%0 Journal Article %T TIC 308396022: δ Scuti-γ Doradus hybrid with large-amplitude radial fundamental mode and regular g-mode period spacing %+ Institut de recherche en astrophysique et planétologie (IRAP) %A Yang, Tao-Zhi %A Zuo, Zhao-Yu %A Li, Gang %A Bedding, Timothy R. %A Murphy, Simon J. %A Joyce, Meridith %< avec comité de lecture %@ 0004-6361 %J Astronomy and Astrophysics - A&A %I EDP Sciences %V 655 %8 2021 %D 2021 %Z 2110.00485 %Z 2021A&A...655A..63Y %R 10.1051/0004-6361/202142198 %K stars: oscillations %K stars: variables: δ Scuti %K stars: individual: TIC 308396022 %K Astrophysics - Solar and Stellar Astrophysics %Z Sciences of the Universe [physics] %Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles %X 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. %G English %2 https://insu.hal.science/insu-03672383/document %2 https://insu.hal.science/insu-03672383/file/aa42198-21.pdf %L insu-03672383 %U https://insu.hal.science/insu-03672383 %~ IRD %~ INSU %~ METEO %~ UNIV-TLSE3 %~ CNRS %~ CNES %~ OMP %~ OMP-IRAP %~ ANR %~ UNIV-UT3 %~ UT3-INP %~ UT3-TOULOUSEINP