Samenvatting
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.
| Originele taal-2 | English |
|---|---|
| Pagina's (van-tot) | 2963-2974 |
| Aantal pagina's | 12 |
| Tijdschrift | Monthly Notices of the Royal Astronomical Society |
| Volume | 472 |
| Nummer van het tijdschrift | 3 |
| DOI's | |
| Status | Published - 1-dec.-2017 |