$\gamma$ Doradus Pulsations in the Eclipsing Binary Star KIC 6048106

Abstract

We present the $Kepler$ photometry of KIC 6048106 exhibiting O'Connell effect and multiperiodic pulsations. Including a starspot on either of the components, light-curve synthesis indicates that this system is a semi-detached Algol with a mass ratio of 0.211, an orbital inclination of 73.9 deg, and a large temperature difference of 2,534 K. To examine in detail both spot variations and pulsations, we separately analyzed the {\it Kepler} time-series data at the interval of an orbital period by an iterative way. The results reveal that the variable asymmetries of the light maxima can be interpreted as the changes of a magnetic cool spot on the secondary component with time. Multiple frequency analyses were performed in the outside-eclipse light residuals after removal of the binarity effects from the observed {\it Kepler} data. We detected 30 frequencies with signal to noise amplitude ratios larger than 4.0, of which six ($f_2$--$f_6$ and $f_{10}$) can be identified as high-order (17 $\le n\le$ 25) low-degree ($\ell$ = 2) gravity-mode pulsations that were stable during the observing run of 200 d. In contrast, the other frequencies may be harmonic and combination terms. For the six frequencies, the pulsation periods and pulsation constants are in the ranges of 0.352$-$0.506 d and 0.232$-$0.333 d, respectively. These values and the position on the HR diagram demonstrate that the primary star is a $\gamma$ Dor variable. The evolutionary status and the pulsation nature of KIC 6048106 are discussed.

20 pages, including 7 figures and 4 tables, accepted for publication in ApJ

References in corpus (21)

• Kepler Eclipsing Binary Stars. I. Catalog and Principal Characterization of 1879 Eclipsing Binaries in the First Data Release
• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• On the use of empirical bolometric corrections for stars
• Kepler Eclipsing Binary Stars. II. 2165 Eclipsing Binaries in the Second Data Release
• Gamma Doradus Stars: Defining a New Class of Pulsating Variables
• KOI-54: The Kepler Discovery of Tidally-Excited Pulsations and Brightenings in a Highly Eccentric Binary
• KIC 4544587: an Eccentric, Short Period Binary System with delta Sct Pulsations and Tidally Excited Modes
• A heuristic derivation of the uncertainty of the frequency determination in time series data
• Super-Nyquist asteroseismology with the Kepler Space Telescope
• An examination of some characteristics of Kepler Short and Long Cadence Data
• Results of a Search for gamma Dor and delta Sct Stars with the Kepler Spacecraft
• KIC 3858884: a hybrid δ Sct pulsator in a highly eccentric eclipsing binary
• Survey for δ Sct components in eclipsing binaries and new correlations between pulsation frequency and fundamental stellar characteristics
• Frequency ratio method for seismic modeling of Gamma Doradus stars
• The Eclipsing System V404 Lyr: Light-Travel Times and Gamma Doradus Pulsations
• Validation of the Frequency Modulation technique applied to the pulsating delta Sct - gamma Dor eclipsing binary star KIC 8569819
• 1SWASP J093010.78+533859.5: A Possible Hierarchical Quintuple System
• The Frequency Ratio Method for the seismic modelling of gamma Doradus stars. II The role of rotation
• KIC 6220497: A New Algol-type Eclipsing Binary with Multiperiodic Pulsations
• KIC 4739791: A New R CMa-type Eclipsing Binary with a Pulsating Component
• V2653 Ophiuchii with a pulsating component and Ppuls-Porb, Ppuls-g correlations for gamma-Dor type pulsators

Cited by in corpus (12)

• The effect of tides on near-core rotation: analysis of 35 Kepler $\gamma$ Doradus stars in eclipsing and spectroscopic binaries
• New pulsating stars detected in EA-type eclipsing binary systems based on TESS data
• Absolute Properties of the Pulsating Post-mass Transfer Eclipsing Binary OO Draconis
• KIC 6206751: the first R CMa-type eclipsing binary with $\gamma$ Doradus pulsations
• Eclipsing Systems with Pulsating Components (Types β Cep, δ Sct, γ Dor or Red Giant) in the Era of High-Accuracy Space Data
• A Mass-accreting Gamma Doradus Pulsator with a Synchronized Core in Kepler Eclipsing Binary KIC 7385478
• KIC 11401845: An Eclipsing Binary with Multiperiodic Pulsations and Light Travel Time
• Absolute Properties of the Eclipsing $\gamma$ Dor Star V404 Lyrae
• The Eclipsing $\delta$ Scuti Star EPIC 245932119
• TESS Photometry of the Eclipsing $\delta$ Scuti Star AI Hydrae
• KIC~8975515: a fast-rotating ($\gamma$ Dor - $\delta$ Sct) hybrid star with Rossby modes and a slower $\delta$ Sct companion in a long-period orbit
• KIC 6951642: confirmed Kepler $\gamma$ Doradus-$\delta$ Scuti star with intermediate to fast rotation in a possible single-lined binary system