Tuning the Clock: Uranium and Thorium Chronometers Applied to CS 31082-001

Abstract

We obtain age estimates for the progenitor(s) of the extremely metal-poor ([Fe/H = -2.9) halo star CS 31082-001, based on the recently reported first observation of a Uranium abundance in this (or any other) star. Age estimates are derived by application of the classical r-process model with updated nuclear physics inputs. The [U/Th] ratio yields an age of 13+-4 Gyr or 8+-4 Gyr, based on the use of the ETFSI-Q or the new HFBCS-1 nuclear mass models, respectively. Implications for Thorium chronometers are discussed.

5 pages incl. 1 figure, a shorter 3 page version will be published in the proceedings of the "Astrophysical Ages and Timescales" conference held in Hilo, Hawaii, Feb 5-9, 2001

References in corpus (6)

• The extreme r-element rich, iron-poor halo giant CS31082-001: Implications for the r-process site(s) and radioactive cosmochronology
• Measurement of stellar age from uranium decay
• The Chemical Composition and Age of the Metal-Poor Halo Star BD +17^\circ 3248
• Th Ages for Metal-Poor Stars
• Actinides: How well do we know their stellar production?
• Abundances in the Uranium-Rich Star CS 31082-001

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