Analysis of apsidal motion in eclipsing binaries using TESS data II. A test of internal stellar structure}

TL;DR

This study measures apsidal motion in 27 eclipsing binaries using TESS data to empirically test and confirm models of internal stellar structure, with results aligning closely with theoretical predictions.

Contribution

It provides precise empirical measurements of stellar internal density concentration, validating and refining theoretical models of stellar structure.

Findings

Good agreement between observed and theoretical internal stellar density parameters.

Small deviations observed but within measurement uncertainties.

Method demonstrates the effectiveness of TESS data in stellar internal structure analysis.

Abstract

We have determined the apsidal motion rate of 27 double-lined eclipsing binaries with precise physical parameters. The obtained values, corrected for their relativistic contribution, yield precise empirical parameters of the internal stellar density concentration. The comparison of these results with the predictions based on new theoretical models shows very good agreement. Small deviations are identified but remain within the observational uncertainties and the path for a refined comparison is indicated.