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Browsing by Author "Goswami, A"

Browsing by Author "Goswami, A"

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  • Automated classification and stellar parameterization 
    Giridhar, S; Muneer, S; Goswami, A (Memorie della Societa Astronomica Italiana, 2006)
    Different approaches for automated spectral classification are critically reviewed. We describe in detail ANN based methods which are very efficient in quick handling of the large volumes of data generated by different ...
  • The CH fraction of carbon stars at high galactic latitudes 
    Goswami, A; Drisya, K; Shantikumar, N. S (Blackwell Publishing, 2010-02)
    CH stars form a distinct class of objects with characteristic properties like iron deficiency, enrichment of carbon and overabundance of heavy elements. These properties can provide strong observational constraints for the ...
  • CH stars at high Galactic latitudes 
    Goswami, A (Blackwell Publishing, 2005-05)
    Carbon-rich stars of Population II, such as CH stars, can provide direct information on the role of low- to intermediate-mass stars of the halo in early Galactic evolution. Thus accurate knowledge of the CH stellar population ...
  • Characterizing the companion AGBs using surface chemical composition of barium stars 
    Shejeelammal, J; Goswami, A; Goswami, P. P; Rathour, R. S; Masseron, T (Oxford University Press on behalf of the Royal Astronomical Society, 2020-10)
    Barium stars are one of the important probes to understand the o rigin and evolution of slow neutron-capture process elements in the Galaxy. These are e xtrinsic stars, where the observed s-process element abundances ...
  • Chemical analysis of a carbon-enhanced very metal-poor star: CD-27 14351 
    Drisya, K; Goswami, A; Masseron, T (IOP Publishing, 2017-01-01)
    We present, for the first time, an abundance analysis of a very metal-poor carbon-enhanced star CD-27 14351 based on a high-resolution (R ~ 48,000) FEROS spectrum. Our abundance analysis performed using local thermodynamic ...
  • Chemical analysis of CH stars – I. Atmospheric parameters and elemental abundances 
    Drisya, K; Goswami, A (Oxford University Press on behalf of the Royal Astronomical Society, 2014-05-11)
    Results from high-resolution spectral analyses of a selected sample of CH stars are presented. Detailed chemical composition studies of these objects, which could reveal abundance patterns that in turn provide information ...
  • Chemical analysis of CH stars – II. Atmospheric parameters and elemental abundances 
    Drisya, K; Goswami, A (Oxford University Press on behalf of the Royal Astronomical Society, 2015-01-21)
    We present detailed chemical analyses for a sample of 12 stars selected from the CH star catalogue of Bartkevicius. The sample includes two confirmed binaries, four objects that are known to show radial velocity variations ...
  • Chemical analysis of CH stars – III. Atmospheric parameters and elemental abundances 
    Meenakshi, P; Goswami, A; Goswami, P. P; Shejeelammal, J; Masseron, T (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    Elemental abundances of CH stars can provide observational constraints for theoretical studies on the nucleosynthesis and evolution of low- and intermediate-mass stars. However, available abundance data in literature are ...
  • Chemical analysis of three barium stars: HD 51959, HD 88035, HD 121447 
    Drisya, K; Goswami, A; Sridhar, N; Masseron, T; Meenakshi, P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-05)
    We present elemental abundance results from high-resolution spectral analysis of three nitrogen-enhanced barium stars. The analysis is based on spectra obtained with the fibre- fed extended range optical spectrograph ...
  • Chemical Analysis of Two Extremely Metal-poor Stars HE 2148-2039 and HE 2155-2043 
    Meenakshi, P; Goswami, A (IOP Publishing, 2021-05-01)
    We present elemental abundance results for HE 2148−2039 and HE 2155−2043 based on a detailed high-resolution spectroscopic analysis. The high-resolution Subaru/High Dispersion Spectrograph (HDS) spectra used for our analysis ...
  • The chemical composition and circumstellar environment of the variable star QY sge 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of the Pacific, 2004)
    Chemical composition studies of the variable star QY Sge show abundance anomalies suggestive of the pattern exhibited by the warmer RV Tau variables. Abundance analysis indicates a near-solar atmosphere with highly condensable ...
  • Chemical evolution of intermediate mass nuclei in the solar neighbourhood and the halo of the galaxy 
    Goswami, A; Prantzos, N (Astronomical Society of India, 2000)
    Recent observations of Fe group elements in very low metallicity stars show an evolutionary trend very different from that of Fe, implying divergent paths of chemical evolution for these elements. In the present work we ...
  • Chemical evolution of the Milky Way halo and disk 
    Prantzos, N; Goswami, A (Elsevier, 2001-05)
  • Chemodynamical study of two CEMP-no stars from the Hamburg/ESO Survey 
    Shejeelammal, J; Goswami, A (Oxford University Press on behalf of Royal Astronomical Society, 2024-01)
    The Carbon-Enhanced Metal-Poor (CEMP) stars with no enhancement of neutron-capture elements, the so-called CEMP-no stars are believed to be the direct descendants of first-generation stars and provide a unique opportunity ...
  • Classification and characterization using HCT/HFOSC spectra of carbon stars selected from the HES survey 
    Meenakshi, P; Goswami, A (Springer, 2024-01)
    We present results from the analysis of 88 carbon stars selected from Hamburg/ESO (HES) survey using low-resolution spectra (R ∼1330 & 2190). The spectra were obtained with the Himalayan Faint Object Spectrograph Camera ...
  • Comparative modelling of the spectra of cool giants 
    Lebzelter, T; Heiter, U; Abia, C; Eriksson, K; Ireland, M; Neilson, H; Nowotny, W; Maldonado, J; Merle, T; Peterson, R; Plez, B; Short, C. I; Wahlgren, G. M; Worley, C; Aringer, B; Bladh, S; de Laverny, P; Goswami, A; Mora, A; Norris, R. P; Recio-Blanco, A; Scholz, M; Thevenin, F; Tsuji, T; Kordopatis, G; Montesinos, B; Wing, R. F (EDP Sciences, 2012-11)
    Context. Our ability to extract information from the spectra of stars depends on reliable models of stellar atmospheres and appropriate techniques for spectral synthesis. Various model codes and strategies for the analysis ...
  • Constraints of the Physics of Low-Mass AGB Stars from CH and CEMP Stars 
    Cristallo, S; Karinkuzhi, D; Goswami, A; Piersanti, L; Gobrecht, D (IOP Publishing, 2016-12-20)
    We analyze a set of published elemental abundances from a sample of CH stars which are based on high resolution spectral analysis of ELODIE and SUBARU/HDS spectra. All the elemental abundances were derived from local ...
  • Contribution of HdC Stars to the Galactic Enrichment: The Sr-rich HdC Star HE 1015-2050 
    Goswami, A; Aoki, W (Astronomical Society of the Pacific, 2012-08)
    A fraction of the rare class of Hydrogen-deficient carbon (HdC) stars in our Galaxy are known to exhibit strong features of light neutron-capture elements such as Sr, Y and Zr usually attributed to the weak component of ...
  • Contribution of Proton Capture Reactions to the Ascertained Abundance of Fluorine in the Evolved Stars of Globular Cluster M4, M22, 47 Tuc and NGC 6397 
    Mahanta, Upakul; Goswami, A; Duorah, H. L; Duorah, K (Indian Academy of Sciences, 2017-12)
    The origin of the abundance pattern and also the (anti)correlation present among the elements found in stars of globular clusters (GCs) remains unimproved until date. The proton-capture reactions are presently recognised ...
  • Cosmochemistry: A Perspective 
    Goswami, A (Springer, 2010)
    Cosmochemistry can be said to aim at constructing a quantitative and continuous history of chemical evolution of our universe starting from appearance of hydrogenic matter immediately after the Big Bang. While the main ...

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