Hybrid Pulsations and Tidal Splitting detected in the Kepler Eclipsing and Spotted Binary System KIC 6048106

• Autorzy: Samadi Ghadim A. , Lampens P. , Jassur D. M.

Identyfikatory

DOI

10.32023/0001-5237/68.4.6

• Języki publikacji: EN

Abstrakty

EN

We present a new asteroseismic analysis of KIC 6048106, a Kepler Algol-type eclipsing binary star in a circularized orbit with P_orb=1.559361±0.000036 d. Based on a physical model for the binary and its corresponding set of fundamental parameters (T_eff=7033±187 K, M₁=1.55±0.11 M☉, R₁=1.58±0.12 R☉ and T_eff=4522±103 K, M₂=0.33±0.07 M☉, R₂=1.78±0.16 R☉, respectively for the primary and the secondary component), we obtained the residual light curve after removal of the full binary model, including a 290-d activity cycle for the secondary component. In this work, we used the method of Fourier analysis of the residual light curve in combination with least squares optimization for the frequency analysis. We detected seven dominant, independent gravity (g) modes as well as 34 low-amplitude acoustic (p) modes. The g modes in the range of 1.96–2.85 d^-1 have a mean spacing of ΔΠ_mean=1517.92±131.54 s. Though of much lower amplitude, additional significant frequencies were detected in the intervals 7.49–15.2 d^-1 and 19–22.5 d^-1 (i.e., in the p mode region), with corresponding dominant modes ν_max1=11.745±0.001 d^-1 and ν_max2=20.960±0.002 d^-1 From its position in the HR diagram, we conclude that the primary component is the source of the detected hybrid pulsations. Consequently, the pulsation constants, Q, of the high frequencies cover the range of 0.028–0.064 d. Furthermore, ν₄₃ (19.037±0.002 d^-1) might correspond to the fundamental radial mode (Q=0.033±0.007 d). The other frequencies in the range of 19–22.5 d^-1 could be radial or non-radial overtone modes. Moreover, the low-amplitude p modes show an equidistant splitting by forb, which we interpret as tidal splitting following theoretical predictions.

Słowa kluczowe

EN

techniques: photometric; binaries: eclipsing; stars: fundamental parameters; stars: variables: delta Scuti; stars: oscillations; starspots

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2018
• Tom: Vol. 68, No. 4
• Strony: 425--447
• Opis fizyczny: Bibliogr. 49 poz., rys., tab., wykr.

Twórcy

autor

Samadi Ghadim A.

• Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran

autor

Lampens P.

• Koninklijke Sterrenwacht van België, Ringlaan 3, B-1180 Brussels, Belgium

autor

Jassur D. M.

• Department of Theoretical Physics and Astrophysics, Physics Faculty, University of Tabriz, Tabriz, Iran

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).