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We present the second results of an ensemble and systematic survey ofoscillation mode variability in compact pulsators observed with the original{\sl Kepler} mission. Two types of flux calibrations, raw and corrected,collected on two hot B subdwarf stars, KIC\,2438324 and KIC\,11179657, arethoroughly examined with the goal to evaluate the difference of patterns whenoscillation modes modulate in amplitude (AM) and frequency (FM). We concentrateon AMs and FMs occurring in seven multiplet components in each star asrepresentative frequencies. The analysis shows that FM measurements areindependent of the flux calibration we choose. However, if flux contaminationby nearby stars is large, AMs may be significantly different between raw andcorrected flux. In addition, AMs suffer, to some extent, from systematicmodulation pattern which is most likely induced by instrumental effects {and}differs from one star to another. Our results indicate that stars with nocontamination are better candidates to quantitatively compare modulationpatterns with theory and should be given a higher priority for such studies,since light contamination will destroy real amplitude modulation patterns.

astrophysical journal/the astrophysical journal

Oscillation mode variability in evolved compact pulsators from Kepler  photometry. II. Comparison of modulationpatterns between raw and corrected  flux