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Paper: The White Dwarfs PG1144+005 and G117-B15A
Volume: 292, Interplay of Periodic, Cyclic and Stochastic Variability in Selected Areas of the H-R Diagram
Page: 237
Authors: Steininger, B.; Paparo, M.; Viraaghalmy, G.; Zsuffa, D.; Breger, M.
Abstract: We present the results of four nights CCD photometry of two white dwarfs. PG1144+005 is a spectroscopic PG1159 star, which was previously found to be nonvariable (Grauer et al. 1987). Since its chemical structure suggests variability, additional observations seemed appropriate. The data showed no light variability. G117-B15A is a well observed DAV (ZZ Ceti) star. We observed this star as well in order to assist the derivation of the rate of change of its main pulsation period.
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