Skip to content
DraconiticResearch
Search Sources API
197,693 studies31 sourcesUpdated 9 min ago
Peer-reviewedCC BY 4.0The Astrophysical Journal

High-resolution Spectroscopic Follow-up Observation Results for 13 Extremely Metal-poor Candidates Selected by Narrowband Photometry

  • Huiling Chen1
  • Yang Huang2,3
  • Huawei Zhang1
  • Zhen Guo4,5
5 affiliations
  1. 1Peking University
  2. 2University of Chinese Academy of Science
  3. 3Chinese Academy of Sciences
  4. 4Universidad de Valparaíso
  5. 5Chinese Academy of Sciences South America Center for Astronomy (CASSACA)
Open at sourcePDFDOICite

Abstract

Extremely metal-poor (EMP; [Fe/H] < −3.0) stars preserve key information about the earliest stages of Galactic chemical evolution. Based on a training set of spectroscopic metallicities, we constructed catalogs of more than 120,000 EMP candidates from large-scale narrowband photometric surveys. To validate this approach, we obtained high-resolution CFHT/ESPaDOnS spectra for 13 candidates selected from the SkyMapper-based catalog. The follow-up observation confirms that the narrowband photometric selection is effective in identifying very metal-poor (VMP) stars and retaining a substantial EMP fraction: four targets are confirmed as EMP stars, and all targets remain VMP with [Fe/H] < −2.4. The photometric metallicities are systematically lower than the spectroscopic values by 0.44 dex, with a relatively small scatter of 0.19 dex, indicating a systematic offset in the photometric metallicity scale that could be reduced through improved calibration. Abundances for more than 20 chemical species are derived, leading to the identification of a new potassium-enhanced r -II star, J2001-1215. By combining chemical abundances with orbital properties, five stars are found to be dynamically consistent with known Galactic substructures, including Gaia–Sausage–Enceladus (GES), Thamnos, and Sequoia. These stars provide high-resolution chemical measurements for the EMP regime of these Galactic substructures. These results underscore the role of narrowband photometry in efficiently selecting EMP candidates for targeted high-resolution spectroscopic follow-up, thereby enabling detailed chemical and dynamical studies of the early Milky Way.

Related

  1. High Resolution Spectroscopic Follow-up Observation Results for 13 EMP Candidates Selected by Narrow-band Photometry
    Huiling Chen, Yang Huang, Huawei Zhang +1
    arXivPreprintCC BY 4.0Full textGalaxiesSolar & stellar physicsarXiv
  2. CLAS+: A large catalog of Changing-Look AGN candidates selected through S-PLUS narrow-band photometry
    L. Nakazono, L. L. Oliveira, R. R. Valença +11
    arXivPreprintarXiv licenceFull textGalaxiesarXiv
  3. KMOS spectroscopic follow-up of 16 star cluster candidates in the Sagittarius dwarf galaxy
    C.O. Obasi, J. G. Fernández-Trincado, D. Minniti +32
    Astronomy & AstrophysicsPeer-reviewedPublisher termsSolar & stellar physicsCrossref
  4. Spectroscopic Binary Detection as Agent-Callable Tools: Detecting 40,000+ Main-Sequence Binary Candidates from SDSS DR19 APOGEE Spectra
    Serat M. Saad, Yuan-Sen Ting
    arXivPreprintCC BY 4.0Full textInstrumentation & methodsSolar & stellar physicsarXiv
  5. Spectroscopic Binary Detection as Agent-Callable Tools: Detecting 40,000+ Main-Sequence Binary Candidates from SDSS DR19 APOGEE Spectra
    Serat Mahmud Saad, Yuan-Sen Ting
    The Open Journal of AstrophysicsPeer-reviewedCC BY 4.0Solar & stellar physicsCrossref

Cite

BibTeXRIS
BibTeX
@article{chen2026highresolution,
  title = {{High-resolution Spectroscopic Follow-up Observation Results for 13 Extremely Metal-poor Candidates Selected by Narrowband Photometry}},
  author = {Huiling Chen and Yang Huang and Huawei Zhang and Zhen Guo},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aea908},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea908},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - High-resolution Spectroscopic Follow-up Observation Results for 13 Extremely Metal-poor Candidates Selected by Narrowband Photometry
AU  - Huiling Chen
AU  - Yang Huang
AU  - Huawei Zhang
AU  - Zhen Guo
PY  - 2026
DA  - 2026/10/19
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea908
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea908
AB  - Extremely metal-poor (EMP; [Fe/H] < −3.0) stars preserve key information about the earliest stages of Galactic chemical evolution. Based on a training set of spectroscopic metallicities, we constructed catalogs of more than 120,000 EMP candidates from large-scale narrowband photometric surveys. To validate this approach, we obtained high-resolution CFHT/ESPaDOnS spectra for 13 candidates selected from the SkyMapper-based catalog. The follow-up observation confirms that the narrowband photometric selection is effective in identifying very metal-poor (VMP) stars and retaining a substantial EMP fraction: four targets are confirmed as EMP stars, and all targets remain VMP with [Fe/H] < −2.4. The photometric metallicities are systematically lower than the spectroscopic values by 0.44 dex, with a relatively small scatter of 0.19 dex, indicating a systematic offset in the photometric metallicity scale that could be reduced through improved calibration. Abundances for more than 20 chemical species are derived, leading to the identification of a new potassium-enhanced r -II star, J2001-1215. By combining chemical abundances with orbital properties, five stars are found to be dynamically consistent with known Galactic substructures, including Gaia–Sausage–Enceladus (GES), Thamnos, and Sequoia. These stars provide high-resolution chemical measurements for the EMP regime of these Galactic substructures. These results underscore the role of narrowband photometry in efficiently selecting EMP candidates for targeted high-resolution spectroscopic follow-up, thereby enabling detailed chemical and dynamical studies of the early Milky Way.
SN  - 0004-637X
SN  - 1538-4357
ER  -