CAOSP abstracts, Volume: 52, No.: 2, year: 2022

Author(s): Zengin Çamurdan, D.; Özkardeş, B.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 52, no. 2, p. 5-24.
Date: 09/2022
Title: Detection of a cyclic period change in the contact binary TU UMi
Keyword(s): Stars: binaries: eclipsing; Stars: Individual TU UMi
Object(s): TU UMi
Pages: 5 -- 24
DOI: https://doi.org/10.31577/caosp.2022.52.2.5
NASA ADS Abstract Service: 2022CoSka..52b...5Z
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: This study aims at timing the eclipses of the binary star TU UMi. The times of minima are taken from the literature, from our observations in April 2004 and from TESS observations between 2019 and 2022. The orbital period analysis of the system indicates that there is a cyclic oscillation with an amplitude of 0.0081d and a period of 9.03 yr, accompanied by a continuous decrease at a rate of dP/dt = -1.12 × 10^-7 d yr^-1. We study the secular evolution of the orbital period of the system and the possibility of the existence of a third companion or the magnetic activity cycle of the primary component in the system.