TRACERS OF CHROMOSPHERIC STRUCTURE. I. Ca II H&K EMISSION DISTRIBUTION OF 13,000 F, G, AND K STARS IN SDSS DR7 SPECTROSCOPIC SAMPLE
文献类型：期刊论文
| 作者 | Zhao, J. K.1,2; Oswalt, T. D.2; Zhao, G.1 ; Lu, Q. H.3; Luo, A. L.1; Zhang, L. Y.4
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2013-05-01 |
| 卷号 | 145期号:5 |
| 关键词 | stars: activity stars: emission-line, Be |
| 英文摘要 | We present chromospheric activity index SHK measurements for over 13,000 F, G, and K disk stars with high signal-to-noise ratio (>60) spectra in the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) spectroscopic sample. A parameter delta S is defined as the difference between SHK and a "zero" emission line fitted by several of the most inactive stars. The S-HK indices of subgiant stars tend to be much lower than dwarfs, which provide a way to distinguish dwarfs and giants with relatively low-resolution spectra. Cooler stars are generally more active and display a larger scatter than hotter stars. Stars associated with the thick disk are in general less active than those of the thin disk. The fraction of K dwarfs that are active drops with vertical distance from the Galactic plane. Metallicity affects S-HK measurements differently among F, G, and K dwarfs in this sample. Using the open clusters NGC 2420, M67, and NGC 6791 as calibrations, ages of most field stars in this SDSS sample range from 3 to 8 Gyr. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000317329100024 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5947]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Florida Inst Technol, Phys & Space Sci Dept, Melbourne, FL 32901 USA 3.Jiangsu Anim Husb & Vet Coll, Dept Informat Engn, Taizhou, Jiangsu, Peoples R China 4.Guizhou Univ, Guiyang 550003, Guizhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, J. K.,Oswalt, T. D.,Zhao, G.,et al. TRACERS OF CHROMOSPHERIC STRUCTURE. I. Ca II H&K EMISSION DISTRIBUTION OF 13,000 F, G, AND K STARS IN SDSS DR7 SPECTROSCOPIC SAMPLE[J]. ASTRONOMICAL JOURNAL,2013,145(5). |
| APA | Zhao, J. K.,Oswalt, T. D.,Zhao, G.,Lu, Q. H.,Luo, A. L.,&Zhang, L. Y..(2013).TRACERS OF CHROMOSPHERIC STRUCTURE. I. Ca II H&K EMISSION DISTRIBUTION OF 13,000 F, G, AND K STARS IN SDSS DR7 SPECTROSCOPIC SAMPLE.ASTRONOMICAL JOURNAL,145(5). |
| MLA | Zhao, J. K.,et al."TRACERS OF CHROMOSPHERIC STRUCTURE. I. Ca II H&K EMISSION DISTRIBUTION OF 13,000 F, G, AND K STARS IN SDSS DR7 SPECTROSCOPIC SAMPLE".ASTRONOMICAL JOURNAL 145.5(2013). |
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来源：国家天文台
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