A Combined Chandra and LAMOST Study of Stellar Activity
文献类型：期刊论文
| 作者 | He,Lin1,2; Wang,Song2 ; Liu,Jifeng2,3,4; Soria,Roberto3,5,6; Bai,Zhongrui2; Yang,Huiqin2,3; Bai,Yu2; Guo,Jincheng7
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2019-01-31 |
| 卷号 | 871期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | stars: activity stars: late-type X-rays: stars |
| DOI | 10.3847/1538-4357/aaf8b7 |
| 英文摘要 | Abstract We probed stellar X-ray activity over a wide range of stellar parameters, using Chandra and Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) data. We measured the X-ray-to-bolometric luminosity ratio ( ) for 484 main-sequence stars and found a bimodal distribution for G and K types. We interpret this bimodality as evidence of two subpopulations with different coronal temperatures, which are caused by different coronal heating rates. Using the metallicity and velocity information, we find that both of the subpopulations are mostly located in the thin disk. We find no trend of RX with stellar age for stars older than ～4 Gyr; there is a trough in the RX versus age distribution, with the lowest range of RX appearing at ages around 2 Gyr. We then examined the correlation between RX and RHα (proxy of chromospheric activity): we find that the two quantities are well correlated, as found in many earlier studies. Finally, we selected a sample of 12 stars with X-ray flares and studied the light-curve morphology of the flares. The variety of flare profiles and timescales observed in our sample suggests the contribution of different processes of energy release. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-871-2-AAF8B7 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/24960]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.School of Astronomy and Space Science and Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Nanjing 210093, People’s Republic of China 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China songw@bao.ac.cn 3.College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 4.WHU-NAOC Joint Center for Astronomy, Wuhan University, Wuhan, Hubei 430072, People’s Republic of China 5.International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia 6.Sydney Institute for Astronomy, School of Physics A28, The University of Sydney, Sydney, NSW 2006, Australia 7.Department of Astronomy, Peking University, Beijing 100871, People's Republic of China |
| 推荐引用方式 GB/T 7714 | He,Lin,Wang,Song,Liu,Jifeng,et al. A Combined Chandra and LAMOST Study of Stellar Activity[J]. The Astrophysical Journal,2019,871(2). |
| APA | He,Lin.,Wang,Song.,Liu,Jifeng.,Soria,Roberto.,Bai,Zhongrui.,...&Guo,Jincheng.(2019).A Combined Chandra and LAMOST Study of Stellar Activity.The Astrophysical Journal,871(2). |
| MLA | He,Lin,et al."A Combined Chandra and LAMOST Study of Stellar Activity".The Astrophysical Journal 871.2(2019). |
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来源：国家天文台
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