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The r-Process in Metal Poor Stars and Black Hole Formation
Richard Boyd, Michael Famiano, Bradley Meyer +3
Nucleosynthesis of heavy nuclei in metal-poor stars is generally thought to occur via the r-process because the r-process is a primary process that would have operated early in the…
The Chemical Abundances of Stars in the Halo (CASH) Project. II. A Sample of 16 Extremely Metal-poor Stars
Julie K. Hollek, Anna Frebel, Ian U. Roederer +5
We present a comprehensive abundance analysis of 20 elements for 16 new low-metallicity stars from the Chemical Abundances of Stars in the Halo (CASH) project. The abundances have…
Characterizing the Heavy Elements in Globular Cluster M22 and an Empirical s-process Abundance Distribution Derived from the Two Stellar Groups
I. U. Roederer, A. F. Marino, C. Sneden
We present an empirical s-process abundance distribution derived with explicit knowledge of the r-process component in the low-metallicity globular cluster M22. We have obtained hi…
Elemental abundance differences in the 16 Cygni binary system: a signature of gas giant planet formation?
I. Ramirez, J. Melendez, D. Cornejo +2
The atmospheric parameters of the components of the 16Cygni binary system, in which the secondary has a gas giant planet detected, are measured accurately using high quality observ…
r-Process Abundance Signatures in Metal-Poor Halo Stars
John J. Cowan, Ian U. Roederer, Christopher Sneden +1
Abundance observations indicate the presence of rapid-neutron capture (i.e., r-process) elements in old Galactic halo and globular cluster stars. Recent observations of the r-proce…
Primordial r-process Dispersion in Metal-Poor Globular Clusters
Ian U. Roederer
Heavy elements, those produced by neutron-capture reactions, have traditionally shown no star-to-star dispersion in all but a handful of metal-poor globular clusters (GCs). Recent…