Possible Evidence of Hydrogen Emission in the First-overtone and Multimode RR Lyrae Variables
文献类型：期刊论文
| 作者 | Duan,Xiao-Wei3,4,5; Chen,Xiao-Dian1,2,3; Deng,Li-Cai1,2,3,4; Yang,Fan3 ; Liu,Chao2,6; Bhardwaj,Anupam5; Zhang,Hua-Wei4,5
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| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 909期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | RRd variable stars RR Lyrae variable stars RRc variable stars Blazhko effect Stellar atmospheres Stellar atmospheric opacity Pulsation modes Stellar pulsations Shocks Spectroscopy Astronomy data analysis Astronomy databases |
| DOI | 10.3847/1538-4357/abd6b9 |
| 英文摘要 | Abstract The nature of shock waves in nonfundamental mode RR Lyrae stars remains a mystery because of limited spectroscopic observations. We apply a pattern recognition algorithm on spectroscopic data from SDSS and LAMOST and report the first evidence of hydrogen emission in first-overtone (RRc) and multimode (RRd) RR Lyrae stars showing the “first apparition,” which is the most prominent observational characteristic of shock in RR Lyrae variables. We find 10 RRc stars in SDSS, 10 RRc stars in LAMOST, and 3 RRd stars in LAMOST that show blueshifted Balmer emissions. The emission features possibly indicate the existence of shock waves. We calculate the radial velocities of the emission lines, which are related to the physical conditions occurring in the radiative zone of shock waves. Using photometric observations from ZTF, we present a detailed light-curve analysis for the frequency components in one of our RRd stars with hydrogen emission, RRdl3, for possible modulations. With the enormous volume of upcoming spectral observations of variable stars, our study raises the possibility of connecting the unexplained Blazhko effect to shock waves in nonfundamental mode RR Lyrae stars. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-909-1-ABD6B9 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/59721]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Deng,Li-Cai |
| 作者单位 | 1.Department of Astronomy, China West Normal University, Nanchong 637009, People's Republic of China 2.School of Astronomy and Space Science, University of the Chinese Academy of Sciences, Huairou 101408, People's Republic of China 3.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China licai@bao.ac.cn 4.Department of Astronomy, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871, People's Republic of China; duanxw@pku.edu.cn 5.Kavli Institute for Astronomy & Astrophysics, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871, People's Republic of China 6.CAS Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Duan,Xiao-Wei,Chen,Xiao-Dian,Deng,Li-Cai,et al. Possible Evidence of Hydrogen Emission in the First-overtone and Multimode RR Lyrae Variables[J]. The Astrophysical Journal,2021,909(1). |
| APA | Duan,Xiao-Wei.,Chen,Xiao-Dian.,Deng,Li-Cai.,Yang,Fan.,Liu,Chao.,...&Zhang,Hua-Wei.(2021).Possible Evidence of Hydrogen Emission in the First-overtone and Multimode RR Lyrae Variables.The Astrophysical Journal,909(1). |
| MLA | Duan,Xiao-Wei,et al."Possible Evidence of Hydrogen Emission in the First-overtone and Multimode RR Lyrae Variables".The Astrophysical Journal 909.1(2021). |
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来源：国家天文台
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