The Pristine survey - III. Spectroscopic confirmation of an efficient search for extremely metal-poor stars
- Youakim, K.
- Starkenburg, E.
- Aguado, D. S.
- Martin, N. F.
- Fouesneau, M.
- González Hernández, J. I.
- Allende Prieto, C.
- Bonifacio, P.
- Gentile, M.
- Kielty, C.
- Côté, P.
- Jablonka, P.
- McConnachie, A.
- Sánchez Janssen, R.
- Tolstoy, E.
- Venn, K.
DOIAbstract
The Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the Ca II H&K absorption lines, designed to efficiently search for extremely metal-poor stars. In this work, we use the first results of a medium-resolution spectroscopic follow-up to refine the selection criteria for finding extremely metal-poor stars ([Fe/H] ≤ -3.0) in the Pristine survey. We consider methods by which stars can be selected from available broad-band and infrared photometry plus the additional Pristine narrow-band photometry. The sample consists of 205 stars in the magnitude range 14 <V <18. Applying the photometric selection criteria cuts the sample down to 149 stars, and from these we report a success rate of 70 per cent for f...
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