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

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dc.contributor.authorYıldırım, Muhammed Faruk
dc.date.accessioned2026-02-03T11:50:26Z
dc.date.available2026-02-03T11:50:26Z
dc.date.issued2025
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe 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 M?/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.
dc.identifier.doi10.28979/jarnas.1746977
dc.identifier.endpage317
dc.identifier.issn2757-5195
dc.identifier.issue3
dc.identifier.startpage309
dc.identifier.trdizinid1356074
dc.identifier.urihttps://doi.org/10.28979/jarnas.1746977
dc.identifier.urihttps://search.trdizin.gov.tr/tr/yayin/detay/1356074
dc.identifier.urihttps://hdl.handle.net/20.500.12428/34121
dc.identifier.volume11
dc.indekslendigikaynakTR-Dizin
dc.institutionauthorYıldırım, Muhammed Faruk
dc.language.isoen
dc.relation.ispartofJournal of advanced research in natural and applied sciences (Online)
dc.relation.publicationcategoryMakale - Ulusal Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_TR_20260130
dc.subjectW UMa type systems
dc.subjectorbital period change
dc.subjectenergy and material transfer
dc.subjectHN UMa
dc.titleOrbital Period Variation of the Low Mass Ratio Contact Binary HN UMa: O–C Analysis Based on TESS, SuperWASP and Ground Data
dc.typeArticle

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