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Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-poor Giants
- D. Burris, C. Pilachowski, T. Armandroff, C. Sneden, J. Cowan, H. Roe
- Physics
- 8 May 2000
New abundances for neutron-capture (n-capture) elements in a large sample of metal-poor giants from the Bond survey are presented. The spectra were acquired with the KPNO 4 m echelle and coudé feed…
Neutron-Capture Elements in the Early Galaxy
- C. Sneden, J. Cowan, R. Gallino
- Physics
- 15 August 2008
The content of neutron-capture (trans-iron-peak) elements in the lowmetallicity Galactic halo varies widely from star to star. The differences are both in bulk amount of the neutron-capture elements…
The Rise of the s-Process in the Galaxy
- J. Simmerer, C. Sneden, J. Cowan, Jason Collier, V. Woolf, J. Lawler
- Physics
- 15 October 2004
From newly obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3 < [Fe/H] < +0.3 in 159…
The Ultra--Metal-poor, Neutron-Capture--rich Giant Star CS 22892-052
- C. Sneden, A. McWilliam, G. Preston, J. Cowan, D. Burris, B. J. Armosky
- Physics
- 1 August 1996
The Extremely Metal-poor, Neutron Capture-rich Star CS 22892-052: A Comprehensive Abundance Analysis
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…
Galactic Evolution of Sr, Y, and Zr: A Multiplicity of Nucleosynthetic Processes
- C. Travaglio, R. Gallino, E. Arnone, J. Cowan, F. Jordan, C. Sneden
- Physics
- 7 October 2003
In this paper we follow the Galactic enrichment of three easily observed light n-capture elements: Sr, Y, and Zr. Input stellar yields have been first separated into their respective main and weak…
The r-Process-enriched Low-Metallicity Giant HD 115444
- Jenny Westin, C. Sneden, B. Gustafsson, J. Cowan
- Physics, Geology
- 20 October 1999
New high-resolution, very high signal-to-noise spectra of ultra-metal-poor (UMP) giant stars HD 115444 and HD 122563 have been gathered with the High-Resolution Echelle Spectrometer of the McDonald…
The Chemical Composition and Age of the Metal-poor Halo Star BD +17°3248
We have combined new high-resolution spectra obtained with the Hubble Space Telescope (HST) and ground-based facilities to make a comprehensive new abundance analysis of the metal-poor, halo star BD…
r-Process Abundances and Chronometers in Metal-poor Stars
- J. Cowan, B. Pfeiffer, T. Beers
- PhysicsThe Astrophysical Journal
- 24 August 1998
Rapid neutron-capture (i.e., r-process) nucleosynthesis calculations, employing internally consistent and physically realistic nuclear physics input (quasi-particle random-phase approximation [QRPA]…
THE ABUNDANCES OF NEUTRON-CAPTURE SPECIES IN THE VERY METAL-POOR GLOBULAR CLUSTER M15: A UNIFORM ANALYSIS OF RED GIANT BRANCH AND RED HORIZONTAL BRANCH STARS
- J. Sobeck, R. P. Kraft, G. Burley
- Physics
- 5 March 2011
The globular cluster M15 is unique in its display of star-to-star variations in the neutron-capture elements. Comprehensive abundance surveys have been previously conducted for handfuls of M15 red…
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