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Paper: Asteroseismic Results for GD 154
Volume: 334, 14th European Workshop on White Dwarfs
Page: 577
Authors: Hurkal, D.O.; Handler, G.; Steininger, B.A.; Reed, M.D.
Abstract: GD 154 is one of the coolest and longest-period pulsating DA white dwarf stars. Thus, we may use its pulsations to understand its interior structure and the red edge of the ZZ Ceti Instability Strip. We have acquired new time-resolved photometry of this star, showing that its pulsational frequencies and amplitudes have changed compared to earlier investigations, including a Whole Earth Telescope campaign. We believe that different radial overtones are now excited and we discuss the asteroseismic implications of our findings.
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