Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: J-PLUS: Searching for very metal-poor star candidates using the SPEEM
  pipeline   We explore the stellar content of the Javalambre Photometric Local Universe
Survey (J-PLUS) Data Release 2 and show its potential to identify
low-metallicity stars using the Stellar Parameters Estimation based on Ensemble
Methods (SPEEM) pipeline. SPEEM is a tool to provide determinations of
atmospheric parameters for stars and separate stellar sources from quasars,
using the unique J-PLUS photometric system. The adoption of adequate selection
criteria allows the identification of metal-poor star candidates suitable for
spectroscopic follow-up. SPEEM consists of a series of machine learning models
which uses a training sample observed by both J-PLUS and the SEGUE
spectroscopic survey. The training sample has temperatures Teff between 4\,800
K and 9\,000 K; $\log g$ between 1.0 and 4.5, and $-3.1<[Fe/H]<+0.5$. The
performance of the pipeline has been tested with a sample of stars observed by
the LAMOST survey within the same parameter range. The average differences
between the parameters of a sample of stars observed with SEGUE and J-PLUS,
which were obtained with the SEGUE Stellar Parameter Pipeline and SPEEM,
respectively, are $\Delta Teff\sim 41$ K, $\Delta \log g\sim 0.11$ dex, and
$\Delta [Fe/H]\sim 0.09$ dex. A sample of 177 stars have been identified as new
candidates with $[Fe/H]<-2.5$ and 11 of them have been observed with the ISIS
spectrograph at the William Herschel Telescope. The spectroscopic analysis
confirms that $64\%$ of stars have $[Fe/H]<-2.5$, including one new star with
$[Fe/H]<-3.0$. SPEEM in combination with the J-PLUS filter system has shown the
potential to estimate the stellar atmospheric parameters (Teff, $\log g$, and
[Fe/H]). The spectroscopic validation of the candidates shows that SPEEM yields
a success rate of $64\%$ on the identification of very metal-poor star
candidates with $[Fe/H]<-2.5$.

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The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin