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The new record holder for the most iron-poor star: HE 1327–2326, a dwarf or subgiant with [Fe/H[=−5.4

Published online by Cambridge University Press:  23 December 2005

A. Frebel ,
W. Aoki ,
N. Christlieb ,
H. Ando ,
M. Asplund ,
P. S. Barklem ,
T. C. Beers ,
K. Eriksson ,
C. Fechner  and
M. Y. Fujimoto
...Show all authors
A. Frebel
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Australia email: anna@mso.anu.edu.au
W. Aoki
Affiliation:
National Astronomical Observatory of Japan, Japan
N. Christlieb
Affiliation:
Hamburger Sternwarte, Germany
H. Ando
Affiliation:
National Astronomical Observatory of Japan, Japan
M. Asplund
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Australia email: anna@mso.anu.edu.au
P. S. Barklem
Affiliation:
Department of Physics & Space Sciences, Uppsala Astronomical Observatory, Sweden
T. C. Beers
Affiliation:
Department of Physics & Astronomy, and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, USA
K. Eriksson
Affiliation:
Department of Physics & Space Sciences, Uppsala Astronomical Observatory, Sweden
C. Fechner
Affiliation:
Hamburger Sternwarte, Germany
M. Y. Fujimoto
Affiliation:
Department of Physics, Hokkaido University, Japan
S. Honda
Affiliation:
National Astronomical Observatory of Japan, Japan
T. Kajino
Affiliation:
National Astronomical Observatory of Japan, Japan
T. Minezaki
Affiliation:
Institute of Astronomy, School of Science, University of Tokyo, Japan
K. Nomoto
Affiliation:
Department of Astronomy, School of Science, University of Tokyo, Japan
J. E. Norris
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Australia email: anna@mso.anu.edu.au
S. G. Ryan
Affiliation:
Department of Physics and Astronomy, Open University, UK
M. Takada-Hidai
Affiliation:
Liberal Arts Education Center, Tokai University, Japan
S. Tsangarides
Affiliation:
Department of Physics and Astronomy, Open University, UK
Y. Yoshii
Affiliation:
Institute of Astronomy, School of Science, University of Tokyo, Japan
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Abstract

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We describe the discovery of HE 1327–2326, a dwarf or subgiant with $\mbox{[Fe/H]}=-5.4$. The star was found in a sample of bright metal-poor stars selected from the Hamburg/ESO survey. Its abundance pattern is characterized by very high C and N abundances. The detection of Sr which is overabundant by a factor of 10 as compared to iron and the Sun, suggests that neutron-capture elements had already been produced in the very early Galaxy. A puzzling Li depletion is observed in this unevolved star which contradicts the value of the primordial Li derived from WMAP and other Li studies. Possible scenarios for the origin of the abundance pattern (Pop. II or Pop. III) are presented as well as an outlook on future observations.

Keywords

Stars: individual (HE 1327–2326)stars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 207 - 212
Copyright
© 2005 International Astronomical Union