Astrophys. J., 835, 189-189 (2017/February-1)
KIC 11401845: an eclipsing binary with multiperiodic pulsations and light-travel time.
LEE J.W., HONG K., KIM S.-L. and KOO J.-R.
Abstract (from CDS):
We report the Kepler photometry of KIC 11401845 displaying multiperiodic pulsations, superimposed on binary effects. Light-curve synthesis shows that the binary star is a short-period detached system with a very low mass ratio of q = 0.070 and filling factors of F1 = 45% and F2 = 99%. Multiple-frequency analyses were applied to the light residuals after subtracting the synthetic eclipsing curve from the observed data. We detected 23 frequencies with signal-to-noise ratios larger than 4.0, of which the orbital harmonics (f4, f6, f9, f15) in the low-frequency domain may originate from tidally excited modes. For the high frequencies of 13.7-23.8 day–1, the period ratios and pulsation constants are in the ranges of Ppul/Porb=0.020–0.034 and Q = 0.018-0.031 days, respectively. These values and the position on the Hertzsprung-Russell diagram demonstrate that the primary component is a δ Sct pulsating star. We examined the eclipse timing variation of KIC 11401845 from the pulsation-subtracted data and found a delay of 56 ± 17 s in the arrival times of the secondary eclipses relative to the primary eclipses. A possible explanation of the time shift may be some combination of a light-travel-time delay of about 34 s and a very small eccentricity of ecosω0.0002. This result represents the first measurement of the Romer delay in noncompact binaries.
© 2017. The American Astronomical Society. All rights reserved.
binaries: eclipsing - stars: fundamental parameters - stars: individual: KIC 11401845 - stars: oscillations including pulsations - stars: oscillations including pulsations
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<Available at CDS (J/ApJ/835/189): table3.dat>
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