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Browsing by Author "Goswami, A"

Browsing by Author "Goswami, A"

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  • 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 ...
  • DZ Andromedae : A search for the spectral evidence of its possible RCB nature 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of India, 1999)
    The analysis of high-resolution spectra of DZ Andromedae, a suspected R Coronae Borealis variable, is presented here. The spectra of DZ And show the characteristics of a normal K2 III star, indicating that the star was ...
  • Elemental abundances in CEMP stars: r– and s–process elements 
    Goswami, A; Athiray, S. P; Drisya, K (Springer, 2010)
    A number of Carbon-Enhanced Metal-poor (CEMP) stars are known to exhibit enhancement of both r – and s – process elements. An understanding of the relative contributions from r – and s – process would provide insight into ...
  • Emission-line spectra of XX Ophiuchi in 1996 and 1997 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (The Observatory, 2001-04)
  • Evidence of V-band polarimetric separation of carbon stars at high galactic latitude 
    Goswami, A; Sreeja, S. K; Sen, A. K (IOP Publishing, 2010-10-10)
    Polarization is an important indicator of stellar evolution, especially for stars evolving from red giant stage to planetary nebulae. However, not much is known about the polarimetric properties of the carbon-enhanced ...
  • Fundamental parameters of barium and CH stars from asteroseismic analysis: HD 33409, HD 20084 and HD 66812 
    Sonamben, Mayani; Goswami, A (Indian Academy of Sciences, 2022-12)
    Asteroseismic analysis of stars using space mission data, such as the transiting exoplanet survey satellite (TESS) allows us to derive accurate fundamental parameters of stars. Barium and CH stars are believed to be in ...
  • HCT/HESP study of two carbon stars from the LAMOST survey 
    Shejeelammal, J; Goswami, A; Shi, Jianrong (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    Carbon stars, enhanced in carbon and neutron-capture elements, provide a wealth of information about the nucleosynthesis history of the Galaxy. In this work, we present the first ever detailed abundance analysis of the ...
  • HD209621: abundances of neutron-capture elements 
    Goswami, A; Aoki, W (Blackwell Publishing, 2010-05)
    High-resolution spectra obtained from the Subaru Telescope High Dispersion Spectrograph have been used to update the stellar atmospheric parameters and metallicity of the star HD 209621. We have derived a metallicity of ...
  • HE 1015–2050: discovery of a hydrogen-deficient carbon star at high galactic latitude 
    Goswami, A; Drisya, K; Shantikumar, N. S (IOP Publishing, 2010-11-10)
    Medium-resolution spectral analysis of candidate Faint High Latitude Carbon (FHLC) stars from the Hamburg/ESO survey has given us the potential to discover objects of rare types. Two primary spectral characteristics of R ...
  • A high resolution spectroscopic study of XX Ophiuchi 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of India, 2001)
    The star XX Oph has been known to exhibit peculiar spectral variabilities since the work of Merrill in 1924. A high resolution spectroscopic study of the XX Oph spectra taken in July 1996 and later in June 1997 also exhibit ...
  • High Resolution Spectroscopy of QY Sge 
    Kameswara Rao, N; Goswami, A; Lambert, D. L (Astronomical Society of India, 2002-09)
    High resolution spectral analysis of QY Sge, a post AGB star is presented here. The spectrum of QY Sge is characterized by three major components: absorption lines representative of a G supergiant, sharp emission lines ...
  • A high-resolution spectral analysis of three carbon-enhanced metal-poor stars 
    Goswami, A; Aoki, W; Beers, T. C; Christlieb, N; Norris, J. E; Ryan, S. G; Tsangarides, S (Blackwell Publishing, 2006-09)
    We present results of an analysis of high-resolution spectra obtained with the Subaru Telescope High Dispersion Spectrograph, of two Carbon-Enhanced Metal-Poor stars, HE 1305+0007 and HE 1152-0355, and of the classical CH ...
  • A high-resolution spectroscopic analysis of the suspected spectroscopic binary HD 165553 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (The Observatory, 2004-02)
    The results of an analysis of a high-resolution spectrum of the possible spectroscopic binary HD 165553, obtained with a spectral resolving power of ~ 60 000, are presented. A detailed chemical-composition study indicates ...
  • High-resolution spectroscopy of QY Sge: an obscured RV Tauri variable? 
    Kameswara Rao, N; Goswami, A; Lambert, D. L (Blackwell Publising Ltd, 2002-07)
    The first high-resolution optical spectra of QY Sge are presented and discussed. Menzies & Whitelock, on the basis of photometry and low-resolution spectra, suggested that this G0I supergiant was obscured by dust and seen ...
  • Hydrogen-deficient nature of Z UMi 
    Goswami, A; Kameswara Rao, N; Gonzalez, G; Lambert, D. L (Astronomical Society of the Pacific, 1996)
  • i-Process nucleosynthesis: Observational evidences from CEMP stars 
    Goswami, P. P; Goswami, A (Indian Academy of Sciences, 2020-12)
    The surface chemical compositions of a large fraction of carbon-enhanced metal-poor (CEMP) stars, the so-called CEMP-r/s stars, are known to exhibit enhancement of both s-process and r-process elements. For these stars, ...

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