Evolution of Negative Superhumps, Quasiperiodic Oscillations, and Outbursts in the Z Cam-type Dwarf Nova AH Her
文献类型：期刊论文
| 作者 | Sun,Qi-Bin1,2,3,4; Qian,Sheng-Bang1,2,3,4; Li,Min-Yu1,2,4; Qian SB(钱声帮) ; Sun QB(孙起斌); Li MY(李敏榆)
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2023-09-26 |
| 卷号 | 955期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ace183 |
| 通讯作者 | Qian,Sheng-Bang() |
| 英文摘要 | Abstract AH Her is a Z Cam-type dwarf nova with an orbital period of ～0.258 days. Dwarf nova oscillations and long-period dwarf nova oscillations have been detected, but no quasiperiodic oscillations (QPOs) and negative superhumps (NSHs) have been found. We investigated the association between NSHs, QPOs, and outbursts of AH Her based on Transiting Exoplanet Survey Satellite photometry. We find for the first time NSHs with a period of 0.24497(1) days in AH Her, and trace the variation in the amplitude and period of NSHs with the outburst. The amplitude of the NSHs is the most significant at quiescence, weakening as the outburst rises, becoming undetectable at the top, rebounding and weakening at the plateau, and strengthening again as the outburst declines. The variation in the accretion disk radius can explain the NSH amplitude variation except for the plateau, so we suggest that the relationship between the NSH amplitude and outburst can be used as a window to study the accretion disk instability and the origin of NSHs. In addition, we find periodic variations in the amplitude, maxima, and shape of the NSHs ranging from 2.33(2) to 2.68(5) days, which may be related to the precession of the tilted disk. Finally, we find QPOs at the top of AH Her’s long outburst with ～2800 s similar to those of HS 2325+8205, suggesting that the presence of QPOs at the top of Z Cam’s long outburst may be a general phenomenon. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:APJ_955_2_135 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/26334]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 通讯作者 | Qian,Sheng-Bang; Sun QB(孙起斌) |
| 作者单位 | 1.University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, People’s Republic of China 2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of China 3.Department of Astronomy, Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, Kunming 650091, People’s Republic of China 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; sunqibin@ynao.ac.cn, qsb@ynao.ac.cn |
| 推荐引用方式 GB/T 7714 | Sun,Qi-Bin,Qian,Sheng-Bang,Li,Min-Yu,et al. Evolution of Negative Superhumps, Quasiperiodic Oscillations, and Outbursts in the Z Cam-type Dwarf Nova AH Her[J]. The Astrophysical Journal,2023,955(2). |
| APA | Sun,Qi-Bin,Qian,Sheng-Bang,Li,Min-Yu,Qian SB,Sun QB,&Li MY.(2023).Evolution of Negative Superhumps, Quasiperiodic Oscillations, and Outbursts in the Z Cam-type Dwarf Nova AH Her.The Astrophysical Journal,955(2). |
| MLA | Sun,Qi-Bin,et al."Evolution of Negative Superhumps, Quasiperiodic Oscillations, and Outbursts in the Z Cam-type Dwarf Nova AH Her".The Astrophysical Journal 955.2(2023). |
入库方式： OAI收割
来源：云南天文台
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