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Paper: Photometric Variability and Spectroscopic Characterisation of White Dwarfs in Kepler 2 Fields
Volume: 509, 20th European Workshop on White Dwarfs (EuroWD16)
Page: 329
Authors: Braker, I. P.; Burleigh, M. R.; Goad, M. R.; Casewell, S. L.; Buckley, D.; Holberg, J. B.; Lawrie, K. A.; Barstow, M. A.
Abstract: It had long been thought that the majority of white dwarfs (WDs) are photometrically stable at the level of a least a few mmags with the exception of those WDs in the instability strip and some magnetic WDs. However long term (≈ tens of days), high photometric precision, observations of such stars had not previously been undertaken. The Kepler and Kepler 2 (K2) missions have provided an opportunity to photometrically monitor a large sample (≈10001500) of WDs. Our analysis of isolated WDs in campaigns 1 to 7 shows that up to ≈25% of the sample is photometrically variable, with some WDs with peak to peak amplitudes of >5%. Many of these targets had only been previously classified photometrically. Our spectroscopic follow up indicates that up to 20% may not be bona fide WDs.
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