Work

Period Variation Rates of Four Radial Single-Mode High-Amplitude Delta Scuti Stars

Year: 2025

Type: article

Abstract: In this work, we present a study on the long time-scale period variations of four single-mode high-amplitude delta Scuti stars (HADS) via the classical O−C analysis. The target HADS are (i) XX Cygni, (ii) YZ Bootis, (iii) GP Andromedae, and (iv) ZZ Microscopii. The newly determined times of maximum light came from the Transiting Exoplanet Survey Satellite (TESS), American Association of Variable Star Observers (AAVSO), and Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne (BAV) projects. Together with the times of maximum light obtained in the historical literature, the O−C analysis was performed on these HADS, in which we obtained the linear period variation rates P˙/P as (9.2±0.2)×10−9yr−1, (3.2±0.2)×10−9yr−1, (4.22±0.03)×10−8yr−1, and (−2.06±0.02)×10−8yr−1, respectively. Based on these results and some earlier research, we also discuss the evolutionary stages and the mechanisms of the period variation of these four HADS.

Source: Universe

DOI: 10.3390/universe11030086

Authors: Tian-Fang Ma, Jia-Shu Niu, Hui-Fang Xue

Institutions: Shanxi University, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Taiyuan Normal University

Language: English

Topic: Stellar, planetary, and galactic studies

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,930

Funder: National Natural Science Foundation of China