Combining WASP and Kepler data: the case of the $\delta$ Sct star KIC 7106205

Abstract

Ground-based photometric observations from WASP have been calibrated, scaled and combined with Kepler observations of the $\delta$ Sct star KIC 7106205, allowing us to extend the time base of the study of the unexplained amplitude and frequency variation of a single pressure mode at $\nu =13.3942$ d${}^{-1}$ by 2 yr. Analysis of the combined data sets, spanning 6 yr, show that the amplitude modulation in KIC 7106205 has a much larger range than a previous study of the Kepler data alone indicated. The single pressure mode decreased from $11.70\pm 0.05$ mmag in 2007, to $5.87\pm 0.03$ mmag in 2009, and to $0.58\pm 0.06$ mmag in 2013. Observations of the decrease in mode amplitude have now been extended back 2 yr before the launch of Kepler. With observations over a longer time span, we have been able to further investigate the decrease in mode amplitude in KIC 7106205 to address the question of mode amplitude stability in $\delta$ Sct stars. This study highlights the usefulness of the WASP data set for extending studies of some Kepler variable stars.

Accepted for publication in MNRAS

References in corpus (3)

• Pulsational Frequency and Amplitude Modulation in the $\delta$\,Sct star KIC\,7106205
• KIC 7582608: A new Kepler roAp star with frequency variability
• Multimode Resonant Coupling in Pulsating Stars

Cited by in corpus (4)

• The first view of $\delta$ Scuti and $\gamma$ Doradus stars with the TESS mission
• Highlights of Discoveries for $\delta$ Scuti Variable Stars From the Kepler Era
• KIC5950759: a high-amplitude $\delta$ Sct star with amplitude and frequency modulation near the terminal age main sequence
• Discovery and Characterization of Three New High-amplitude delta Scuti Stars from TESS Observations