Estimating the Atmospheric Parameters of Early-type Stars from the Chinese Space Station Telescope (CSST) Slitless Spectra Survey
文献类型：期刊论文
| 作者 | Rao,JiaRui3,4; Chen,HaiLiang4 ; Xiong,JianPing4; Wang,LuQian4; Guo,YanJun3,4; Li,JiaJia3,4; Liu,Chao1,2,3; Han,ZhanWen4; Chen,XueFei4
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| 刊名 | The Astronomical Journal
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| 出版日期 | 2024-06-20 |
| 卷号 | 168期号:1 |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/ad4463 |
| 英文摘要 | Abstract The measurement of atmospheric parameters is fundamental for scientific research using stellar spectra. The Chinese Space Station Telescope (CSST), scheduled to be launched in 2024, will provide researchers with hundreds of millions of slitless spectra for stars during a 10 yr survey. And machine learning has unparalleled efficiency in processing large amounts of data compared to manual processing. Here we studied the stellar parameters of early-type stars (effective temperature T eff > 15,000 K) based on the design indicators of the CSST slitless spectrum and the machine learning algorithm, Stellar LAbel Machine. We used the Potsdam Wolf–Rayet (POWR) synthetic spectra library for cross validation. Then we tested the reliability of machine learning results by using the Next Generation Spectrum Library (NGSL) from Hubble Space Telescope observation data. In an ideal case for full-wavelength spectra without any noise, the average absolute value of the relative deviation is 2.7% (800 K) for T eff, and 3.5% (0.11 c.g.s) for surface gravity log g . We use the spectra with the impact of interstellar extinction (AV = 0, 0.5, 1, 1.5, 2 mag) and radial velocity (RV = ?50, ?30, 0, 30, 50 km s?1) from the POWR library as the test set. When RV = 0 km s?1 and AV = 0 mag, the average value and standard deviation for 3 wavelength ranges (2550–4050 ? (R = 287); 4050–6300 ? (R = 232); 6300–10000 ? (R = 207)) are –66 ± 3351 K, 550 ± 3536 K, and 356 ± 3616 K for T eff, and 0.004 ± 0.224 c.g.s, –0.024 ± 0.246 c.g.s, and 0.01 ± 0.212 c.g.s for log g . When using the observed data from NGSL as the testing samples, the deviation of T eff is less than 5% (1500 K), and the deviation of log g is less than 11% (0.33 c.g.s). In addition, we also test the influence of shifting of spectra on the parameters’ accuracy. The deviation of T eff for the case with a shift of 5 ? and 10 ? are 3.6% (1100 K) and 4.3% (1300 K), respectively; the deviation of log g are 4.2% (0.13 c.g.s) and 5.1% (0.15 c.g.s). These results demonstrate that we can obtain relatively accurate stellar parameters of a population of early-type stars with the CSST slitless spectra and a machine-learning method. |
| 语种 | 英语 |
| WOS记录号 | IOP:AJ_168_1_20 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/27455]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 作者单位 | 1.Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, 102299, People's Republic of China 2.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People's Republic of China 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China; liuchao@bao.ac.cn 4.Yunnan observatories, Chinese Academy of Sciences (CAS), Kunming, 650216, People's Republic of China; cxf@ynao.ac.cn |
| 推荐引用方式 GB/T 7714 | Rao,JiaRui,Chen,HaiLiang,Xiong,JianPing,et al. Estimating the Atmospheric Parameters of Early-type Stars from the Chinese Space Station Telescope (CSST) Slitless Spectra Survey[J]. The Astronomical Journal,2024,168(1). |
| APA | Rao,JiaRui.,Chen,HaiLiang.,Xiong,JianPing.,Wang,LuQian.,Guo,YanJun.,...&Chen,XueFei.(2024).Estimating the Atmospheric Parameters of Early-type Stars from the Chinese Space Station Telescope (CSST) Slitless Spectra Survey.The Astronomical Journal,168(1). |
| MLA | Rao,JiaRui,et al."Estimating the Atmospheric Parameters of Early-type Stars from the Chinese Space Station Telescope (CSST) Slitless Spectra Survey".The Astronomical Journal 168.1(2024). |
入库方式： OAI收割
来源：云南天文台
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