Rotational Velocities of Am and Non-chemical-peculiar Stars Based on Kepler and LAMOST DR5
文献类型：期刊论文
| 作者 | Qin,Li1,4,5; Luo,A-Li1,4,5; Hou,Wen4; Li,Yin-Bi4; Cui,Kai-Ming4,5; Zuo,Fang4,5; Zhang,Shuo2,3; Wang,Rui4; Han,Jin-Shu1; Wang,Li-Li1 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2021-06-28 |
| 卷号 | 162期号:1 |
| 关键词 | Chemically peculiar stars |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/ac0052 |
| 英文摘要 | Abstract Rotation is a critical physical process operating in the formation of Am stars. There is a strong correlation between low-velocity rotation and chemical peculiarity. However, the existence of many non-chemical-peculiar slow rotators challenges the understanding of Am stars. The purpose of our work is to search for low-velocity rotating non-chemical-peculiar A-type stars and Am stars and to make a comparative analysis. In this paper, we pick out a sample from the LAMOST–Kepler project, including 21 Am stars, 125 non-chemical-peculiar slow rotators, and 53 non-chemical-peculiar fast rotators. We calculate the rotational frequencies through a periodic change of light curves caused by inhomogeneous stellar surfaces and then obtain the rotational velocities. For slow rotators, the age of Am stars is statistically younger than that of non-chemical-peculiar stars in the same temperature bin. In the comparison of the period, the average amplitude, and stellar mass of Am and non-chemical-peculiar stars, we discover that there is no difference in the photometric variability between Am and non-chemical-peculiar stars, which implies similar inhomogeneities on the surfaces. The average amplitude of non-chemical-peculiar stars has a downward trend with the increase of effective temperature and stellar mass, which is consistent with the theoretical prediction caused by weak dynamo-generated magnetic fields in A-type stars. In addition, we confirm four non-chemical-peculiar stars that have flares by checking field-of-view images, pixel images, and pixel-level light curves. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-6256-162-1-AC0052 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/57028]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Luo,A-Li |
| 作者单位 | 1.School of Information Management & Institute for Astronomical Science, Dezhou University, Dezhou 253023, People's Republic of China 2.Kavli Institute of Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of China 3.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China 4.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Beijing 100101, People's Republic of China; lal@nao.cas.cn, whou@nao.cas.cn 5.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Qin,Li,Luo,A-Li,Hou,Wen,et al. Rotational Velocities of Am and Non-chemical-peculiar Stars Based on Kepler and LAMOST DR5[J]. The Astronomical Journal,2021,162(1). |
| APA | Qin,Li.,Luo,A-Li.,Hou,Wen.,Li,Yin-Bi.,Cui,Kai-Ming.,...&Chen,Xiang-Lei.(2021).Rotational Velocities of Am and Non-chemical-peculiar Stars Based on Kepler and LAMOST DR5.The Astronomical Journal,162(1). |
| MLA | Qin,Li,et al."Rotational Velocities of Am and Non-chemical-peculiar Stars Based on Kepler and LAMOST DR5".The Astronomical Journal 162.1(2021). |
入库方式： OAI收割
来源：国家天文台
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