Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral Emulator
In this paper, we developed a spectral emulator based on the Mapping Nearby Galaxies at Apache Point Observatory Stellar Library (MaStar) and a grouping optimization strategy to estimate effective temperature ( T _eff ), surface gravity (log g ), metallicity ([Fe/H]), and the abundance of alpha elem...
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2024-01-01
|
| Series: | The Astrophysical Journal Supplement Series |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4365/ad7505 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850181090571976704 |
|---|---|
| author | Jun-Chao Liang A-Li Luo Yin-Bi Li Xiao-Xiao Ma Shuo Li Shu-Guo Ma Hai-Ling Lu Yun-Jin Zhang Bing Du Xiao Kong |
| author_facet | Jun-Chao Liang A-Li Luo Yin-Bi Li Xiao-Xiao Ma Shuo Li Shu-Guo Ma Hai-Ling Lu Yun-Jin Zhang Bing Du Xiao Kong |
| author_sort | Jun-Chao Liang |
| collection | DOAJ |
| description | In this paper, we developed a spectral emulator based on the Mapping Nearby Galaxies at Apache Point Observatory Stellar Library (MaStar) and a grouping optimization strategy to estimate effective temperature ( T _eff ), surface gravity (log g ), metallicity ([Fe/H]), and the abundance of alpha elements with respect to iron ([ α /Fe]) for O-M-type stars within the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-resolution spectra. The primary aim is to use a rapid spectral-fitting method, specifically the spectral emulator with the grouping optimization strategy, to create a comprehensive catalog for stars of all types within LAMOST, addressing the shortcomings in parameter estimations for both cold and hot stars present in the official LAMOST AFGKM-type catalog. This effort is part of our series of studies dedicated to establishing an empirical spectral library for LAMOST. Experimental results demonstrate that our method is effectively applicable to parameter prediction for LAMOST, with the single-machine processing time within 70 hr. We observed that the internal error dispersions for T _eff , log g , [Fe/H], and [ α /Fe] across different spectral types lie within the ranges of 15–594 K, 0.03–0.27 dex, 0.02–0.10 dex, and 0.01–0.04 dex, respectively, indicating a good consistency. A comparative analysis with external data highlighted deficiencies in the official LAMOST catalog and issues with MaStar parameters, as well as potential limitations of our method in processing spectra with strong emission lines and bad pixels. The derived atmospheric parameters as a part of this work are available via doi:10.12149/101402. |
| format | Article |
| id | doaj-art-cfba5ea7fa704f26a32efb5c8b6bcf8d |
| institution | OA Journals |
| issn | 0067-0049 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Supplement Series |
| spelling | doaj-art-cfba5ea7fa704f26a32efb5c8b6bcf8d2025-08-20T02:17:58ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492024-01-012751810.3847/1538-4365/ad7505Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral EmulatorJun-Chao Liang0https://orcid.org/0009-0001-9085-8718A-Li Luo1https://orcid.org/0000-0001-7865-2648Yin-Bi Li2https://orcid.org/0000-0001-7607-2666Xiao-Xiao Ma3https://orcid.org/0000-0002-9279-2783Shuo Li4https://orcid.org/0000-0002-8913-3605Shu-Guo Ma5https://orcid.org/0000-0001-5066-5682Hai-Ling Lu6https://orcid.org/0000-0002-8252-8743Yun-Jin Zhang7https://orcid.org/0000-0001-7210-0666Bing Du8https://orcid.org/0000-0001-6820-6441Xiao Kong9https://orcid.org/0000-0001-8011-8401CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cnCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cnCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cnCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of China ; lal@nao.cas.cn, ybli@bao.ac.cnIn this paper, we developed a spectral emulator based on the Mapping Nearby Galaxies at Apache Point Observatory Stellar Library (MaStar) and a grouping optimization strategy to estimate effective temperature ( T _eff ), surface gravity (log g ), metallicity ([Fe/H]), and the abundance of alpha elements with respect to iron ([ α /Fe]) for O-M-type stars within the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-resolution spectra. The primary aim is to use a rapid spectral-fitting method, specifically the spectral emulator with the grouping optimization strategy, to create a comprehensive catalog for stars of all types within LAMOST, addressing the shortcomings in parameter estimations for both cold and hot stars present in the official LAMOST AFGKM-type catalog. This effort is part of our series of studies dedicated to establishing an empirical spectral library for LAMOST. Experimental results demonstrate that our method is effectively applicable to parameter prediction for LAMOST, with the single-machine processing time within 70 hr. We observed that the internal error dispersions for T _eff , log g , [Fe/H], and [ α /Fe] across different spectral types lie within the ranges of 15–594 K, 0.03–0.27 dex, 0.02–0.10 dex, and 0.01–0.04 dex, respectively, indicating a good consistency. A comparative analysis with external data highlighted deficiencies in the official LAMOST catalog and issues with MaStar parameters, as well as potential limitations of our method in processing spectra with strong emission lines and bad pixels. The derived atmospheric parameters as a part of this work are available via doi:10.12149/101402.https://doi.org/10.3847/1538-4365/ad7505Astronomy data analysis |
| spellingShingle | Jun-Chao Liang A-Li Luo Yin-Bi Li Xiao-Xiao Ma Shuo Li Shu-Guo Ma Hai-Ling Lu Yun-Jin Zhang Bing Du Xiao Kong Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral Emulator The Astrophysical Journal Supplement Series Astronomy data analysis |
| title | Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral Emulator |
| title_full | Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral Emulator |
| title_fullStr | Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral Emulator |
| title_full_unstemmed | Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral Emulator |
| title_short | Estimating Stellar Atmospheric Parameters and [α/Fe] for LAMOST O-M-type Stars Using a Spectral Emulator |
| title_sort | estimating stellar atmospheric parameters and α fe for lamost o m type stars using a spectral emulator |
| topic | Astronomy data analysis |
| url | https://doi.org/10.3847/1538-4365/ad7505 |
| work_keys_str_mv | AT junchaoliang estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT aliluo estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT yinbili estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT xiaoxiaoma estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT shuoli estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT shuguoma estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT hailinglu estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT yunjinzhang estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT bingdu estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator AT xiaokong estimatingstellaratmosphericparametersandafeforlamostomtypestarsusingaspectralemulator |