@misc{10481/97104,
year = {2024},
month = {10},
url = {https://hdl.handle.net/10481/97104},
abstract = {In this paper, we analyze the light variation of KIC 8840638 using high-precision time-series data from the Kepler
mission. The analysis reveals that this target is a new detached eclipsing binary system with a δ Scuti component,
rather than a single δ Scuti star as previously known. The frequency analysis of short-cadence data reveals 95
significant frequencies, most of which lie in a frequency range of 23−32 day−1. Among them, seven independent
frequencies are detected in the typical frequency range of δ Scuti stars, and they are identified as pressure modes. In
addition, a possible large separation value of Δν = 36.5 ± 0.1 μHz is also detected with the Fourier transform (FT)
and autocorrelation function (AC) analysis. The orbital frequency forb (= 0.320008 day−1) and its harmonics are
also detected directly in the frequency spectrum. The binary modelings derived from PHOEBE indicate that this
binary system is in detached configurations with a mass ratio of q 0.33 0.04
= -0.06
+ , an inclination angle of 40.19 2.84
3.96
-
+ °.
The derived parameters and binary evolutionary model suggest that the primary star is an object on the verge of
leaving the main sequence with a temperature of ∼7600 K, while the secondary appears to be a cool component
entering the giant branch with a temperature ∼3100 K lower than the primary. Moreover, this system may have
undergone a mass ratio reversal, where the more massive star is the gainer component and the less massive one is
the donor star.},
organization = {Program of the
National Natural Science Foundation of China (grant Nos. 12003020, 12473043)},
organization = {Shaanxi Fundamental Science
Research Project for Mathematics and Physics (grant No.
23JSY015)},
organization = {Spanish State Research Agency (AEI) project PID2019-
107061GB-064},
organization = {National Key R&D Program of China No.
2021YFA1600403},
organization = {National Natural Science Foundation of
China (Nos. 12473033,12073070, 12333008, 12288102,
12090040/3)},
organization = {Western Light Project of CAS (No.
XBZG-ZDSYS-202117)},
organization = {ational Centre of Supernovae,
Yunnan Key Laboratory (No. 202302AN360001)},
organization = {Yunnan
Fundamental Research Project (No. 202201BC070003,
202401BC070007)},
organization = {Yunnan Revitalization Talent Support
Program—Science & Technology Champion Project (No.
202305AB350003)},
organization = {Yunnan Ten Thousand Talents Plan
Young & Elite Talents Project},
organization = {China Manned Space
Project with No. CMS-CSST-2021-A08},
publisher = {IOP Publishing},
title = {KIC 8840638: A Newly Discovered Eclipsing Binary with δ Scuti–Type Oscillations},
doi = {10.3847/1538-4357/ad7841},
author = {Yang, Tao-Zhi and Zuo, Zhao-Yu and Liu, Jun-Hui and Jiang, Deng-Kai and Zhang, Zhi-Xiang and Tang, Qin-jie and García Hernández, Antonio},
}