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• W2059443456 abstract "The candidate SX Phe star KIC 11754974 shows a remarkably high number of combination frequencies in the Fourier amplitude spectrum: 123 of the 166 frequencies in our multi-frequency fit are linear combinations of independent modes. Predictable patterns in frequency spacings are seen in the Fourier transform of the light curve. We present an analysis of 180 d of short-cadence Kepler photometry and of new spectroscopic data for this evolved, late A-type star. We infer from the 1150-d, long-cadence light curve, and in two different ways, that our target is the primary of a 343-d, non-eclipsing binary system. According to both methods, the mass function is similar, f(M)=0.0207 +/- 0.0003 Msun. The observed pulsations are modelled extensively, using separate, state-of-the-art, time-dependent convection (TDC) and rotating models. The models match the observed temperature and low metallicity, finding a mass of 1.50-1.56 Msun. The models suggest the whole star is metal-poor, and that the low metallicity is not just a surface abundance peculiarity. This is the best frequency analysis of an SX Phe star, and the only Kepler delta Sct star to be modelled with both TDC and rotating models." @default.
• W2059443456 created "2016-06-24" @default.
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• W2059443456 date "2013-05-10" @default.
• W2059443456 modified "2023-10-17" @default.
• W2059443456 title "Asteroseismology of KIC 11754974: a high-amplitude SX Phe pulsator in a 343-d binary system" @default.
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• W2059443456 doi "https://doi.org/10.1093/mnras/stt587" @default.
• W2059443456 hasPublicationYear "2013" @default.
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