TIC 308396022: δ Scuti-γ Doradus hybrid with large-amplitude radial fundamental mode and regular g-mode period spacing
Article
Article Title | TIC 308396022: δ Scuti-γ Doradus hybrid with large-amplitude radial fundamental mode and regular g-mode period spacing |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Yang, Tao-Zhi (Author), Zuo, Zhao-Yu (Author), Li, Gang (Author), Bedding, Timothy R. (Author), Murphy, Simon J. (Author) and Joyce, Meridith (Author) |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 655, pp. 1-7 |
Article Number | A63 |
Number of Pages | 7 |
Year | 2021 |
Publisher | EDP Sciences |
Place of Publication | France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202142198 |
Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2021/11/aa42198-21/aa42198-21.html |
Abstract | We analyse the pulsating behaviour of TIC 308396022, based on observations by the TESS mission. The star is a high-amplitude δ Sct star that shows a very rich amplitude spectrum using the 3-yr light curve. Among these frequencies, the strongest peak of f1 = 13.20362567(12) d−1 is identified as the radial fundamental mode, and we also find the first and second overtones (f2 and f3). In the low-frequency range (< 2.5 d−1), 22 peaks are identified as gravity modes, which show a regular period spacing of about 2460 s and have an angular degree of l = 1. The period spacing pattern does not show a significant downward trend, suggesting the star is rotating slowly. We note that this is a δ Sct–γ Dor hybrid star containing a high-amplitude radial fundamental mode and a regular g-mode period spacing pattern. With the O − C analysis, we find the star shows a significant time delay, implying that the star has a companion and it is likely to be a white dwarf. The history of possible mass transfer provides a great opportunity for testing the current theories of binary evolution, mass transfer, and pulsation. |
Keywords | stars: oscillations; stars: variables: δ Scuti; stars: individual: TIC 308396022; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Xi'an Jiaotong University, China |
University of Toulouse, France | |
University of Sydney | |
Space Telescope Science Institute, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73wq/tic-308396022-scuti-doradus-hybrid-with-large-amplitude-radial-fundamental-mode-and-regular-g-mode-period-spacing
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