Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 Survey
In this study, we present a comprehensive study of more than 50,000 spectra of 32,257 eclipsing binaries from the LAMOST DR10 survey, including 5200 systems with spectroscopy. We quantified their chromospheric activity through H α spectral subtraction with iSpec, among 20,000 binaries showing signif...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4365/adf329 |
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| author | Ansong Shi Li-yun Zhang Tianhao Su Yinpeng Wang Qi An Xianming L. Han Prabhakar Misra Linyan Jiang Rui Guo Qingfeng Pi |
| author_facet | Ansong Shi Li-yun Zhang Tianhao Su Yinpeng Wang Qi An Xianming L. Han Prabhakar Misra Linyan Jiang Rui Guo Qingfeng Pi |
| author_sort | Ansong Shi |
| collection | DOAJ |
| description | In this study, we present a comprehensive study of more than 50,000 spectra of 32,257 eclipsing binaries from the LAMOST DR10 survey, including 5200 systems with spectroscopy. We quantified their chromospheric activity through H α spectral subtraction with iSpec, among 20,000 binaries showing significant excess emission. The chromospheric activity increases toward shorter orbital periods and lower metallicity. By combining tidally locked rotation periods with convective turnover times, we have computed their Rossby numbers and uncovered a geometry-driven shift in the saturation threshold: the detached EA systems saturate at ${\mathrm{logRo}}\,\simeq \,-1.3$ (Ro ≈ 0.05), whereas equivalent width (EW) contact binaries, owing to their common convective envelope (CCE), do not reach saturation until ${\mathrm{logRo}}\,\simeq \,-1.6$ (Ro ≈ 0.025). The CCE enlarges the magnetic-flux reservoir via L _1 -spanning field lines and strong shear effects, demanding faster rotation to attain the chromospheric limit. For Ro ≲ 0.02, we observe a mild downturn consistent with supersaturation. The high-precision Transiting Exoplanet Survey Satellite light curves for 4326 eclipsing binaries reveal starspot amplitudes that correlate tightly with the H α activity, confirming enhanced magnetism in close binaries. We have detected 1752 flare events (1179 from 208 EA, 429 from 44 EB, 144 from EW) on eclipsing binaries. We also determined their parameters and the flare frequency distributions in the different types of eclipsing binaries. In the end, we also give the plan of eclipsing binaries in the LAMOST low and medium-resolution spectra future survey. |
| format | Article |
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| 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-1cd447ecbc164dea88b3df946bef4fac2025-08-26T06:03:01ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0128012610.3847/1538-4365/adf329Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 SurveyAnsong Shi0Li-yun Zhang1https://orcid.org/0000-0002-2394-9521Tianhao Su2https://orcid.org/0000-0002-1900-9289Yinpeng Wang3Qi An4Xianming L. Han5https://orcid.org/0000-0001-7638-0351Prabhakar Misra6https://orcid.org/0000-0001-6843-7135Linyan Jiang7Rui Guo8Qingfeng Pi9College of Physics, Guizhou University , Guiyang 550025, People’s Republic of China ; liy_zhang@hotmail.comCollege of Physics, Guizhou University , Guiyang 550025, People’s Republic of China ; liy_zhang@hotmail.com; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences , Kunming 650011, People’s Republic of ChinaCollege of Physics, Guizhou University , Guiyang 550025, People’s Republic of China ; liy_zhang@hotmail.comCollege of Physics, Guizhou University , Guiyang 550025, People’s Republic of China ; liy_zhang@hotmail.comCollege of Physics, Guizhou University , Guiyang 550025, People’s Republic of China ; liy_zhang@hotmail.comCollege of Physics, Guizhou University , Guiyang 550025, People’s Republic of China ; liy_zhang@hotmail.com; Department of Physics and Astronomy and SARA, Butler University , Indianapolis, IN 46208, USADepartment of Physics & Astronomy, Howard University , Washington, DC 20059, USADepartment of Public Teaching, Guiyang Institute of Information Science and Technology , Guiyang 550025, People’s Republic of ChinaCollege of Foreign Languages, Guizhou University , Guiyang 550025, People’s Republic of ChinaSchool of Pharmacy, Guizhou University of Traditional Chinese Medicine , Guiyang 550025, People’s Republic of ChinaIn this study, we present a comprehensive study of more than 50,000 spectra of 32,257 eclipsing binaries from the LAMOST DR10 survey, including 5200 systems with spectroscopy. We quantified their chromospheric activity through H α spectral subtraction with iSpec, among 20,000 binaries showing significant excess emission. The chromospheric activity increases toward shorter orbital periods and lower metallicity. By combining tidally locked rotation periods with convective turnover times, we have computed their Rossby numbers and uncovered a geometry-driven shift in the saturation threshold: the detached EA systems saturate at ${\mathrm{logRo}}\,\simeq \,-1.3$ (Ro ≈ 0.05), whereas equivalent width (EW) contact binaries, owing to their common convective envelope (CCE), do not reach saturation until ${\mathrm{logRo}}\,\simeq \,-1.6$ (Ro ≈ 0.025). The CCE enlarges the magnetic-flux reservoir via L _1 -spanning field lines and strong shear effects, demanding faster rotation to attain the chromospheric limit. For Ro ≲ 0.02, we observe a mild downturn consistent with supersaturation. The high-precision Transiting Exoplanet Survey Satellite light curves for 4326 eclipsing binaries reveal starspot amplitudes that correlate tightly with the H α activity, confirming enhanced magnetism in close binaries. We have detected 1752 flare events (1179 from 208 EA, 429 from 44 EB, 144 from EW) on eclipsing binaries. We also determined their parameters and the flare frequency distributions in the different types of eclipsing binaries. In the end, we also give the plan of eclipsing binaries in the LAMOST low and medium-resolution spectra future survey.https://doi.org/10.3847/1538-4365/adf329Stellar chromospheresStellar activity |
| spellingShingle | Ansong Shi Li-yun Zhang Tianhao Su Yinpeng Wang Qi An Xianming L. Han Prabhakar Misra Linyan Jiang Rui Guo Qingfeng Pi Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 Survey The Astrophysical Journal Supplement Series Stellar chromospheres Stellar activity |
| title | Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 Survey |
| title_full | Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 Survey |
| title_fullStr | Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 Survey |
| title_full_unstemmed | Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 Survey |
| title_short | Physical Parameters and Chromospheric Activity of Eclipsing Binaries Observed by the LAMOST DR10 Survey |
| title_sort | physical parameters and chromospheric activity of eclipsing binaries observed by the lamost dr10 survey |
| topic | Stellar chromospheres Stellar activity |
| url | https://doi.org/10.3847/1538-4365/adf329 |
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