Analysis of TESS field eclipsing binary star V948 Her: a pulsating or non-pulsating star?

Abstract

Pulsating stars occupy a significant place in the H-R diagram and it was thought that all stars inside the classical instability strip should pulsate. However, recent studies showed that there are many non-pulsating stars placed inside the classical instability strip. The existence of these non-pulsating stars is still a mystery. To deeply understand the properties of these non-pulsating and pulsating stars, one needs precise fundamental stellar parameters (e.g mass). For this purpose, the eclipsing binaries are unique systems. Hence, in this study, we present the TESS data analysis of one candidate pulsating eclipsing binary system V948\,Her. TESS data were used for the binary modelling with the literature radial velocity measurements and the precise fundamental parameters of the system were obtained. The system's age was derived as 1$\pm$0.24 Gyr. The positions of the binary components in the H-R diagram were examined and the primary component was found inside the $\delta$\,Scuti instability strip. However, in the frequency analysis of TESS data, we found no significant pulsation frequencies. Only the harmonics of the orbital periods were obtained in the analysis. Therefore, the system was classified as a non-pulsator. V948\,Her is an important object to understand the nature of non-pulsating stars inside the $\delta$\,Scuti instability strip.

accepted for publication by RAA, supported by the Scientific and Technological Research Council (TUBITAK) project through 120F330

References in corpus (10)

• Modules for Experiments in Stellar Astrophysics (MESA)
• The first WASP public data release
• {\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip
• The role of turbulent pressure as a coherent pulsational driving mechanism: the case of the delta Scuti star HD 187547
• Period changes in six contact binaries: WZ And, V803 Aql, DF Hya, PY Lyr, FZ Ori, and AH Tau
• Empirical Bolometric Correction Coefficients for Nearby Main-Sequence Stars in Gaia Era
• The Catalogue of Stellar Parameters from the Detached Double-Lined Eclipsing Binaries in the Milky Way
• A search for non-pulsating, chemically normal stars in the $\delta$ Scuti instability strip using Kepler data
• A photometric study of the neglected eclipsing binaries: V405 Cep, V948 Her, KR Mon and UZ Sge
• Doppler-beaming in the Kepler light curve of LHS 6343 A

Cited by in corpus (1)

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