Please use this identifier to cite or link to this item:
Title: The anticorrelated nature of the primary and secondary eclipse timing variations for the kepler contact binaries
Authors: Tran, K.
Levine, A.
Rappaport, S.
Borkovits, T.
Csizmadia, Sz.
Kalomeni, Belinda
Keywords: Stars
Kepler archive
Publisher: IOP Publishing Ltd.
Source: Tran, K., Levine, A., Rappaport, S., Borkovits, T., Csizmadia, S.,and Kalomeni, B. (2013). The anticorrelated nature of the primary and secondary eclipse timing variations for the kepler contact binaries. Astrophysical Journal, 774(1). doi:10.1088/0004-637X/774/1/81
Abstract: We report a study of the eclipse timing variations in contact binary systems, using long-cadence lightcurves from the Kepler archive. As a first step, observed minus calculated (O-C) curves were produced for both the primary and secondary eclipses of some 2000 Kepler binaries. We find ∼390 short-period binaries with O-C curves that exhibit (1) random walk-like variations or quasi-periodicities, with typical amplitudes of ±200-300 s, and (2) anticorrelations between the primary and secondary eclipse timing variations. We present a detailed analysis and results for 32 of these binaries with orbital periods in the range of 0.35 ± 0.05 days. The anticorrelations observed in their O-C curves cannot be explained by a model involving mass transfer, which, among other things, requires implausibly high rates of ∼0.01 MȮ yr-1. We show that the anticorrelated behavior, the amplitude of the O-C delays, and the overall random walk-like behavior can be explained by the presence of a starspot that is continuously visible around the orbit and slowly changes its longitude on timescales of weeks to months. The quasi-periods of ∼50-200 days observed in the O-C curves suggest values for k, the coefficient of the latitude dependence of the stellar differential rotation, of ∼0.003-0.013.
ISSN: 0004-637X
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Files in This Item:
File Description SizeFormat 
5162.pdfMakale1.93 MBAdobe PDFThumbnail
Show full item record

CORE Recommender


checked on Jul 19, 2024


checked on Jul 19, 2024

Page view(s)

checked on Jul 15, 2024


checked on Jul 15, 2024

Google ScholarTM



Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.