%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