• Title/Summary/Keyword: BOO

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Absolute Dimension and Pulsational Characteristics of the Eclipsing Binary EW Boo with a δ Sct Pulsator

  • Kim, Hye-Young;Hong, Kyeongsoo;Kim, Chun-Hwey;Lee, Jae Woo;Jeong, Min-Ji;Park, Jang-Ho;Song, Mi-Hwa
    • The Bulletin of The Korean Astronomical Society
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    • v.46 no.1
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    • pp.34.4-35
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    • 2021

  • We present the TESS photometry and our high-resolution spectra of the semi-detached Algol EW Boo. For an orbital period study, we collected all available times of minima including ours for the last 30 years. It is found that the eclipse timing variation of the system can be represented by a periodic oscillation of 18.5±1.0 yr plus a secular period increase with a rate of [dP/dt]orb=-6(±3)×10-8 d yr-1. From our observed spectra, the effective temperature of the primary star was determined to be Teff,1=8560±118 K. From a simultaneous analysis of the TESS light and our double-lined radial velocity curves, the absolute masses, radii, and luminosities are M1=2.30±0.07M⊙, M2=0.38±0.01M⊙, R1=1.92±0.02 R⊙, R2=1.27±0.01 R⊙, L1=1.92±0.02 L⊙, and L2=0.752±0.007 L⊙, respectively. Multiple frequency analyses were carried out for the light residuals after subtracting the binary star model. We detected a total of 75 frequencies in the region of 16.50-104.8 day-1. Our results demonstrate that the more hotter primary star of EW Boo is a δ Sct pulsator by considering its position in the δ Scuti region of the Cepheid instability strip and pulsational characteristics.

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