Eclipsing binary stars with a $\delta$ Scuti component

Abstract

Eclipsing binaries with a $\delta$ Sct component are powerful tools to derive the fundamental parameters and probe the internal structure of stars. In this study, spectral analysis of 6 primary $\delta$ Sct components in eclipsing binaries has been performed. Values of $T_{\mathrm{eff}}$, $v\sin i$, and metallicity for the stars have been derived from medium-resolution spectroscopy. Additionally, a revised list of $\delta$ Sct stars in eclipsing binaries is presented. In this list, we have only given the $\delta$ Sct stars in eclipsing binaries to show the effects of the secondary components and tidal-locking on the pulsations of primary $\delta$ Sct components. The stellar pulsation, atmospheric and fundamental parameters (e.g., mass, radius) of 92 $\delta$ Sct stars in eclipsing binaries have been gathered. Comparison of the properties of single and eclipsing binary member $\delta$ Sct stars has been made. We find that single $\delta$ Sct stars pulsate in longer periods and with higher amplitudes than the primary $\delta$ Sct components in eclipsing binaries. The $v\sin i$ of $\delta$ Sct components is found to be significantly lower than that of single $\delta$ Sct stars. Relationships between the pulsation periods, amplitudes, and stellar parameters in our list have been examined. Significant correlations between the pulsation periods and the orbital periods, $T_{\mathrm{eff}}$, $\log g$, radius, mass ratio, $v\sin i$, and the filling factor have been found.

19 pages, 16 figure, 3 tables

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