J/ApJ/835/189 KIC 11401845 eclipse timings (Lee+, 2017)
KIC 11401845: an eclipsing binary with multiperiodic pulsations and
light-travel time.
Lee J.W., Hong K., Kim S.-L., Koo J.-R.
<Astrophys. J., 835, 189-189 (2017)>
=2017ApJ...835..189L 2017ApJ...835..189L (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry
Keywords: binaries: eclipsing; stars: fundamental parameters;
stars: individual: KIC 11401845;
stars: oscillations including pulsations
Abstract:
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 13.7-23.8day-1, the period ratios
and pulsation constants are in the ranges of Ppul/Porb=0.020-0.034
and Q=0.018-0.031days, 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±17s 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
34s and a very small eccentricity of e.cosω<0.0002. This result
represents the first measurement of the Romer delay in noncompact
binaries.
Description:
The Kepler data of KIC 11401845 were obtained in a long-cadence mode
of 29.42 minutes during Quarters 10 (Jun-Aug 2011) and 12 (Jan-Mar
2012).
Objects:
--------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
--------------------------------------------------------------------
19 25 11.28 +49 14 40.1 KIC 11401845 = KIC 11401845 (P=2.1613)
--------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 72 150 Eclipse timings measured from both datasets
including and removing the pulsations
--------------------------------------------------------------------------------
See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/MNRAS/373/435 : Angular momentum evolution of Algol binaries
(Ibanoglu+, 2006)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/ApJ/753/101 : Kepler eclipse timings of KIC 9472174 (Barlow+, 2012)
J/A+A/557/A79 : Spectra of KIC10661783 (Lehmann+, 2013)
J/AJ/147/104 : Photometry and velocities of 1SWASP J093010A and B (Koo+, 2014)
J/AJ/148/37 : Long-term photometric behavior of V404 Lyr (Lee+, 2014)
J/ApJ/812/46 : Transit metric for Q1-Q17 Kepler candidates (Thompson+, 2015)
J/AJ/151/68 : Kepler Mission. VII. Eclipsing binaries in DR3 (Kirk+, 2016)
J/ApJ/833/170 : Spots parameters for LCs of the EB star KIC 6048106 (Lee, 2016)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d O-BJD Observed Barycentric Julian Date
15- 21 F7.5 d e_O-BJD [0.0001/0.003] Error in O-BJD
23- 31 F9.6 d O-(O-C1) [-0.0009/0.002] The (O-C) residual for observed
data
33- 37 F5.1 --- Epoch Epoch
39- 40 A2 --- Min Minimum type ("I": orbital phase 0.0 or
"II": orbital phase 0.5)
42- 54 F13.5 d PS-BJD Pulsation-Subtracted Barycentric Julian Date
56- 62 F7.5 d e_PS-BJD [0.0001/0.0008] Error in PS-BJD
64- 72 F9.6 d PS-(O-C2) [-0.0008/0.0008] The (O-C) residual for
Pulsation-Subtracted data
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 31-Aug-2017