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HD 183648: a Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component

Borkovits, T. and Derekas, A. and Fuller, J. and Szabó, Gy. M. and Pavlovski, K. and Csák, B. and Dózsa, Á. and Kovács, J. and Szabó, R. and Hambleton, K. M. and Kinemuchi, K. and Kolbas, V. and Kurtz, D. W. and Maloney, F. and Prša, A. and Southworth, J. and Sztakovics, J. and Bíró, I. B. and Jankovics, I. (2014) HD 183648: a Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component. Monthly Notices of the Royal Astronomical Society, 443 (4). pp. 3068-3081. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20190425-152212690

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Abstract

KIC 8560861 (HD 183648) is a marginally eccentric (e = 0.05) eclipsing binary with an orbital period of P_(orb) = 31.973 d, exhibiting mmag amplitude pulsations on time-scales of a few days. We present the results of the complex analysis of high- and medium-resolution spectroscopic data and Kepler Q0 – Q16 long cadence photometry. The iterative combination of spectral disentangling, atmospheric analysis, radial velocity and eclipse timing variation studies, separation of pulsational features of the light curve, and binary light curve analysis led to the accurate determination of the fundamental stellar parameters. We found that the binary is composed of two main-sequence stars with an age of 0.9 ± 0.2 Gyr, having masses, radii and temperatures of M_1 = 1.93 ± 0.12 M_⊙, R_1 = 3.30 ± 0.07 R_⊙, T_(eff1) = 7650 ± 100 K for the primary, and M_2 = 1.06 ± 0.08 M_⊙, R_2 = 1.11 ± 0.03 R_⊙, T_(eff2) = 6450 ± 100 K for the secondary. After substracting the binary model, we found three independent frequencies, two of which are separated by twice the orbital frequency. We also found an enigmatic half orbital period sinusoidal variation that we attribute to an anomalous ellipsoidal effect. Both of these observations indicate that tidal effects are strongly influencing the luminosity variations of HD 183648. The analysis of the eclipse timing variations revealed both a parabolic trend, and apsidal motion with a period of P^(obs)_(apse) = 10400 ± 3000 y, which is ten times faster than what is theoretically expected. These findings might indicate the presence of a distant, unseen companion.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stu1379DOIArticle
https://arxiv.org/abs/1407.1788arXivDiscussion Paper
ORCID:
AuthorORCID
Borkovits, T.0000-0002-8806-496X
Fuller, J.0000-0002-4544-0750
Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 July 6. Received 2014 July 6; in original form 2014 May 29. This project has been supported by the Hungarian OTKA Grant K83790, ESA PECS Contract No. 4000110889/14/NL/NDe, the Lendület-2009 Young Researchers Programme of the Hungarian Academy of Sciences and the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 269194 (IRSES/ASK) and no. 312844 (SPACEINN). AD, RSz and GyMSz have been supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. TB, BCs, JK and GyMSz would like to thank City of Szombathely for support under Agreement No. S-11-1027. This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission directorate. Based on observations obtained with the APO 3.5-m telescope, which is owned and operated by the Astrophysical Research Consortium. The authors wish to tank Dr. Gregory Feiden for calling their attention for a numerical error in an earlier version of the manuscript.
Funders:
Funding AgencyGrant Number
Hungarian Scientific Research Fund (OTKA)K83790
European Space Agency (ESA)4000110889/14/NL/NDe
Hungarian Academy of SciencesLendület-2009
European Research Council (ERC)269194
European Research Council (ERC)312844 (SPACEINN)
City of SzombathelyS-11-1027
NASAUNSPECIFIED
Subject Keywords:binaries: eclipsing, stars: fundamental parameters, stars: individual: HD 183648, stars: oscillations
Issue or Number:4
Record Number:CaltechAUTHORS:20190425-152212690
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190425-152212690
Official Citation:T. Borkovits, A. Derekas, J. Fuller, Gy. M. Szabó, K. Pavlovski, B. Csák, Á. Dózsa, J. Kovács, R. Szabó, K. M. Hambleton, K. Kinemuchi, V. Kolbas, D. W. Kurtz, F. Maloney, A. Prša, J. Southworth, J. Sztakovics, I. B. Bíró, I. Jankovics, HD 183648: a Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component, Monthly Notices of the Royal Astronomical Society, Volume 443, Issue 4, 1 October 2014, Pages 3068–3081, https://doi.org/10.1093/mnras/stu1379
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94987
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:26 Apr 2019 14:54
Last Modified:03 Oct 2019 21:09

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