التفاصيل البيبلوغرافية
| العنوان: |
Asteroseismology of KIC 7107778: a binary comprising almost identical subgiants. |
| المؤلفون: |
Yaguang Li, Bedding, Timothy R., Li, Tanda, Bi, Shaolan, Murphy, Simon J., Corsaro, Enrico, Chen, Li, Tian, Zhijia |
| المصدر: |
Monthly Notices of the Royal Astronomical Society; May2018, Vol. 476 Issue 1, p470-481, 12p |
| مصطلحات موضوعية: |
SUBGIANT stars -- Atmospheres, BINARY stars, COSMOLOGICAL constant, DARK matter, TIME series analysis |
| مستخلص: |
We analyse an asteroseismic binary system: KIC 7107778, a non-eclipsing, unresolved target, with solar-like oscillations in both components. We used Kepler short cadence time series spanning nearly 2 yr to obtain the power spectrum. Oscillation mode parameters were determined using Bayesian inference and a nested sampling Monte Carlo algorithm with the DIAMONDS package. The power profiles of the two components fully overlap, indicating their close similarity. We modelled the two stars with MESA and calculated oscillation frequencies with GYRE. Stellar fundamental parameters (mass, radius, and age) were estimated by grid modelling with atmospheric parameters and the oscillation frequencies of l = 0, 2 modes as constraints. Most l = 1 mixed modes were identified with models searched using a bisection method. Stellar parameters for the two sub-giant stars are MA = 1.42 ± 0.06 M, MB = 1.39 ± 0.03 M⊙, RA = 2.93 ± 0.05 R⊙, RB = 2.76 ± 0.04 R⊙, tA = 3.32 ± 0.54 Gyr and tB = 3.51 ± 0.33 Gyr. The mass difference of the system is ~1 per cent. The results confirm their simultaneous birth and evolution, as is expected from binary formation. KIC 7107778 comprises almost identical twins, and is the first asteroseismic sub-giant binary to be detected. [ABSTRACT FROM AUTHOR] |
|
Copyright of Monthly Notices of the Royal Astronomical Society is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder