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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Goswami, A; Prantzos, N (European Southern Observatory, 2000-07)
    We present a comprehensive study of the evolution of the abundances of intermediate mass elements, from C to Zn, in the Milky Way halo and in the local disk. We use a consistent model to describe the evolution of those two ...
  • Giridhar, S (Centre of Advanced Study in Astronomy Osmania University, 1984)
    The author discusses in this review the implication of observed abundance gradient in the interstellar medium on the chemical evolution of the galaxy. I describe the ingradients that are required to develop enrichment model ...
  • Asplund, M; Gustafsson, B; Kameswara Rao, N; Lambert, D. L (European Southern Observatory, 1998-04)
    The elemental abundances of the mildly hydrogen-deficient R Coronae Borealis (RCrB) star V854Cen have been estimated. The RCrB stars have been divided into majority and minority classes judging by their abundance patterns. ...
  • Pottasch, S. R; Surendiranath, R (EDP Sciences, 2007-01)
    The ISO spectra of the bilobal planetary nebula Hb 5 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition ...
  • Surendiranath, R; Pottasch, S. R; García-Lario, P (EDP Sciences, 2004-07)
    ISO and IUE spectra of the round planetary nebula Me 2-1 are combined with visual spectra taken from the literature to obtain for the first time a complete extinction-corrected spectrum. With this, the physico-chemical ...
  • Pottasch, S. R; Surendiranath, R (EDP Sciences, 2005-12)
    ISO spectra of the bipolar planetary nebula Mz 3 are used to determine the element abundances in the bright lobes of the nebula. The ISO spectra alone are sufficient to determine nitrogen, neon, argon, sulfur and iron ...
  • Pottasch, S. R; Surendiranath, R; Bernard-Salas, J; Roellig, T. L (EDP Sciences, 2009-07)
    The mid-infrared spectrum of the rather circular planetary nebula NGC 2792 taken with the Spitzer Space Telescope is presented. This spectrum is combined with the ultraviolet IUE spectrum and with the spectrum in the ...
  • Surendiranath, R; Pottasch, S. R (EDP Sciences, 2008-05)
    Aims. We determine the chemical abundances and other parameters of the nebula NGC 6826 and its central star. Methods. We present new ISO spectra and combine them with archival IUE and optical spectra from the literature ...
  • Pottasch, S. R; Surendiranath, R (EDP Sciences, 2005-03)
    ISO and IUE spectra of the round-shaped planetary nebula NGC 6886 are combined with spectra in the visual wavelength region taken from the literature to obtain a complete, extinction corrected spectrum from ultraviolet to ...
  • Pottasch, S. R; Surendiranath, R; Bernard-Salas, J (EDP Sciences, 2011-07)
    Context. Models have been made of stars of a given mass that produce planetary nebulae that usually begin on the AGB (although they may begin earlier) and run to the white dwarf stage. While these models cover the so-called ...
  • Giridhar, S (International Astronomical Union, 1987)
  • Meenakshi, P; Goswami, A (Indian Academy of Sciences, 2020-12)
    All the elements heavier than Fe are produced either by the slow (-s) or rapid (-r) neutron-capture process. The neutron density prevailing in the stellar sites is one of the major factors that determines the type of ...
  • Pandey, G; Lambert, D. L; Kameswara Rao, N; Jeffery, C. S (The American Astronomical Society, 2004-02-20)
    Analysis of Hubble Space Telescope Space Telescope Imaging Spectrograph ultraviolet spectra of two hot extreme helium (EHe) stars, V1920 Cyg and HD 124448, provides the first measurements of abundances of neutron-capture ...
  • Castelli, F; Parthasarathy, M; Hack, M (European Southern Observatory, 1997-05)
    High resolution (0.010-0.025nm) IUE ultraviolet spectra of the peculiar Sup/3He star 3 Cen A were analyzed in the whole 120-320nm region. Abundances were derived from the comparison of the observed and computed spectra. ...
  • Gupta, G. R; Banerjee, D; Teriaca, L; Imada, S; Solanki, S (IOP Science, 2010-07-20)
    We present EIS/Hinode and SUMER/SOHO observations of propagating disturbances detected in coronal lines in inter-plume and plume regions of a polar coronal hole. The observation was carried out on 2007 November 13 as part ...
  • Krishan, V (D. Reidel Publishing Co., 1985-10)
    It is proposed that the region containing fast particles, electrostatic and electromagnetic fields, around active galactic nuclei is responsible for generating electromagnetic emissions from γ-rays to radio waves. The ...
  • Kundt, W; Krishan, V (Kluwer Academic Publishers, 1988-04)
    Cometary plasma tails are accelerated by the solar wind to ≈ half its velocity, corresponding to some 10/sup2 times the solar-wind momentum density. The authors corroborate Alfvén's (1957) "wind-sock" mechanism according ...
  • Sivaram, C (International Union of Pure and Applied Physics, 1995)
  • Unnikrishnan, C. S (World Scientific Publishing Company, 2001-03)
    In the weak field limit of Einstein gravity, there are gravitational analogues of the vector potential and the magnetic field. The equivalence principle guides us to a magnetic-like interaction arising from inertial ...
  • Mageshwaran, T; Mangalam, A (International Astronomical Union, 2017-06)
    We have constructed self similar models of time dependent and non relativistic ac- cretion disks in both sub and super-Eddington phase of TDEs with wind outflows for a general viscosity prescription which is a function ...

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