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KIC 3440495: A Rapidly Rotating δ Scuti-γ Doradus Hybrid Pulsator in a Binary System

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 f rot = 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 , R equator = [2.03, 2.30] R , R polar = [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.
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https://hal-insu.archives-ouvertes.fr/insu-03867384
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Wednesday, November 23, 2022 - 1:00:59 PM
Last modification on : Thursday, November 24, 2022 - 4:04:53 AM

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Shuguo Ma, Ali Esamdin, Antonio García Hernández, Simon J. Murphy, Chenglong Lv, et al.. KIC 3440495: A Rapidly Rotating δ Scuti-γ Doradus Hybrid Pulsator in a Binary System. The Astrophysical Journal, 2022, 937, ⟨10.3847/1538-4357/ac8c30⟩. ⟨insu-03867384⟩

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