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Journals / Turkish Journal of Astronomy and Astrophysics / 2026 / Cilt: 7

Common Age and Initial Metallicity for the 16 Cyg Binary System

16 Cyg Çift Sistemi için Ortak Yaş ve Başlangıç ​​Metaliklik Değeri

Asya Demirkol(EGE ÜNİVERSİTESİ, FEN BİLİMLERİ ENSTİTÜSÜ, ASTROFİZİK (YL) (TEZLİ))0009-0005-5090-7975
Mutlu Yıldız(EGE ÜNİVERSİTESİ, FEN FAKÜLTESİ, ASTRONOMİ PR.)0000-0002-7772-7641
Sibel Örtel(EGE ÜNİVERSİTESİ, FEN BİLİMLERİ ENSTİTÜSÜ)0000-0001-5759-7790
Tuğbanur Çakır Alsaç(EGE ÜNİVERSİTESİ, FEN BİLİMLERİ ENSTİTÜSÜ, ASTROFİZİK (DR))0000-0002-2538-0105
Pages
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Publication Date
2026-09-10
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The surface metallicities are Zs = 0.01390 and Zs = 0.01404 for 16 Cyg A and B, respectively, showing consistency with the expected effects of microscopic diffusion.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Solar-like oscillating binary systems provide powerful constraints on stellar evolution, as their components are expected to share the same initial chemical composition and age due to their common origin.
📊
Key Findings & Data:The 16 Cyg system, whose components are both solar analogues and show solar-like oscillations, represents an excellent laboratory in this context.
💡
Conclusion & Impact:The surface metallicities are Zs = 0.01390 and Zs = 0.01404 for 16 Cyg A and B, respectively, showing consistency with the expected effects of microscopic diffusion.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:asteroseismology · binary star evolution: 16 Cyg · stellar evolution

Abstract

Solar-like oscillating binary systems provide powerful constraints on stellar evolution, as their components are expected to share the same initial chemical composition and age due to their common origin. Asteroseismology further allows these parameters to be determined with high precision. The 16 Cyg system, whose components are both solar analogues and show solar-like oscillations, represents an excellent laboratory in this context. In this study, we constructed stellar models of 16 Cyg A and B using the MESA evolutionary code under the spectroscopic and interferometric constraints. We found a common age of t ≈ 8.0 Gyr for an initial metallicity of Z0 = 0.0166. The masses of the components are MA = 1.000 M⊙ and MB = 0.971 M⊙. The models agree well with the interferometric radii, observed effective temperatures, and luminosities. The surface metallicities are Zs = 0.01390 and Zs = 0.01404 for 16 Cyg A and B, respectively, showing consistency with the expected effects of microscopic diffusion.

Özet

Güneş benzeri titreşim yapan çift sistemler, bileşenlerinin ortak kökenlerinden dolayı aynı başlangıç kimyasal bileşimine ve yaşa sahip olmalarının beklenmesi nedeniyle, yıldız evrimi üzerinde güçlü kısıtlamalar sağlar. Asterosismoloji ise bu parametrelerin yüksek hassasiyetle belirlenmesine olanak tanır. Bileşenlerinin her ikisi de güneş analoğu olan ve güneş benzeri titreşim gösteren 16 Cyg sistemi, bu bağlamda mükemmel bir laboratuvar oluşturmaktadır. Bu çalışmada, 16 Cyg A ve B’nin iç yapı modelleri, spektroskopik ve interferometrik kısıtlamalar altında MESA evrim kodu kullanılarak oluşturulmuştur. Başlangıç metal bolluğu Z0 = 0.0166 için ortak yaşın yaklaşık t≈8.0 Gyr olduğu bulunmuştur. Bileşenlerin kütleleri sırasıyla MA = 1.000 M⊙ ve MB = 0.971 M⊙ olarak elde edilmiştir. Modeller, interferometrik yarıçap, gözlemsel etkin sıcaklık ve ışıtma değerleri ile iyi bir uyum göstermektedir. Yüzey metal bollukları ise sırasıyla 16 Cyg A ve B için Zs = 0.01390 ve Zs = 0.01404 olup mikroskobik difüzyonun beklenen etkileriyle tutarlılık göstermektedir.

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Cite This Article

Demirkol, A., Yıldız, M., Örtel, S., Alsaç, T. Ç. (2026). Common Age and Initial Metallicity for the 16 Cyg Binary System. Turkish Journal of Astronomy and Astrophysics, Cilt: 7. https://doi.org/10.55064/tjaa.1952375

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