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Lifting the Veil on Ultra Metal-Poor Stars in the Outermost Halo

Published online by Cambridge University Press:  02 August 2018

Jinmi Yoon Open the ORCID record for Jinmi Yoon [Opens in a new window] ,
Devin D. Whitten ,
Timothy C. Beers ,
Vinicius M. Placco ,
Young Sun Lee ,
Sarah Dietz ,
Dmitrii Gudin  and
Kaitlin C. Rasmussen
Jinmi Yoon
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN, USA email: [email protected] JINA Center for the Evolution of the Elements, Notre Dame, IN, USA
Devin D. Whitten
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN, USA email: [email protected] JINA Center for the Evolution of the Elements, Notre Dame, IN, USA
Timothy C. Beers
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN, USA email: [email protected] JINA Center for the Evolution of the Elements, Notre Dame, IN, USA
Vinicius M. Placco
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN, USA email: [email protected] JINA Center for the Evolution of the Elements, Notre Dame, IN, USA
Young Sun Lee
Affiliation:
Department of Astronomy & Space Science, Chungnam National Univ., Daejeon, South Korea
Sarah Dietz
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN, USA email: [email protected] JINA Center for the Evolution of the Elements, Notre Dame, IN, USA
Dmitrii Gudin
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN, USA email: [email protected] JINA Center for the Evolution of the Elements, Notre Dame, IN, USA
Kaitlin C. Rasmussen
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, IN, USA email: [email protected] JINA Center for the Evolution of the Elements, Notre Dame, IN, USA
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Abstract

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The study of extremely metal-poor (EMP; [Fe/H] <−3.0) and ultra metal-poor (UMP; [Fe/H] <−4.0) stars is crucial for better understanding first-star nucleosynthesis and constraining the initial mass function in the early Universe. However, UMP stars discovered in the past 25 years only number ~25. A few recent theoretical studies have pointed out that there is likely to exist large numbers of EMP and UMP stars in the periphery of the Galactic halo, at distances exceeding 30-50 kpc. We present identifications of several new EMP/UMP stars and introduce a survey to expedite discovering hundreds to thousands of EMP/UMP stars in the outermost halo (as well as in the local volume) over the next few years, which could revolutionize chemical-evolution studies of the Galaxy.

Keywords

General: nucleosynthesisMethod: data analysisGalaxy: halostars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 389 - 390
Copyright
Copyright © International Astronomical Union 2018 

References

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