Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data

Muhammed Faruk Yıldırım

doi:10.28979/jarnas.1746977

Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data

Abstract

The orbital period (OP) variation of the low-mass ratio contact HN Ursae Majoris (UMa) stellar system has been studied in detail for the first time using data from the Transiting Exoplanet Survey Satellite (TESS) and the Super Wide-Angle Search for Planets (SuperWASP) as well as data collected from the literature. We focused on determining the eclipse times (ET) from the light curves (LC) and constructed the O–C diagram from these times. The results obtained indicate the presence of OP variations in the system, where the OP of HN UMa decreases, and this ratio is calculated as dP/dt = –1.74  10-7 days/year. Energy and material transfer from the more mass star to the less mass one was proposed as the reason for the OP decrease, and this ratio was obtained as 3.03  10-8 Mʘ/year. Furthermore, a sinusoidal variation was also observed, and it was hypothesized that a possible third object or magnetic activity could cause this variation. The Js/Jo ratio for HN UMa was calculated as 0.215, and the values of qins and ains were determined as 0.036 and 2.21, respectively. In light of these findings, it can be said that the HN UMa system remains stable for the time being. The findings are likely to contribute to the understanding of the evolutionary processes in low-mass ratio binary systems.

Keywords

References

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Details

Primary Language

English

Subjects

High Energy Astrophysics and Galactic Cosmic Rays

Journal Section

Research Article

Authors

Muhammed Faruk Yıldırım ^*
0000-0003-2382-7011
Türkiye

Early Pub Date

September 30, 2025

Publication Date

September 30, 2025

Submission Date

July 20, 2025

Acceptance Date

August 26, 2025

Published in Issue

Year 2025 Volume: 11 Number: 3

DOI

https://doi.org/10.28979/jarnas.1746977

IZ

https://izlik.org/JA22PC53NF

Cite

RIS / Bibtex

APA

Yıldırım, M. F. (2025). Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data. Journal of Advanced Research in Natural and Applied Sciences, 11(3), 309-317. https://doi.org/10.28979/jarnas.1746977

AMA

1.Yıldırım MF. Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data. JARNAS. 2025;11(3):309-317. doi:10.28979/jarnas.1746977

Chicago

Yıldırım, Muhammed Faruk. 2025. “Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data”. Journal of Advanced Research in Natural and Applied Sciences 11 (3): 309-17. https://doi.org/10.28979/jarnas.1746977.

EndNote

Yıldırım MF (September 1, 2025) Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data. Journal of Advanced Research in Natural and Applied Sciences 11 3 309–317.

IEEE

[1]M. F. Yıldırım, “Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data”, JARNAS, vol. 11, no. 3, pp. 309–317, Sept. 2025, doi: 10.28979/jarnas.1746977.

ISNAD

Yıldırım, Muhammed Faruk. “Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data”. Journal of Advanced Research in Natural and Applied Sciences 11/3 (September 1, 2025): 309-317. https://doi.org/10.28979/jarnas.1746977.

JAMA

1.Yıldırım MF. Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data. JARNAS. 2025;11:309–317.

MLA

Yıldırım, Muhammed Faruk. “Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data”. Journal of Advanced Research in Natural and Applied Sciences, vol. 11, no. 3, Sept. 2025, pp. 309-17, doi:10.28979/jarnas.1746977.

Vancouver

1.Muhammed Faruk Yıldırım. Orbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data. JARNAS. 2025 Sep. 1;11(3):309-17. doi:10.28979/jarnas.1746977

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