Whole Earth Telescope Observations and Seismological Analysis of the Cool ZZ Ceti Star GD 154
Fast photometric observations of a cool DAV star, GD 154, obtained with the Whole Earth Telescope are presented. GD 154 is one of the coolest pulsating DA white dwarfs and its study is relevant for understanding of the red edge of the ZZ Ceti instability strip. Its power spectrum is dominated by three independent modes (P_1=1186.5 s, P_2=1088.6 s
Pfeiffer, B. et al.
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1995