Re-Examining Super-Nyquist Frequencies of 68 δ Scuti Stars Utilizing the Kepler Long-Cadence Photometry
文献类型：期刊论文
| 作者 | Yang, Zilu1,3; Fu, Jianning1,2,3; Wang, Xuan1,3; Mo, Yanqi1,3; Zong, Weikai1,3 |
| 刊名 | UNIVERSE
 |
| 出版日期 | 2025-07-25 |
| 卷号 | 11期号:8页码:246 |
| 关键词 | super-Nyquist frequency
pulsation frequency
|
| DOI | 10.3390/universe11080246 |
| 产权排序 | 3 |
| 英文摘要 | The high-precision and long-duration photometry provided by the Kepler mission has greatly advanced frequency analyses of a large number of pulsating stars, a fundamental step in asteroseismology. For delta Scuti stars, analyses are typically confined to frequencies below the Nyquist frequency. However, signals above this limit can be reflected into the sub-Nyquist range, especially in long-cadence data, where they may overlap with genuine pulsation modes and lead to misinterpretation. To address this issue, a recently proposed method-the sliding Lomb-Scargle periodogram (sLSP)-can effectively distinguish real frequencies from aliased ones. In this study, we compiled a sample of 68 delta Scuti stars whose frequency analyses were based on the Kepler photometry. Using the sLSP method, we systematically examined the 1406 reported frequencies in the literature. As a result, we identified six previously unrecognized reflected super-Nyquist frequencies in four stars: KIC 3440495, KIC 5709664, KIC 7368103, and KIC 9204718. We have once again demonstrated the ability of the sLSP method to detect and correct such artifacts. This technique improves the reliability of frequency selection, thereby enhancing the accuracy of asteroseismic interpretation and stellar modeling for pulsating stars. |
| WOS关键词 | TO-CORE ROTATION ; BINARY-SYSTEM ; ECLIPSING BINARY ; SPECTROSCOPIC CONFIRMATION ; ASTEROSEISMIC MEASUREMENT ; AMPLITUDE-MODULATION ; MAIN-SEQUENCE ; SCT STAR ; PULSATIONS ; OSCILLATIONS |
| 资助项目 | China Manned Space Program ; Central Guidance for Local Science and Technology Development Fund[ZYYD2025QY27] ; National Natural Science Foundation of China (NSFC)[12090040] ; National Natural Science Foundation of China (NSFC)[12090042] ; National Natural Science Foundation of China (NSFC)[12427804] ; [CMS-CSST-2025-A013] |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001558610100001 |
| 出版者 | MDPI |
| 资助机构 | China Manned Space Program ; Central Guidance for Local Science and Technology Development Fund ; National Natural Science Foundation of China (NSFC) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8086]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Fu, Jianning |
| 作者单位 | 1.Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing 102206, Peoples R China 2.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 3.Beijing Normal Univ, Sch Phys & Astron, Beijing 100875, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Zilu,Fu, Jianning,Wang, Xuan,et al. Re-Examining Super-Nyquist Frequencies of 68 δ Scuti Stars Utilizing the Kepler Long-Cadence Photometry[J]. UNIVERSE,2025,11(8):246. |
| APA | Yang, Zilu,Fu, Jianning,Wang, Xuan,Mo, Yanqi,&Zong, Weikai.(2025).Re-Examining Super-Nyquist Frequencies of 68 δ Scuti Stars Utilizing the Kepler Long-Cadence Photometry.UNIVERSE,11(8),246. |
| MLA | Yang, Zilu,et al."Re-Examining Super-Nyquist Frequencies of 68 δ Scuti Stars Utilizing the Kepler Long-Cadence Photometry".UNIVERSE 11.8(2025):246. |
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