IIA Institutional Repository

Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

Sort by: Order: Results:

  • Abundance analysis of SDSS J134338.67+484426.6; an extremely metal-poor star from the MARVELS pre-survey 
    Susmitha Rani, A; Sivarani, T; Beers, T. C; Fleming, S; Mahadevan, S; Ge, J (Oxford University Press on behalf of the Royal Astronomical Society, 2016-05)
    We present an elemental-abundance analysis of an extremely metal-poor (EMP; [Fe/H] <−3.0) star, SDSS J134338.67+484426.6, identified during the course of the Multi-object Apache Point Observatory Radial Velocity Exoplanet ...
  • Abundance analysis of selected Cepheids and the galactic distribution of metallicity 
    Giridhar, S (Indian Academy of Sciences, 1983-06)
    The determinations are made in order to study the large-scale chemical inhomogeneities across the galactic disk. High-dispersion spectra are obtained of WZ Sgr, X Sgr, Zeta Gem, T Mon and SV Mon. The atmospheric abundances ...
  • Abundance analysis of the cool extreme helium star LSS3378 
    Pandey, G; Reddy, B. E (Blackwell Publishing, 2006-07)
    Abundance analysis of the cool extreme helium (EHe) star LSS 3378 is presented. The abundance analysis is done using local thermodynamic equilibrium (LTE) line formation and LTE model atmospheres constructed for EHe ...
  • Abundance analysis of the long period southern Cepheid RZ Vel 
    Giridhar, S; Goswami, A; Arellano Ferro, A (Indian Academy of Sciences, 1991-03)
    An abundance analysis is conducted for the long period (P = 20.4 days), young classical Cepheid RZ Vel, a recognized member of an OB association. The results of the analysis are compared with the photometric study by Eggen ...
  • Abundance evolution of intermediate mass elements (C to Zn) in the Milky Way halo and disk 
    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 ...
  • Abundance gradient in interstellar medium 
    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 ...
  • Abundance similarities between the RCrB star V854Cen and the born-again Sakurai's object 
    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. ...
  • Abundances in planetary nebulae: Hb 5 
    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 ...
  • Abundances in planetary nebulae: Me 2-1 
    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 ...
  • Abundances in planetary nebulae: Mz 3 
    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 ...
  • Abundances in planetary nebulae: NGC 2792 
    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 ...
  • Abundances in planetary nebulae: NGC 6826 
    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 ...
  • Abundances in planetary nebulae: NGC 6886 
    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 ...
  • Abundances in planetary nebulae: NGC 1535, NGC 6629, He2-108, and Tc1 
    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 ...
  • Abundances of classical cepheids and evidence for secondary star formation 
    Giridhar, S (International Astronomical Union, 1987)
  • Abundances of neutron-capture elements in CH and carbon-enhanced metal-poor (CEMP) stars 
    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 ...
  • Abundances of Neutron-Capture Elements in the Hot Extreme Helium Stars V1920 Cygni and HD 124448 
    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 ...
  • Abundances of the Sup/3 He star 3 CEN A (B5 IIIp) from ultraviolet IUE spectra 
    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. ...
  • Accelerating waves in polar coronal holes as seen by EIS and SUMER 
    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 ...
  • Acceleration and radiation processes around active galactic nuclei 
    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 ...

Search DSpace


Browse

My Account