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

TL;DR

This study combines ground-based WASP data with Kepler observations to extend the analysis of amplitude and frequency variations in a $ ext{delta}$ Sct star over 6 years, revealing larger amplitude modulations than previously known.

Contribution

It demonstrates the effectiveness of integrating WASP and Kepler data to study long-term stellar variability, specifically amplitude changes in a $ ext{delta}$ Sct star.

Findings

Amplitude of the pressure mode decreased significantly over 6 years.

Extended data shows larger amplitude variations than Kepler data alone indicated.

The study confirms the utility of WASP data for long-term stellar variability analysis.

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.