The period analysis of V418 Aql, SU Boo, RV CVn, CR Cas, GV Cyg, V432 Per, and BD+42 2782

TL;DR

This study analyzed eclipse timings of seven binary star systems, revealing periodic variations likely caused by third bodies, and provided new physical parameters and variable star discoveries.

Contribution

The paper presents long-term period analysis of multiple eclipsing binaries, proposing third-body hypotheses and deriving new physical parameters and variable stars.

Findings

Periodic variations with orbital periods of 7.4 to 70 years were identified.

New times of minima totaling 576 were derived.

Additional 9.5-year variation was found in V432 Per.

Abstract

The minimum timings of eclipsing binaries V418 Aql, SU Boo, RV CVn, CR Cas, GV Cyg, V432 Per, and BD+42 2782 were collected and analyzed. Their long-term behavior was studied via period analysis, revealing a periodic term in eclipse times. We derived 576 new times of minimum. Hence, to describe the periodic variation, a thirdbody hypothesis was proposed and the resulting orbital periods are as follows: 70, 7.4, 53, 37, 27, 53, and 18 yr, respectively. For the system V432 Per an additional 9.5 yr variation was also found. The predicted minimum masses of these distant bodies were calculated and their detectability discussed. The light curves of SU Boo and RV CVn were analyzed using the PHOEBE program, resulting in physical parameters of the components. New variable stars in the field of V418 Aql were discovered.