Photometric, Spectroscopic and Orbital Period Study of Three Early Type Semi-detached Systems: XZ Aql, UX Her and AT Peg

TL;DR

This study combines photometric, spectroscopic, and orbital period analyses to determine the properties and evolutionary states of three early-type semi-detached eclipsing binaries, revealing cyclic orbital variations and potential pulsations.

Contribution

It provides new absolute parameters, evolutionary insights, and evidence of pulsational behavior in one system, enhancing understanding of early-type binary evolution.

Findings

All three systems show cyclic orbital changes.

XZ Aql likely hosts a δ Scuti pulsator.

Derived absolute parameters and evolutionary states.

Abstract

In this paper we present a combined photometric, spectroscopic and orbital period study of three early-type eclipsing binary systems: XZ Aql, UX Her, and AT Peg. As a result, we have derived the absolute parameters of their components and, on that basis, we discuss their evolutionary states. Furthermore, we compare their parameters with those of other binary systems and with the theoretical models. An analysis of all available up-to-date times of minima indicated that all three systems studied here show cyclic orbital changes, their origin is discussed in detail. Finally, we performed a frequency analysis for possible pulsational behavior and as a result we suggest that XZ Aql hosts a {\delta} Scuti component.