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Kepler eclipsing binaries with δ Scuti components and tidally induced heartbeat stars

Published online by Cambridge University Press:  27 October 2016

Zhao Guo ,
Douglas R. Gies  and
Rachel A. Matson
Zhao Guo
Affiliation:
Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P. O. Box 5060, Atlanta, GA 30302-5060, USA email: [email protected], [email protected], [email protected]
Douglas R. Gies
Affiliation:
Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P. O. Box 5060, Atlanta, GA 30302-5060, USA email: [email protected], [email protected], [email protected]
Rachel A. Matson
Affiliation:
Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P. O. Box 5060, Atlanta, GA 30302-5060, USA email: [email protected], [email protected], [email protected]
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Abstract

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δ Scuti stars are generally fast rotators and their pulsations are not in the asymptotic regime, so the interpretation of their pulsation spectra is a very difficult task. Binary stars, especially eclipsing systems, offer us the opportunity to constrain the space of fundamental stellar parameters. Firstly, we show the results of KIC9851944 and KIC4851217 as two case studies. We found the signature of the large frequency separation in the pulsational spectrum of both stars. The observed mean stellar density and the large frequency separation obey the linear relation in the log-log space as found by Suarez et al. (2014) and García Hernández et al. (2015). Second, we apply the simple ‘one-layer model’ of Moreno & Koenigsberger (1999) to the prototype heartbeat star KOI-54. The model naturally reproduces the tidally induced high frequency oscillations and their frequencies are very close to the observed frequency at 90 and 91 times the orbital frequency.

Keywords

(Stars:) binaries: eclipsingStars: oscillationsTechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 648 - 652
Copyright
Copyright © International Astronomical Union 2016 

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