KIC 4739791: A New R CMa-type Eclipsing Binary with a Pulsating Component

Abstract

The {\it Kepler} light curve of KIC 4739791 exhibits partial eclipses, inverse O'Connell effect, and multiperiodic pulsations. Including a starspot on either of the binary components, the light-curve synthesis indicates that KIC 4739791 is in detached or semi-detached configurations with both a short orbital period and a low mass ratio. Multiple frequency analyses were performed in the light residuals after subtracting the binarity effects from the original {\it Kepler} data. We detected 14 frequencies: six in the low-frequency region (0.1$-$2.3 d${}^{-1}$) and eight in the high-frequency region (18.2$-$22.0 d${}^{-1}$). Among these, six high frequencies with amplitudes of 0.62$-$1.97 mmag were almost constant over time for 200 d. Their pulsation periods and pulsation constants are in the ranges of 0.048$-$0.054 d and 0.025$-$0.031 d, respectively. In contrast, the other frequencies may arise from the alias effects caused by the orbital frequency or combination frequencies. We propose that KIC 4739791 is a short-period R CMa binary with the lowest mass ratio in the known classical Algols and that its primary component is a $\delta$ Sct pulsating star. Only four R CMa stars have been identified, three of which exhibit $\delta$ Sct-type oscillations. These findings make KIC 4739791 an attractive target for studies of stellar interior structure and evolution.

17 pages, including 6 figures and 2 tables, accepted for publication in AJ

References in corpus (7)

• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• A heuristic derivation of the uncertainty of the frequency determination in time series data
• KIC 3858884: a hybrid δ Sct pulsator in a highly eccentric eclipsing binary
• The Eclipsing System V404 Lyr: Light-Travel Times and Gamma Doradus Pulsations
• The Clusters AgeS Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC-228 in the Globular Cluster 47 Tuc
• Validation of the Frequency Modulation technique applied to the pulsating delta Sct - gamma Dor eclipsing binary star KIC 8569819
• The Kepler Eclipsing System KIC 5621294 and its Substellar Companion

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