Asteroseismology of a Double-mode High-amplitude δ Scuti Star TIC 448892817
文献类型：期刊论文
| 作者 | Lv,Chenglong2,5; Esamdin,Ali2,5; Pascual-Granado,J.4; Hernández,A. García3; Hasanzadeh,A.1 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2022-10-26 |
| 卷号 | 164期号:5 |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/ac9473 |
| 通讯作者 | Esamdin,Ali() |
| 英文摘要 | Abstract We propose that TIC 448892817 is a double-mode high-amplitude δ Scuti star. The radial modes detected in this star provide a unique opportunity to exploit asteroseismic techniques up to their limits. 30 significant frequencies are detected by frequency analysis, while two of them are independent frequencies, i.e., F0 = 13.43538(2) day?1 and F1 = 17.27007(4) day?1. The ratio of f 1/f 2 is measured to be 0.777957(2), suggesting that this target is a double-mode δ Scuti star. Nearly all the light variation is due to these two modes and their combination frequencies, but several other frequencies of very low amplitude are also present. The stellar evolutionary models were constructed with different mass M and metallicity Z using Modules for Experiments in Stellar Astrophysics (MESA). The frequency ratio f 1/f 2 obtained by the model is smaller than those obtained by observation. This might be caused by the rotation of the star pointing that rotational effects are more important than previously thought in HADS stars. This is something that deserves to be investigated in future works with models including rotational effects for moderate to intermediate rotators such as FILOU. On the other hand, the parameters obtained from MESA agree well with previous results as well as by observational spectra. The best-fitting model shows that TIC 448892817 is close to entering the first turnoff of the main sequence. In order to accurately determine the effective temperature and metallicities, thus further narrowing the parameter space of this star, we suggest high-resolution spectra is highly desired in the future. |
| 语种 | 英语 |
| WOS记录号 | IOP:AJ_164_5_218 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/6186]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Esamdin,Ali |
| 作者单位 | 1.Institute of Geophysics, University of Tehran, Tehran, Iran 2.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China; aliyi@xao.ac.cn 3.Universidad de Granada, Dept. Theoretical Physics and Cosmology, E-18071, Granada, Spain 4.Instituto de Astrofísica de Andalucía—CSIC, E-18008 Granada, Spain 5.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Lv,Chenglong,Esamdin,Ali,Pascual-Granado,J.,et al. Asteroseismology of a Double-mode High-amplitude δ Scuti Star TIC 448892817[J]. The Astronomical Journal,2022,164(5). |
| APA | Lv,Chenglong,Esamdin,Ali,Pascual-Granado,J.,Hernández,A. García,&Hasanzadeh,A..(2022).Asteroseismology of a Double-mode High-amplitude δ Scuti Star TIC 448892817.The Astronomical Journal,164(5). |
| MLA | Lv,Chenglong,et al."Asteroseismology of a Double-mode High-amplitude δ Scuti Star TIC 448892817".The Astronomical Journal 164.5(2022). |
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