Light Curve and orbital period analysis of the eclipsing binary AT Peg

TL;DR

This study presents CCD photometry, light curve analysis, and orbital period investigation of the eclipsing binary AT Peg, revealing period modulations possibly due to Light-Time effect and secular changes, enhancing understanding of its orbital dynamics.

Contribution

The paper provides new photometric data, modern light curve analysis, and a comprehensive orbital period study of AT Peg, incorporating the latest minima timings and discussing period variations.

Findings

Detected period modulations consistent with Light-Time effect

Identified secular changes in the orbital period

Derived new geometric and photometric parameters

Abstract

CCD photometric observations of the Algol-type eclipsing binary AT Peg have been obtained. The light curves are analyzed with modern techniques and new geometric and photometric elements are derived. A new orbital period analysis of the system, based on the most reliable timings of minima found in the literature, is presented and apparent period modulations are discussed with respect to the Light-Time effect (LITE) and secular changes in the system. The results of these analyses are compared and interpreted in order to obtain a coherent view of the system's behaviour.