Abstract:
Eclipsing binary systems with a Delta (δ) Scuti component serve a vital role in
deriving precise fundamental stellar parameters and testing stellar evolution
models. This study mainly focuses on the Kepler target KIC 8569819, a detached
eclipsing binary system that consists of a δ Scuti pulsating component. The
quarter 9 photometric data observed by the Kepler mission were used for the
analysis. The binary nature of the KIC 8569819 system was modeled using the
Wilson-Devinney (WD) code and extracted new set of stellar parameters. This
comprehensive study mainly focuses on the application of the Differential
Correction (DC2015) process after the initial fitting done by the Light Curve
modeling (LC2015) process for the disentanglement of the binary nature from the
observed light curve. Subsequently, an improved set of stellar parameters for both
primary and secondary components of the KIC 8569819 system was determined.
The DC2015 modeling process yielded an orbital inclination of i = 89.88 ±
0.03 degrees, primary component luminosity L = 10.911± 0.005 L⨀, the
effective temperature of the primary component of Teff,1 = 7155 ± 9 K and the
effective temperature of the secondary component of Teff,2 = 5956 ± 7 K.
Additionally, the values for the radius 1.790 R⨀ and 0.986 R⨀, bolometric
magnitude 2.56 mag and 4.65 mag, and surface gravity 4.17 cm s−2 and
4.46 cm s−2, were found as refined stellar parameters for both primary and
secondary components of the KIC 8569819 binary system respectively. These
results not only deliver an updated and highly accurate stellar model for KIC
8569819 but also provide reliable input for the future analysis of mode
identification of pulsation frequencies in the field of Asteroseismology.
