KIC 3440495: A Rapidly Rotating δ Scuti-γ Doradus Hybrid Pulsator in a Binary System
Article
| Article Title | KIC 3440495: A Rapidly Rotating δ Scuti-γ Doradus Hybrid Pulsator in a Binary System |
|---|---|
| ERA Journal ID | 1057 |
| Article Category | Article |
| Authors | Ma, Shuguo, Esamdin, Ali, Hernández, Antonio García, Murphy, Simon J., Lv, Chenglong, Wei, Peng, Rieutord, Michel, Pascual-Granado, Javier, Dang, Fei, Niu, Hubiao, Yang, TaoZhi, Feng, Guojie, Karimov, Rivkat and Tillayev, Yusuf |
| Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
| Journal Citation | 937 (2) |
| Number of Pages | 15 |
| Year | 2022 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-637X |
| 1538-4357 | |
| Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ac8c30 |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ac8c30 |
| Abstract | In this paper, we study the pulsation properties of KIC 3440495 using Kepler and TESS data. A Fourier analysis of the light curve reveals 24 pulsation modes as well as 29 frequencies associated with rotation. The rotation frequency is derived to be frot = 2.322909(2) day−1, and the rotational modulation is determined to be caused by starspots. A large frequency separation of Δν = 54.5 μHz is found by using a Fourier transform, the autocorrelation function, a histogram of frequency differences, and an échelle diagram. We use the large separation to estimate the refined stellar parameters of the star to be v = [239, 279] km s−1, M = [1.5, 1.65] M⊙, Requator = [2.03, 2.30] R⊙, Rpolar = [1.72, 1.78] R⊙, and ω = [0.61, 0.77]. The phase modulations of the pulsating frequencies show a long-term trend which may be attributed to an orbital effect of a binary system; hence, the star may be a fast rotating pulsator in a binary system. KIC 3440495 has an amplitude spectrum similar to Altair, and is identified as a potential sister of Altair. Based on studies of Altair, KIC 3330495 is presumably a young star at a similar evolutionary stage. |
| Keywords | Binary System; TESS data |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Byline Affiliations | Chinese Academy of Sciences, China |
| University of Granada, Spain | |
| Centre for Astrophysics | |
| University of Toulouse, France | |
| Institute of Astrophysics of Andalusia, Spain | |
| Xi'an Jiaotong University, China | |
| Academy of Sciences of the Republic of Uzbekistan, Uzbekistan |
https://research.usq.edu.au/item/z0260/kic-3440495-a-rapidly-rotating-scuti-doradus-hybrid-pulsator-in-a-binary-system
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