J
John J. Cowan
Researcher at University of Oklahoma
Publications - 239
Citations - 17613
John J. Cowan is an academic researcher from University of Oklahoma. The author has contributed to research in topics: Stars & Nucleosynthesis. The author has an hindex of 71, co-authored 235 publications receiving 16491 citations. Previous affiliations of John J. Cowan include University of California, Santa Barbara & National Council for Scientific and Technological Development.
Papers
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Journal ArticleDOI
Neutron-Capture Elements in the Early Galaxy
TL;DR: In this paper, the authors summarize the observed metal-poor star abundances, contrasting them with the Solar-system values, comparing them to theoretical predictions, and using them to assess the types of stars responsible for their specific anomalies, and speculating on the timing and nature of early Galactic nucleosynthesis.
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GALACTIC EVOLUTION OF Sr, Y, AND Zr: A MULTIPLICITY OF NUCLEOSYNTHETIC PROCESSES
Claudia Travaglio,Roberto Gallino,Enrico Arnone,Enrico Arnone,John J. Cowan,Faith Jordan,Christopher Sneden +6 more
TL;DR: In this article, a detailed analysis of a large published database of spectroscopic observations of Sr, Y, Zr, Ba, and Eu for Galactic stars at various metallicities, showing that the observed trends versus metallicity can be understood in light of a multiplicity of stellar neutron-capture components.
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Galactic Evolution of Sr, Y, Zr: A Multiplicity of Nucleosynthetic Processes
Claudia Travaglio,Roberto Gallino,Enrico Arnone,John J. Cowan,Faith Jordan,Christopher Sneden +5 more
TL;DR: In this article, a detailed analysis of a large database of spectroscopic observations of Sr,Y,Zr, Ba, and Eu for Galactic stars at various metallicities is presented.
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Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-poor Giants
Debra L. Burris,Catherine A. Pilachowski,Taft E. Armandroff,Christopher Sneden,John J. Cowan,Henry G. Roe +5 more
TL;DR: In this article, a large sample of metal-poor giants from the Bond survey is presented, and the abundances of eight n-capture elements (Sr, Y, Zr, Ba, La, Nd, Eu, and Dy) in 43 stars have been derived from blue and red spectra.
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The Extremely Metal-poor, Neutron Capture-rich Star CS 22892-052: A Comprehensive Abundance Analysis
Christopher Sneden,John J. Cowan,John J. Cowan,James E. Lawler,Inese I. Ivans,Inese I. Ivans,Scott Burles,Timothy C. Beers,Francesca Primas,Vanessa Hill,James W. Truran,George M. Fuller,B. Pfeiffer,Karl-Ludwig Kratz +13 more
TL;DR: In this paper, high-resolution spectra obtained with three ground-based facilities and the Hubble Space Telescope (HST) have been combined to produce a new abundance analysis of CS 22892-052, an extremely metal-poor giant with large relative enhancements of neutron capture elements.