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New Highly r-Process-Enhanced Halo Stars

Published online by Cambridge University Press:  02 August 2018

Timothy C. Beers ,
Erika M. Holmbeck ,
Vinicius M. Placco ,
Terese T. Hansen ,
Joshua D. Simon ,
Ian Thompson ,
Anna Frebel  and
Charli M. Sakari
Timothy C. Beers
Affiliation:
University of Notre Dame, Notre Dame, IN, USA, email: [email protected] JINA-CEE, Notre Dame, IN, USA
Erika M. Holmbeck
Affiliation:
University of Notre Dame, Notre Dame, IN, USA, email: [email protected] JINA-CEE, Notre Dame, IN, USA
Vinicius M. Placco
Affiliation:
University of Notre Dame, Notre Dame, IN, USA, email: [email protected] JINA-CEE, Notre Dame, IN, USA
Terese T. Hansen
Affiliation:
Carnegie Observatories, Pasadena, CA, USA
Joshua D. Simon
Affiliation:
Carnegie Observatories, Pasadena, CA, USA
Ian Thompson
Affiliation:
Carnegie Observatories, Pasadena, CA, USA
Anna Frebel
Affiliation:
MIT, Cambridge, MA, USA
Charli M. Sakari
Affiliation:
University of Washington, WA, USA
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Abstract

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There are roughly 25 very metal-poor (VMP; [Fe/H] < -2.0), highly r-process-enhanced (‘r-II’; [Eu/Fe] > + 1.0) stars currently known, discovered over the past 20+ years. These stars provide nearly pure signatures of r-process events early in the Galactic history. We are conducting a high-resolution follow-up survey of RAVE and other bright targets to identify a total of > 100 r-II stars. Our pilot runs on the du Pont 2.5-m at Las Campanas Observatory and the ARC 3.5-m at Apache Point Observatory have already identified up to fourteen new r-II stars. We are continuing our high-resolution follow-up efforts to constrain the astrophysical site(s) and nature of the r-process.

Keywords

General: nucleosynthesisGalaxy: halostars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 277 - 278
Copyright
Copyright © International Astronomical Union 2018 

References

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