GD 1212 showed the largest recorded outburst in a DAV white dwarf, attributed to parametric instability, with refined 17-hour rotation from mode splittings and a failed outburst event.
A detection threshold in the amplitude spectra calculated from Kepler data obtained during K2 mission
2 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We present our analysis of simulated data in order to derive a detection threshold which can be used in the pre-whitening process of amplitude spectra. In case of ground-based data of pulsating stars, this threshold is conventionally taken to be four times the mean noise level in an amplitude spectrum. This threshold is questionable when space-based data are analyzed. Our effort is aimed at revising this threshold in the case of continuous 90-day Kepler K2 phase observations. Our result clearly shows that a 95% confidence level, common for ground observations, can be reached at 5.4 times the mean noise level and is coverage dependent. In addition, this threshold varies between 4.8 and 5.7, if the number of cadences is changed. This conclusion should secure further pre-whitening and helps to avoid over-interpretation of spectra of pulsating stars observed with the Kepler spacecraft during K2 phase. We compare our results with the standard approach widely used in the literature.
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astro-ph.SR 2years
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IZ Tel and UW Vir are oEA binaries with δ Sct primaries showing mass transfer, derived masses of 1.48/0.33 and 2.39/0.67 solar masses, and multi-frequency pulsations including combination modes.
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Mode Instability and a Massive, Isolated Outburst in the Pulsating White Dwarf GD 1212
GD 1212 showed the largest recorded outburst in a DAV white dwarf, attributed to parametric instability, with refined 17-hour rotation from mode splittings and a failed outburst event.
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IZ Tel and UW Vir: Southern oscillating eclipsing Algol systems with active mass transfer
IZ Tel and UW Vir are oEA binaries with δ Sct primaries showing mass transfer, derived masses of 1.48/0.33 and 2.39/0.67 solar masses, and multi-frequency pulsations including combination modes.