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.

arXiv commentAccepted for publication in MNRAS

References in corpus (13)

• The WASP Project and the SuperWASP Cameras
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• Correcting systematic effects in a large set of photometric lightcurves
• Kepler Asteroseismology Program: Introduction and First Results
• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• The Kepler characterization of the variability among A- and F-type stars. I. General overview
• High frequency A-type pulsators discovered using SuperWASP
• On the incidence of eclipsing Am binary systems in the SuperWASP survey
• Evidence of resonant mode coupling and the relationship between low and high frequencies in a rapidly rotating A star
• 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 (10)

• Amplitude modulation in $\delta$ Sct stars: statistics from an ensemble study of Kepler targets
• Characterising the observational properties of δ Sct stars in the era of space photometry from the Kepler mission
• The first view of $\delta$ Scuti and $\gamma$ Doradus stars with the TESS mission
• On the photometric detection of Internal Gravity Waves in upper main-sequence stars I. Methodology and application to CoRoT targets
• K2 space photometry reveals rotational modulation and stellar pulsations in chemically peculiar A and B stars
• 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
• Suppressed phase variations in a high amplitude rapidly oscillating Ap star pulsating in a distorted quadrupole mode
• HD 41641: A classical $\delta$ Sct-type pulsator with chemical signatures of an Ap star
• Discovery and Characterization of Three New High-amplitude delta Scuti Stars from TESS Observations