J/AJ/161/46 (O-C) curve of the binary system KIC 06852488 (Shi+, 2021)
Flaring and spot activities on the semi-detached binary system KIC 06852488.
Shi X.-D., Qian S.-B., Li L.-J., Liu N.-P.
<Astron. J., 161, 46 (2021)>
=2021AJ....161...46S 2021AJ....161...46S
ADC_Keywords: Stars, double and multiple; Optical; Photometry
Keywords: Close binary stars ; Eclipsing binary stars ;
Eclipsing binary minima timing method ; Pulsating variable stars
Abstract:
The continuous and unbroken time-series photometry data of Kepler and
the Transiting Exoplanet Survey Satellite (TESS) provide a good
opportunity to study the continuous variations in the light curve of
binary stars. This paper reports the discoveries of the correlation
between the two maxima on the light curve of KIC06852488 and the
correlation between the O'Connell effect and the O-C curve. The Max I
and Max II vary with a same cycle length of ∼2000days and a 180°
phase difference, and the variation of the Max II coincides with the
O-C curve of the primary light minima. After analyzing the Kepler and
TESS light curves, it is detected that this binary is a semi-detached
system with a mass ratio of 0.4622(±0.0036). The secondary
component is filling its critical Roche lobe, while the primary
component is only filling 12.25(±0.10)% of the lobe volume that
contributes more than 85% luminosity of the total system. The
variation of the O'Connell effect could be explained by an evolving
hot spot on the primary component and an evolving cool spot on the
secondary component. It is found that their positions are symmetrical
with the inner Lagrange L1 point. After subtracting the binary
brightness changes, six optical flares are detected that come from the
cool secondary. We calculated the energy of flares and found that all
of the flares are superflares. Both the flares and an evolving dark
spot on the lobe-filling secondary component make the system a very
interesting source to investigate the effects of binary interaction on
the magnetic activities.
Description:
For KIC06852488, the long-cadence (LC, with an interval of 29.42
minutes) light curves of 17 quarters (about 1600days) and the
short-cadence (SC, with an interval of 59s) light curves of 1 quarter
(about 25 days) were observed by Kepler. The simple aperture
photometry light curves were obtained from the Mikulski Archive for
Space Telescopes (MAST) database.
KIC06852488 was also observed by the Transiting Exoplanet Survey
Satellite (TESS) space mission from BJD 2458683 to 2458710 (about 27
days, with an interval of about 30 minutes).
To analyze the changes of the orbital period, we also collected
photometric data from SuperWASP.
Objects:
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RA (2000) DE Designation(s) (Period)
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19 13 53.56 +42 22 48.2 KIC 06852488 = KOI-6775 (P=2.171994d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 143 Eclipse times for KIC 06852488
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See also:
I/297 : NOMAD Catalog (Zacharias+ 2005)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/333/231 : O-M stars model atmospheres (Bessell+ 1998)
J/AJ/141/83 : Kepler Mission. I. Eclipsing binaries in DR1 (Prsa+, 2011)
J/AJ/142/160 : Kepler Mission. II. Eclipsing binaries in DR2 (Slawson+, 2011)
J/ApJS/209/5 : Superflares of Kepler stars. I. (Shibayama+, 2013)
J/AJ/151/68 : Kepler Mission. VII. Eclipsing binaries in DR3 (Kirk+, 2016)
J/ApJ/859/140 : Multi-band magnitudes for W UMa EB* candidates (Chen+, 2018)
J/ApJS/235/5 : EA-type eclipsing binaries observed by LAMOST (Qian+, 2018)
J/A+A/630/A106 : Stellar pulsators in the eclipsing binaries (Gaulme+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d Epoch [2454245/2458703] Heliocentric Julian Date of
Eclipse
15- 21 F7.5 d e_Epoch [0.0003/0.02] Uncertainty in Epoch
23- 28 F6.1 --- E [-338/1714] Number of the cycle
30- 38 F9.6 d (OC)1 [-0.03/0.03] O-C value calculated by equation 1
in text (1)
40- 48 F9.6 d (OC)2 [-0.02/0.03] O-C value calculated by equation 2 in
text (1)
50- 50 A1 --- Eclipse [PS] Eclipse, primary (68 occurrences) or secondary
(75 occurrences)
52- 60 A9 --- Tel Telescope used
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Note (1): Equation 1 : Min.I=2454979.96895+2.1720406xE
Equation 2 :
Min.I=2454979.97184(±0.00048)+2.17202886(±0.00000009)xE
See part 2 in the article for more details.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 08-Mar-2021