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Amplitude variability in γ Dor and δ Sct stars observed by the Kepler spacecraft

Published online by Cambridge University Press:  27 October 2016

Joyce A. Guzik ,
Katie Kosak ,
Paul A. Bradley  and
Jason Jackiewicz
Joyce A. Guzik
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM USA 87545 email: [email protected]
Katie Kosak
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM USA 87545 email: [email protected] Florida Institute of Technology, Melbourne, FL USA 32901
Paul A. Bradley
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM USA 87545 email: [email protected]
Jason Jackiewicz
Affiliation:
New Mexico State University, Las Cruces, NM USA 88003
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Abstract

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The NASA Kepler spacecraft data revealed a large number of multimode nonradially pulsating γ Dor and δ Sct variable star candidates. The Kepler high precision long time-series photometry makes it possible to study amplitude variations of the frequencies. We summarize recent literature on amplitude and frequency variations in pulsating variables. We are searching for amplitude variability in several dozen faint γ Doradus or δ Scuti variable-star candidates observed as part of the Kepler Guest Observer program. We apply several methods, including a Matlab-script wavelet analysis developed by J. Jackiewicz, and the wavelet technique of the VSTAR software (http://www.aavso.org/vstar-overview). Here we show results for two stars, KIC 2167444 and KIC 2301163. We discuss the magnitude and timescale of the amplitude variations, and the presence or absence of correlations between amplitude variations for different frequencies of a given star. Amplitude variations may be detectable using Kepler data even for stars with Kepler magnitude > 14 with low-amplitude frequencies (~100 ppm) using only one or a few quarters of long-cadence data. We discuss proposed causes of amplitude spectrum variability that will require further investigation.

Keywords

stars: δ Sctstars: γ Dorstellar pulsationsKepler spacecraft
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 560 - 566
Copyright
Copyright © International Astronomical Union 2016 

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