HD 183648

A Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component

T. Borkovits, A. Derekas, J. Fuller, Gy M. Szabó, K. Pavlovski, B. Csák, A. 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

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

KIC 8560861 (HD 183648) is a marginally eccentric (e = 0.05) eclipsing binary with an orbital period of Porb = 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 M1 = 1.93 ± 0.12 M⊙, R1 = 3.30 ± 0.07 R⊙, Teff1 = 7650 ± 100K for the primary, and M2 = 1.06 ± 0.08 M⊙, R2 = 1.11 ± 0.03 R⊙, Teff2 = 6450 ± 100K 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 Pobs apse = 10 400 ± 3 000y, which is ten times faster than what is theoretically expected. These findings might indicate the presence of a distant, unseen companion.

Original languageEnglish
Pages (from-to)3068-3081
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume443
Issue number4
DOIs
Publication statusPublished - 2014

Fingerprint

eclipses
orbitals
light curve
time measurement
main sequence stars
eccentrics
radial velocity
photometry
luminosity
timescale
trends
radii
analysis
temperature
effect
trend
parameter

Keywords

  • Binaries: eclipsing
  • Stars: fundamental parameters
  • Stars: individual: HD 183648
  • Stars: oscillations

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

HD 183648 : A Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component. / Borkovits, T.; Derekas, A.; Fuller, J.; Szabó, Gy M.; Pavlovski, K.; Csák, B.; Dózsa, A.; Kovács, J.; Szabó, R.; Hambleton, K. M.; Kinemuchi, K.; Kolbas, V.; Kurtz, D. W.; Maloney, F.; Prša, A.; Southworth, J.; Sztakovics, J.; Bíró, I. B.; Jankovics, I.

In: Monthly Notices of the Royal Astronomical Society, Vol. 443, No. 4, 2014, p. 3068-3081.

Research output: Contribution to journalArticle

Borkovits, T, Derekas, A, Fuller, J, Szabó, GM, Pavlovski, K, Csák, B, Dózsa, A, Kovács, J, Szabó, R, Hambleton, KM, Kinemuchi, K, Kolbas, V, Kurtz, DW, Maloney, F, Prša, A, Southworth, J, Sztakovics, J, Bíró, IB & Jankovics, I 2014, 'HD 183648: A Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component', Monthly Notices of the Royal Astronomical Society, vol. 443, no. 4, pp. 3068-3081. https://doi.org/10.1093/mnras/stu1379
Borkovits, T. ; Derekas, A. ; Fuller, J. ; Szabó, Gy M. ; Pavlovski, K. ; Csák, B. ; Dózsa, A. ; Kovács, J. ; Szabó, R. ; Hambleton, K. M. ; Kinemuchi, K. ; Kolbas, V. ; Kurtz, D. W. ; Maloney, F. ; Prša, A. ; Southworth, J. ; Sztakovics, J. ; Bíró, I. B. ; Jankovics, I. / HD 183648 : A Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 443, No. 4. pp. 3068-3081.
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AU - Szabó, Gy M.

AU - Pavlovski, K.

AU - Csák, B.

AU - Dózsa, A.

AU - Kovács, J.

AU - Szabó, R.

AU - Hambleton, K. M.

AU - Kinemuchi, K.

AU - Kolbas, V.

AU - Kurtz, D. W.

AU - Maloney, F.

AU - Prša, A.

AU - Southworth, J.

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AU - Bíró, I. B.

AU - Jankovics, I.

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AB - KIC 8560861 (HD 183648) is a marginally eccentric (e = 0.05) eclipsing binary with an orbital period of Porb = 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 M1 = 1.93 ± 0.12 M⊙, R1 = 3.30 ± 0.07 R⊙, Teff1 = 7650 ± 100K for the primary, and M2 = 1.06 ± 0.08 M⊙, R2 = 1.11 ± 0.03 R⊙, Teff2 = 6450 ± 100K 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 Pobs apse = 10 400 ± 3 000y, which is ten times faster than what is theoretically expected. These findings might indicate the presence of a distant, unseen companion.

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KW - Stars: fundamental parameters

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KW - Stars: oscillations

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