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Browsing IIAP Publications by Title

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  • Abundance Analyses of Field RV Tauri Variables. III. DY Aquilae, SS Geminorum, CT Orionis, and CE Virginis 
    Gonzalez, G; Lambert, D. L; Giridhar, S (The American Astronomical Society, 1997-05)
    Analyses of the photospheric compositions of the four field RV Tauri stars, DY Aql, SS Gem, CT Ori, and CE Vir, indicate that to varying degrees they have experienced fractionation processes that have preferentially depleted ...
  • Abundance analyses of Li-enriched and normal giants in the GALAH survey 
    Deepak; Lambert, D. L; Reddy, B. E (Oxford University Press on behalf of the Royal Astronomical Society, 2020-05)
    Compositions of lithium-enriched and normal giants among the GALAH survey are compared. Except for Li, the only detectable abundance difference between lithium-enriched and normal giants among the investigated elements ...
  • Abundance Analyses of the Field RV Tauri Variables: EP Lyrae, DY Orionis, AR Puppis, and R Sagittae 
    Gonzalez, G; Lambert, D. L; Giridhar, S (The American Astronomical Society, 1997-04)
    Analyses of the photospheric compositions of the four field RV Tauri stars, EP Lyr, DY Ori, AR Pup, and R Sge, indicate that to varying degrees they have experienced fractionation processes that have preferentially depleted ...
  • Abundance Analyses of the New R Coronae Borealis Stars ASAS-RCB-8 and ASAS-RCB-10 
    Hema, B. P; Pandey, G; Kamath, D; Kameswara Rao, N; Lambert, D. L; Woolf, V. M (IOP Publishing, 2017-10)
    Abundance analyses of the two newly discovered R Coronae Borealis (RCB) stars ASAS-RCB-8 and ASAS-RCB-10 were conducted using high-resolution optical spectra and model atmospheres. Their chemical compositions place the pair ...
  • Abundance analysis of a CEMP-no star in the Carina dwarf spheroidal galaxy 
    Susmitha Rani, A; Koch, A; Sivarani, T (EDP Sciences, 2017-10)
    Carbon-enhanced metal-poor (CEMP) stars bear important imprints of the early chemical enrichment of any stellar system. While these stars are known to exist in copious amounts in the Milky Way halo, detailed chemical ...
  • Abundance analysis of new r-process-enhanced stars from the HESP–GOMPA survey 
    Bandyopadhyay, A; Sivarani, T; Beers, C. T (IOP Publishing, 2020-08-10)
    We present a study on the detailed chemical abundances of five new relatively bright r-process-enhanced stars that were initially observed as part of the SDSS/MARVELS pre-survey. These stars were selected, on the basis ...
  • Abundance analysis of R CrB variable UW CEN 
    Giridhar, S; Kameswara Rao, N (D. Reidel Publishing Co, 1986)
  • Abundance analysis of s-process enhanced barium stars 
    Mahanta, Upakul; Drisya, K; Goswami, A; Duorah, K (Oxford University Press on behalf of the Royal Astronomical Society, 2016-12-01)
    Detailed chemical composition studies of stars with enhanced abundances of neutron-capture elements can provide observational constraints for neutron-capture nucleosynthesis studies and clues for understanding their ...
  • 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 ...

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