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Constraints on the Nature of the s- and r-processes

Published online by Cambridge University Press:  09 March 2010

Christopher Sneden ,
John J. Cowan  and
Roberto Gallino
Christopher Sneden
Affiliation:
Dept. of Astronomy, The University of Texas, Austin, TX 78712 email: [email protected]
John J. Cowan
Affiliation:
Homer L. Dodge Dept. of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 email: [email protected]
Roberto Gallino
Affiliation:
Dipartimento di Fisica Generale, Universita' di Torino, 10125 Torino, Italy email: [email protected]
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Abstract

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Neutron-capture (Z > 30) elements are detected in many very metal-poor halo stars, and so they must have been manufactured by some of the earliest element donors in our Galaxy's history. The bulk amounts of neutron-capture elements with respect to the iron group vary by several orders of magnitude from star to star at low metallicities. Additionally, abundance distributions among these elements are often strikingly different from that of the solar system. Some stars exhibit abundances that must have been made purely in “rapid” neutron-capture events (the r-process), some in “slow” events (the s-process), and some have hybrid mixes. Here we summarize the major observed categories of the neutron-capture abundances in metal-poor stars, and discuss their implications for early Galactic nucleosynthesis.

Keywords

nuclear reactionsnucleosynthesisabundancesstars: Population II
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 46 - 53
Copyright
Copyright © International Astronomical Union 2010

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