Detection of the Second r-process Peak Element Tellurium in Metal-Poor Stars

Details Detection of the Second r-process Peak Element Tellurium in Metal-Poor Stars Detection of the Second r-process Peak Element Tellurium in Metal-Poor Stars

2012-02-10

arxiv.org/abs/1202.2378v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in the Astrophysical Journal Letters (5 pages, 2 figures)

Scientific paper

Using near-ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope, we detect neutral tellurium in three metal-poor stars enriched by products of r-process nucleosynthesis, BD+17 3248, HD 108317, and HD 128279. Tellurium (Te, Z=52) is found at the second r-process peak (A=130) associated with the N=82 neutron shell closure, and it has not been detected previously in Galactic halo stars. The derived tellurium abundances match the scaled solar system r-process distribution within the uncertainties, confirming the predicted second peak r-process residuals. These results suggest that tellurium is predominantly produced in the main component of the r-process, along with the rare earth elements.

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