BD UMi: Eccentric detached binary with 𝛾 Doradus type component

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Gürol B.

NEW ASTRONOMY, cilt.107, ss.1-13, 2024 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 107
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1016/j.newast.2023.102161
  • Dergi Adı: NEW ASTRONOMY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1-13
  • Ankara Üniversitesi Adresli: Evet

Özet

BD UMi is an Algol-type eccentric eclipsing binary with one of the components showing 𝛾 Doradus type

pulsation. In this study we used the Transiting Exoplanet Survey Satellite (TESS) observations of the BD UMi

system published in total of 16 sectors. We obtained the minima times of the eclipsing system and refined

new light elements by using (𝑂 − 𝐶) technique. Out-of-eclipse variation related to the pulsation was analysed

in the frequency domain and g-mode pulsations were detected at frequencies < 2𝑑−1. We analysed the light

curve of the system and obtained the physical and geometrical parameters of the components by using the

well-known Wilson–Devinney code.

We found that the amplitude and frequency of the pulsation are variable and obtained three significant

frequency as 𝑓1 = 0.588𝑑−1, 𝑓2 = 0.746𝑑−1, and 𝑓3 = 0.140𝑑−1 which can be used as mean frequencies of the

pulsator.

We found that the primary component is a 𝛾 Doradus type star. In this work the BD UMi system has been

analysed in detail for the first time and we obtained masses and radii of the primary and secondary components

as 𝑀1 = 1.743 ± 0.011𝑀⊙, 𝑀2 = 1.734 ± 0.014𝑀⊙ and 𝑅1 = 1.937 ± 0.004𝑅⊙, 𝑅2 = 1.266 ± 0.002𝑅⊙,

respectively.