M; Miville-Deschenes, M. A; Moneti, A; Morris, M; Ojha, D. K; Ortiz, R; Ott, S; Parthasarathy, M; Perault, M; Price, S. D; Robin, A. C; Schultheis, M; Schuller, F; Simon, G; Soive, A; Testi, L; Teyssier, D; Tiphene, D; Unavane, M; van Loon, J. T; Wyse, R (EDP Sciences, 2003-06)
    The ISOGAL project is an infrared survey of specific regions sampling the Galactic Plane selected to provide information on Galactic structure, stellar populations, stellar mass-loss and the recent star formation history ...
  • Issues with external occultation of a coronagraph 
    Bayanna, A. R; Mathew, S. K; Sankarasubramanian, K; Venkatakrishnan, P; Singh, J; Prasad, B. R (Springer, 2011-04)
    This paper addresses some of the issues related to externally occulted solar coronagraph; vignetting and achievable resolution due to an external occulter. The analytical expression by Evans (J Opt Soc Am 38:1083–1085, ...
  • An iterative simultaneous solution of the equations of statistical equilibrium and radiative transfer in the comoving frame 
    Peraiah, A (Indian Academy of Sciences, 1980)
  • IUE and ISO observations of the bipolar proto-planetary nebula Hen 401 (IRAS 10178-5958) 
    Parthasarathy, M; García-Lario, P; Gauba, G; de Martino, D; Nakada, Y; Fujii, T; Pottasch, S. R; de Cordoba, L. S. F (EDP Sciences, 2001-09)
    We present ultraviolet (IUE) and infrared (ISO) observations of the bipolar proto-planetary nebula Hen 401 which, combined with previously available optical and near infrared data, are used to reconstruct the overall ...
  • IUE observations of high galactic latitude F supergiants HD 161796 and HD 187885 
    Parthasarathy, M; Pottasch, S. R; Wamsteker, W (European Southern Observatory, 1988-09)
    Low resolution (6 A) IUE ultraviolet spectra of the high galactic latitude F supergiants HD 161796 (F3 Ib) and HD 187885 (F2-3I) are analyzed. The UV spectrum (1250 A to 3250 A) of HD 161796 shows no excess UV flux ...
  • The IUE ultraviolet spectrum of PC 11 
    Parthasarathy, M; Pottasch, S. R; Clavel, J (International Astronomical Union, 1993)

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