A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10
We present a catalog of 8440 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 7000 of these candidates are brighter than G ∼ 16, making them excellent targets for high-...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Supplement Series |
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| Online Access: | https://doi.org/10.3847/1538-4365/ade3ca |
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| author | Xiangyu Li Huiling Chen Yang Huang Huawei Zhang Timothy C. Beers Linxuan Zhu Jifeng Liu |
| author_facet | Xiangyu Li Huiling Chen Yang Huang Huawei Zhang Timothy C. Beers Linxuan Zhu Jifeng Liu |
| author_sort | Xiangyu Li |
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| description | We present a catalog of 8440 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 7000 of these candidates are brighter than G ∼ 16, making them excellent targets for high-resolution spectroscopic follow-up with 4–10 m class telescopes. Unlike most previous studies, we employed an empirical calibration to estimate metallicities from the equivalent widths of the calcium triplet lines, taking advantage of the high signal-to-noise ratio 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. |
| format | Article |
| id | doaj-art-15a327aad5e14efc8a9ae08fcbed47b3 |
| institution | Kabale University |
| issn | 0067-0049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal Supplement Series |
| spelling | doaj-art-15a327aad5e14efc8a9ae08fcbed47b32025-08-20T03:43:58ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127925310.3847/1538-4365/ade3caA Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10Xiangyu Li0Huiling Chen1https://orcid.org/0009-0008-2988-2680Yang Huang2https://orcid.org/0000-0003-3250-2876Huawei Zhang3https://orcid.org/0000-0002-7727-1699Timothy C. Beers4https://orcid.org/0000-0003-4573-6233Linxuan Zhu5Jifeng Liu6National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of China ; zhanghw@pku.edu.cn; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of China ; zhanghw@pku.edu.cn; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of ChinaDepartment of Physics and Astronomy and JINA Center for the Evolution of the Elements (JINA-CEE), University of Notre Dame , Notre Dame, IN 46556, USADepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of China ; zhanghw@pku.edu.cn; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China ; huangyang@ucas.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People’s Republic of ChinaWe present a catalog of 8440 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 7000 of these candidates are brighter than G ∼ 16, making them excellent targets for high-resolution spectroscopic follow-up with 4–10 m class telescopes. Unlike most previous studies, we employed an empirical calibration to estimate metallicities from the equivalent widths of the calcium triplet lines, taking advantage of the high signal-to-noise ratio 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.https://doi.org/10.3847/1538-4365/ade3caChemical abundancesGalaxy stellar contentHalo starsPopulation II stars |
| spellingShingle | Xiangyu Li Huiling Chen Yang Huang Huawei Zhang Timothy C. Beers Linxuan Zhu Jifeng Liu A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10 The Astrophysical Journal Supplement Series Chemical abundances Galaxy stellar content Halo stars Population II stars |
| title | A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10 |
| title_full | A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10 |
| title_fullStr | A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10 |
| title_full_unstemmed | A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10 |
| title_short | A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10 |
| title_sort | metallicity catalog of very metal poor main sequence turn off and red giant stars from lamost dr10 |
| topic | Chemical abundances Galaxy stellar content Halo stars Population II stars |
| url | https://doi.org/10.3847/1538-4365/ade3ca |
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