Bibcode
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.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 472, Issue 3, p.2963-2974
Fecha de publicación:
12
2017
Número de citas
51
Número de citas referidas
45
Descripción
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 finding stars
with [Fe/H] ≤ -2.5 and 22 per cent for finding stars with [Fe/H] ≤
-3.0. These statistics compare favourably with other surveys that search
for extremely metal-poor stars, namely an improvement by a factor of
∼4 - 5 for recovering stars with [Fe/H] ≤ -3.0. In addition,
Pristine covers a fainter magnitude range than its predecessors and can
thus probe deeper into the Galactic halo.
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