Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST Survey
Mass ( M ) and luminosity ( L ) are fundamental parameters of stars but can only be measured indirectly. Typically, effective temperature ( T _eff ), surface gravity ( $\mathrm{log}\ g$ ), and metallicity ([M/H]) are derived from stellar spectra, then M , L , and stellar age ( t ) can be obtained by...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4365/ad8fa9 |
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| author | Qida Li Jianping Xiong Jiao Li Yanjun Guo Zhanwen Han Xuefei Chen Chao Liu |
| author_facet | Qida Li Jianping Xiong Jiao Li Yanjun Guo Zhanwen Han Xuefei Chen Chao Liu |
| author_sort | Qida Li |
| collection | DOAJ |
| description | Mass ( M ) and luminosity ( L ) are fundamental parameters of stars but can only be measured indirectly. Typically, effective temperature ( T _eff ), surface gravity ( $\mathrm{log}\ g$ ), and metallicity ([M/H]) are derived from stellar spectra, then M , L , and stellar age ( t ) can be obtained by interpolating in the grid of stellar evolutionary models. In this paper, we use random forest in combination with the evolutionary grid from PARSEC 1.2S to determine M , L , t , and initial mass ( M _i ) for early-type main-sequence stars ( T _eff ≥ 7000 K) as identified from the LAMOST survey. The convex hull algorithm is employed to select the main-sequence stars. The results demonstrate that the prediction precision is 32% and 9% for L and M , respectively, which is comparable to that achieved by fitting evolutionary tracks. Furthermore, the predicted L also aligns with Gaia’s observations, with a relative difference of 36%. The prediction for t is relatively less accurate, indicating a difference of 0.44 Gyr for two components in wide binaries. This discrepancy is due to the inconsistent metallicity measurements. For the two sets of atmospheric parameters we used, the relative differences in L , M , t , and M _i are 29%, 7%, 36%, and 7%, respectively. The influence of metallicity on these parameters is analyzed, with the conclusion that metallicity has the greatest impact on t . Consequently, two catalogs are presented, which could be useful for studying stellar populations such as the luminosity function and initial mass function of early-type stars. |
| format | Article |
| id | doaj-art-c09abae940fd43b1bb779a6c053e50ac |
| institution | Kabale University |
| issn | 0067-0049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Supplement Series |
| spelling | doaj-art-c09abae940fd43b1bb779a6c053e50ac2025-01-06T05:22:02ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127611910.3847/1538-4365/ad8fa9Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST SurveyQida Li0Jianping Xiong1https://orcid.org/0000-0003-4829-6245Jiao Li2https://orcid.org/0000-0002-2577-1990Yanjun Guo3https://orcid.org/0000-0001-9989-9834Zhanwen Han4https://orcid.org/0000-0001-9204-7778Xuefei Chen5https://orcid.org/0000-0001-5284-8001Chao Liu6https://orcid.org/0000-0002-1802-6917Yunnan Observatories, Chinese Academy of Sciences , Kunming, 650216, People's Republic of China ; cxf@ynao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing, 100049, People's Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , Kunming, 650216, People's Republic of China ; cxf@ynao.ac.cnYunnan Observatories, Chinese Academy of Sciences , Kunming, 650216, People's Republic of China ; cxf@ynao.ac.cnYunnan Observatories, Chinese Academy of Sciences , Kunming, 650216, People's Republic of China ; cxf@ynao.ac.cnYunnan Observatories, Chinese Academy of Sciences , Kunming, 650216, People's Republic of China ; cxf@ynao.ac.cnYunnan Observatories, Chinese Academy of Sciences , Kunming, 650216, People's Republic of China ; cxf@ynao.ac.cn; International Centre of Supernovae , Yunnan Key Laboratory, Kunming, 650216, People's Republic of ChinaSchool of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing, 100049, People's Republic of China; Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People's Republic of ChinaMass ( M ) and luminosity ( L ) are fundamental parameters of stars but can only be measured indirectly. Typically, effective temperature ( T _eff ), surface gravity ( $\mathrm{log}\ g$ ), and metallicity ([M/H]) are derived from stellar spectra, then M , L , and stellar age ( t ) can be obtained by interpolating in the grid of stellar evolutionary models. In this paper, we use random forest in combination with the evolutionary grid from PARSEC 1.2S to determine M , L , t , and initial mass ( M _i ) for early-type main-sequence stars ( T _eff ≥ 7000 K) as identified from the LAMOST survey. The convex hull algorithm is employed to select the main-sequence stars. The results demonstrate that the prediction precision is 32% and 9% for L and M , respectively, which is comparable to that achieved by fitting evolutionary tracks. Furthermore, the predicted L also aligns with Gaia’s observations, with a relative difference of 36%. The prediction for t is relatively less accurate, indicating a difference of 0.44 Gyr for two components in wide binaries. This discrepancy is due to the inconsistent metallicity measurements. For the two sets of atmospheric parameters we used, the relative differences in L , M , t , and M _i are 29%, 7%, 36%, and 7%, respectively. The influence of metallicity on these parameters is analyzed, with the conclusion that metallicity has the greatest impact on t . Consequently, two catalogs are presented, which could be useful for studying stellar populations such as the luminosity function and initial mass function of early-type stars.https://doi.org/10.3847/1538-4365/ad8fa9CatalogsEarly-type starsRandom Forests |
| spellingShingle | Qida Li Jianping Xiong Jiao Li Yanjun Guo Zhanwen Han Xuefei Chen Chao Liu Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST Survey The Astrophysical Journal Supplement Series Catalogs Early-type stars Random Forests |
| title | Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST Survey |
| title_full | Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST Survey |
| title_fullStr | Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST Survey |
| title_full_unstemmed | Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST Survey |
| title_short | Mass, Luminosity, and Stellar Age of Early-type Stars from the LAMOST Survey |
| title_sort | mass luminosity and stellar age of early type stars from the lamost survey |
| topic | Catalogs Early-type stars Random Forests |
| url | https://doi.org/10.3847/1538-4365/ad8fa9 |
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