The UV Emission of Stars in the LAMOST Survey. I. Catalogs
文献类型：期刊论文
| 作者 | Bai,Yu2 ; Liu,JiFeng2,3; Wicker,James4; Wang,Song2; Guo,JinCheng2,5; Qin,YuXiang1; He,Lin2,3; Wang,JianLing2; Wu,Yue2; Dong,YiQiao2
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| 刊名 | The Astrophysical Journal Supplement Series
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| 出版日期 | 2018-03-07 |
| 卷号 | 235期号:1 |
| 关键词 | stars: activity stars: general ultraviolet: stars |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/aaaab9 |
| 英文摘要 | Abstract We present the ultraviolet magnitudes for over three million stars in the LAMOST survey, in which 2,202,116 stars are detected by GALEX. For 889,235 undetected stars, we develop a method to estimate their upper limit magnitudes. The distribution of (FUV???NUV) shows that the color declines with increasing effective temperature for stars hotter than 7000 K in our sample, while the trend disappears for the cooler stars due to upper atmosphere emission from the regions higher than their photospheres. For stars with valid stellar parameters, we calculate the UV excesses with synthetic model spectra, and find that the (FUV???NUV) versus can be fitted with a linear relation and late-type dwarfs tend to have high UV excesses. There are 87,178 and 1,498,103 stars detected more than once in the visit exposures of GALEX in the FUV and NUV, respectively. We make use of the quantified photometric errors to determine statistical properties of the UV variation, including intrinsic variability and the structure function on the timescale of days. The overall occurrence of possible false positives is below 1.3% in our sample. UV absolute magnitudes are calculated for stars with valid parallaxes, which could serve as a possible reference frame in the NUV. We conclude that the colors related to UV provide good criteria to distinguish between M giants and M dwarfs, and the variability of RR Lyrae stars in our sample is stronger than that of other A and F stars. |
| 语种 | 英语 |
| WOS记录号 | IOP:0067-0049-235-1-AAAAB9 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/24658]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.School of Physics, Parkville, Victoria 3010, Australia 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang Distict, Beijing 100012, People’s Republic of China; ybai@nao.cas.cn 3.College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 4.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang Distict, Beijing 100012, People’s Republic of China 5.Department of Astronomy, Peking University, Beijing 100871, People’s Republic of China 6.Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Bai,Yu,Liu,JiFeng,Wicker,James,et al. The UV Emission of Stars in the LAMOST Survey. I. Catalogs[J]. The Astrophysical Journal Supplement Series,2018,235(1). |
| APA | Bai,Yu.,Liu,JiFeng.,Wicker,James.,Wang,Song.,Guo,JinCheng.,...&Cao,Zihuang.(2018).The UV Emission of Stars in the LAMOST Survey. I. Catalogs.The Astrophysical Journal Supplement Series,235(1). |
| MLA | Bai,Yu,et al."The UV Emission of Stars in the LAMOST Survey. I. Catalogs".The Astrophysical Journal Supplement Series 235.1(2018). |
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