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Paper: Discovery of Two New Accreting ZZ Ceti Stars
Volume: 372, 15th European Workshop on White Dwarfs
Page: 603
Authors: Mukadam, A.S.; Szkody, P.; Fraser, O.J.; Silvestri, N.M.; Gaensicke, B.T.; Aungwerojwit, A.
Abstract: We report two new accreting ZZ Ceti stars amongst the cataclysmic variables of the Sloan Digital Sky Survey: SDSS J074531.92+453829.5 and SDSS J091945.11+085710.0. We observe high amplitude non-sinusoidal variations of 4.5-7% at a period close to 1230 s in the optical light curves of SDSS J074531.92+453829.5 and a low amplitude variation of 0.7-1% near 260 s in the light curves of SDSS J091945.11+085710.0. We infer that these optical variations are a consequence of non-radial g-mode pulsations in the accreting primary white dwarfs of these cataclysmic variables. This discovery paper brings the total number of known accreting white dwarf pulsators to ten. We determine an orbital period of 86.3 ± 2.0min for SDSS J074531.92+453829.5 and 93.5 ± 8.5min for SDSS J091945.11+085710.0.
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