Kavli Affiliate: Huawei Zhang
| First 5 Authors: Xiangyu Li, Huiling Chen, Yang Huang, Huawei Zhang, Timothy C. Beers
| Summary:
We present a catalog of 8,440 candidate very metal-poor (VMP; [Fe/H] < -2.0)
main-sequence turn-off (MSTO) and red giant stars in the Milky Way, identified
from low-resolution spectra in LAMOST DR10. More than 7,000 of these candidates
are brighter than G ~ 16, making them excellent targets for high-resolution
spectroscopic follow-up with 4-10 meter-class telescopes. Unlike most previous
studies, we employed an empirical calibration to estimate metallicities from
the equivalent widths (EWs) of the Calcium Triplet (CaT) lines, taking
advantage of the high signal-to-noise ratio (SNR) in the red arm of LAMOST
spectra. We further refined this calibration to improve its reliability for
more distant stars. This method enables robust identification of VMP candidates
with metallicities as low as [Fe/H] = -4.0 among both MSTO and red giant stars.
Comparisons with metal-poor samples from other spectroscopic surveys and
high-resolution follow-up observations confirm the accuracy of our estimates,
showing a typical median offset of ~0.1 dex and a standard deviation of ~0.2
dex.
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