KIC 3440495: A Rapidly Rotating δ Scuti-γ Doradus Hybrid Pulsator in a Binary System Ma, Shuguo García Hernández, Antonio Pascual Granado, Javier 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] Me, Requator = [2.03, 2.30] Re, Rpolar = [1.72, 1.78] Re, 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. 2022-10-19T11:07:18Z 2022-10-19T11:07:18Z 2022-10-01 journal article Shuguo Ma... [et al.] 2022 ApJ 937 80. [https://doi.org/10.3847/1538-4357/ac8c30] https://hdl.handle.net/10481/77395 10.3847/1538-4357/ac8c30 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Institute of Physics