Eclipsing binary stars with a $δ$ Scuti component

Abstract

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

19 pages, 16 figure, 3 tables