Nucleosynthetic signatures of the first stars

Anna Frebel (), Wako Aoki, Norbert Christlieb, Hiroyasu Ando, Martin Asplund, Paul S. Barklem, Timothy C. Beers, Kjell Eriksson, Cora Fechner, Masayuki Y. Fujimoto, Satoshi Honda, Toshitaka Kajino, Takeo Minezaki, Ken'ichi Nomoto, John E. Norris, Sean G. Ryan, Masahide Takada-Hidai, Stelios Tsangarides and Yuzuru Yoshii
Additional contact information
Anna Frebel: The Australian National University
Wako Aoki: National Astronomical Observatory of Japan
Norbert Christlieb: National Astronomical Observatory of Japan
Hiroyasu Ando: National Astronomical Observatory of Japan
Martin Asplund: The Australian National University
Paul S. Barklem: Uppsala Astronomical Observatory
Timothy C. Beers: Michigan State University
Kjell Eriksson: Uppsala Astronomical Observatory
Cora Fechner: Hamburger Sternwarte
Masayuki Y. Fujimoto: Hokkaido University
Satoshi Honda: National Astronomical Observatory of Japan
Toshitaka Kajino: National Astronomical Observatory of Japan
Takeo Minezaki: University of Tokyo
Ken'ichi Nomoto: University of Tokyo
John E. Norris: The Australian National University
Sean G. Ryan: Open University
Masahide Takada-Hidai: Tokai University
Stelios Tsangarides: Open University
Yuzuru Yoshii: University of Tokyo

Nature, 2005, vol. 434, issue 7035, 871-873

Abstract: Low-metal stars: second site When HE010715240 was discovered in 2002 it was the most metal-deficient star known. (Astrophysicists use the term ‘metal’ for all elements bar hydrogen and helium.) It had an iron abundance 20 times lower than previously recorded, suggesting that here was a relic, a star formed soon after the Big Bang. Now a second ‘unevolved’ star has been discovered: HE132712326, with an iron abundance about half that of HE010715240. One low-metal star was a novelty; two is a new class of stellar object. The similarities (in C and N content) and contrasts (in Li and Sr) between these two stellar relics present challenges to theories of star formation and may lead to new discoveries about how the elements were synthesized in the first stars.

Date: 2005
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DOI: 10.1038/nature03455

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