Comprehensive study of five candidate delta Scuti-type pulsators in detached eclipsing binaries

TL;DR

This study conducts detailed photometric and spectroscopic analysis of five candidate delta Scuti pulsators in detached eclipsing binaries, improving stellar parameter accuracy and exploring pulsation origins, including tidal effects.

Contribution

It provides the first comprehensive analysis of these pulsators with precise stellar parameters, expanding the sample for asteroseismic studies and identifying tidal influences on pulsations.

Findings

High-accuracy stellar masses and radii were obtained.

Tidal effects cause amplitude variations in pulsation frequencies.

The pulsators' ages were estimated and compared with theoretical models.

Abstract

Pulsating stars in eclipsing binaries (EBs) provide an excellent opportunity to obtain precise, model-independent stellar parameters for studying oscillations in detail. One common class of pulsators in these EBs exhibits delta Scuti-type oscillations. Characterising these pulsators using the precise parameters obtained from EB modelling enhances our understanding of such stars and strengthens asteroseismic studies. We conducted a comprehensive photometric and spectroscopic analysis of candidate pulsators in detached EBs to expand the sample of systems with accurately determined absolute parameters. We performed radial velocity and light curve modelling to estimate the absolute stellar parameters, along with detailed spectroscopic modelling to obtain global metallicity and temperatures. Frequency power spectra were derived from the residuals of binary modelling. Isochrones were used to determine the stars' ages, which were then compared to theoretically obtained values. We present a detailed analysis of four candidate delta Scuti-type pulsators in EBs and update the light curve analysis of the previously studied system TIC 308953703. The masses and radii of the components are constrained with high accuracy, aiding in age estimation. We perform a Fourier analysis of the observed oscillations and explore their origin. For TIC 81702112, we report tidal effects causing amplitude variation in the oscillation frequencies over the orbital phase.