Observational nuclear astrophysics: neutron-capture element abundances in old, metal-poor stars

Abstract

The chemical abundances of metal-poor stars provide a great deal of information regarding the individual nucleosynthetic processes that created the observed elements and the overall process of chemical enrichment of the galaxy since the formation of the first stars. Here we review the abundance patterns of the neutron-capture elements (Z > 38) in those metal-poor stars and our current understanding of the conditions and sites of their production at early times. We also review the relative contributions of these different processes to the build-up of these elements within the galaxy over time, and outline outstanding questions and uncertainties that complicate the interpretation of the abundance patterns observed in metal-poor stars. It is anticipated that future observations of large samples of metal-poor stars will help discriminate between different proposed neutron-capture element production sites and better trace the chemical evolution of the galaxy.

21 pages, 7 figures, accepted to Journal of Physics G (to appear in Focus issue "Nucleosynthesis and the role of neutrinos", ed. Baha Balantekin and Cristina Volpe)

References in corpus (25)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
• First Stars VIII -- Enrichment of the neutron-capture elements in the early Galaxy
• Very low metallicity massive star models: Pre-SN evolution and primary nitrogen production
• Discovery of HE 1523-0901, a Strongly r-Process Enhanced Metal-Poor Star with Detected Uranium
• Near-UV Observations of HD221170: New Insights into the Nature of r-Process-Rich Stars
• Neutron-capture elements in the very metal-poor star HD122563
• Production of Light Element Primary Process nuclei in neutrino-driven winds
• The Frequency of Carbon-Enhanced Metal-Poor Stars in the Galaxy from the HERES sample
• The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars
• The stellar content of the Hamburg/ESO survey. IV. Selection of candidate metal-poor stars
• Nucleosynthesis in the Early Galaxy
• Silver and palladium help unveil the nature of a second r-process
• Neutron-capture elements in the very metal-poor star HD88609: another st ar with excesses of light neutron-capture elements
• Stellar Archaeology -- Exploring the Universe with Metal-Poor Stars
• s-Process Nucleosynthesis in Advanced Burning Phases of Massive Stars
• The Most Metal-Poor Stars. III. The Metallicity Distribution Function and CEMP Fraction
• Carbon Stars in the Hamburg/ESO Survey: Abundances
• The s-process in the Galactic halo: the fifth signature of spinstars in the early Universe?
• Nucleosynthesis Modes in the High-Entropy-Wind of Type II Supernovae: Comparison of Calculations with Halo-Star Observations
• Are There Any Stars Lacking Neutron-Capture Elements? Evidence from Strontium and Barium
• Metal-Poor Stars Observed with the Magellan Telescope I. Constraints on Progenitor Mass and Metallicity of AGB Stars Undergoing s-Process Nucleosynthesis
• Carbon and Strontium Abundances of Metal-Poor Stars
• Explaining the Sr and Ba Scatter in Extremely Metal-Poor Stars
• A holistic abundance analysis of r-rich stars

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• From Nuclei to the Cosmos: Tracing Heavy-Element Production with the Oldest Stars
• New limit of ${}^{244}$Pu on Earth points to rarity of actinide nucleosynthesis
• High-Resolution Spectroscopic Study of Extremely Metal-Poor Star Candidates from the SkyMapper Survey
• Hypothesis about Enrichment of Solar System
• "In-System" Fission-Events: An Insight into Puzzles of Exoplanets and Stars?
• Nuclear Physics and Astrophysics of Neutrino Oscillations
• Neutrinos, Rare Isotopes of Exotic Nuclei and Nuclear Astrophysics