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Searching for pulsations in Kepler eclipsing binary stars

Published online by Cambridge University Press:  18 February 2014

Patrick Gaulme
Affiliation:
Dept. of Astronomy, New Mexico State University P.O. Box 30001, MSC 4500, Las Cruces, NM 88003USA email: [email protected]
Joyce A. Guzik
Affiliation:
Los Alamos National Laboratory, XTD-NTA, MS T086, Los Alamos, NM 87545USA email: [email protected]
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Abstract

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Eclipsing binaries can in principle provide additional constraints to facilitate asteroseismology of one or more pulsating components. We have identified 94 possible eclipsing binary systems in a sample of over 1800 stars observed in long cadence as part of the Kepler Guest Observer Program to search for γ Doradus and δ Scuti star candidates. We show the results of a procedure to fold the light curve to identify the potential binary period, subtract a fit to the binary light curve, and perform a Fourier analysis on the residuals to search for pulsation frequencies that may arise in one or both of the stellar components. From this sample, we have found a large variety of light curve types; about a dozen stars show frequencies consistent with δ Sct or γ Dor pulsations, or light curve features possibly produced by stellar activity (rotating spots). For several stars, the folded candidate ‘binary’ light curve resembles more closely that of an RR Lyr, Cepheid, or high-amplitude δ Sct star. We show highlights of our results and discuss the potential for asteroseismology of the most interesting objects.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

References

Gaulme, P., McKeever, J., Rawls, M. L., Jackiewicz, J., Mosser, B., & Guzik, J. A. 2013, ApJ, 767, 82Google Scholar