Superoutbursts and Positive Superhumps Occurred during the Standstill of a Z Cam-type Dwarf Nova
文献类型：期刊论文
| 作者 | Sun, Qi-Bin3,4; Qian, Sheng-Bang3,4; Zhu LY(朱俐颖)1,2 ; Li, Qin-Mei3,4; Li FX(李福兴)2,4; Li MY(李敏榆)1,2; Li P(李平)1,2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2025-04-01 |
| 卷号 | 982期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/adb7d9 |
| 产权排序 | 第3完成单位 |
| 文献子类 | Article |
| 英文摘要 | Dwarf novae (DNe) are semidetached binaries, where a white dwarf accretes material from a cool main-sequence companion via an accretion disk, and are known for their intermittent outbursts, making them key systems for studying accretion physics. The accumulation of large survey data sets has challenged traditional models, which assumed that the disk remains hot and cannot produce superoutbursts during the standstill of a Z Camelopardalis (Z Cam)-type DN and that superoutbursts require a mass ratio of q = M2/M1 <= 0.25-0.33. Here we report the detection of superoutbursts and positive superhumps (PSHs) during a standstill in the Z Cam-type star AT Cnc with a mass ratio larger than 0.33. Notably, the PSHs evolve gradually before the superoutburst begins, suggesting that an eccentric, precessing disk forms first, with the superoutburst occurring as the disk radius continues to expand. These findings provide the first detailed observational evidence of superoutbursts and PSHs occurring during standstill, offering important new insights into the classification of DNe and the underlying mechanisms of outbursts. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| WOS关键词 | QUASI-PERIODIC OSCILLATIONS ; DISK INSTABILITY MODEL ; IW AND-TYPE ; MASS-TRANSFER ; NEGATIVE SUPERHUMPS ; ACCRETION DISKS ; VARIABLE-STARS ; HS 2325+8205 ; OUTBURSTS ; SIMULATIONS |
| 资助项目 | MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[2022YFE0116800]; National Key R&D Program of China[11933008]; National Natural Science Foundation of China |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001450983200001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[2022YFE0116800] ; National Key R&D Program of China[11933008] ; National Natural Science Foundation of China |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28221]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 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.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China; 3.Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, Kunming 650091, People's Republic of China; 4.Department of Astronomy, School of Physics and Astronomy, Yunnan University, Kunming 650091, People's Republic of China; qiansb@ynu.edu.cn; |
| 推荐引用方式 GB/T 7714 | Sun, Qi-Bin,Qian, Sheng-Bang,Zhu LY,et al. Superoutbursts and Positive Superhumps Occurred during the Standstill of a Z Cam-type Dwarf Nova[J]. ASTROPHYSICAL JOURNAL,2025,982(2). |
| APA | Sun, Qi-Bin.,Qian, Sheng-Bang.,朱俐颖.,Li, Qin-Mei.,李福兴.,...&李平.(2025).Superoutbursts and Positive Superhumps Occurred during the Standstill of a Z Cam-type Dwarf Nova.ASTROPHYSICAL JOURNAL,982(2). |
| MLA | Sun, Qi-Bin,et al."Superoutbursts and Positive Superhumps Occurred during the Standstill of a Z Cam-type Dwarf Nova".ASTROPHYSICAL JOURNAL 982.2(2025). |
入库方式： OAI收割
来源：云南天文台
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