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Efficiency and success rates of the Pristine survey from spectroscopic follow-up

Published online by Cambridge University Press:  02 August 2018

Kris Youakim Open the ORCID record for Kris Youakim [Opens in a new window] ,
Else Starkenburg ,
David Aguado ,
Nicolas Martin  and
the Pristine collaboration
Kris Youakim
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, Potsdam 14482, Germany
Else Starkenburg
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, Potsdam 14482, Germany
David Aguado
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, 38205 La Laguna, Tenerife, Spain Universidad de La Laguna, Departamento de Astrofísica, 38206 La Laguna, Tenerife, Spain
Nicolas Martin
Affiliation:
Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France email: kyouakim@aip.de
the Pristine collaboration
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, Potsdam 14482, Germany Instituto de Astrofísica de Canarias, Vía Láctea, 38205 La Laguna, Tenerife, Spain Universidad de La Laguna, Departamento de Astrofísica, 38206 La Laguna, Tenerife, Spain Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France email: kyouakim@aip.de
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Abstract

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The Pristine survey uses narrow-band photometry on the region of the Ca II H & K absorption lines to find extremely metal-poor stars. With a spectroscopic follow-up sample of 205 stars in the magnitude range 14 < V < 18, we compute the success rates for finding extremely metal-poor stars and modify the selection criteria used to select stars for follow-up. This reduces the sample to 149 stars, and from these we report success rates of 22% for recovering stars with [Fe/H] < −3.0 and 70% for [Fe/H] < −2.5. When compared to previous works that search for extremely metal-poor stars, the success rates of Pristine show an improvement in efficiency by a factor of ~4 − 5.

Keywords

Galaxy: haloGalaxy: evolutionGalaxy: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 51 - 54
Copyright
Copyright © International Astronomical Union 2018 

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