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- W1559888924 abstract "This paper presents the results of high speed photo metric observations of the cool variable DA white dwarf (DAV) GD 154 obtained with the Whole Earth Telescope. GD 154 is one of the c;oolest pulsating DA white dwarfs and its study is important for understanding the red edge of the ZZ Ceti insta bility strip. Its power spectrum is dominated by three indepen dent modes (P 1 = 1186.5s, Pz = 1088.6s and P3 = 402.6s), and their harmonics and linear combinations. None of the half-integer harmonics reported in previous observations were present during the WET campaign. We propose that the ob served modes are trapped in the thin outer hydrogen layers. From the resulting identification of the pulsation modes, one derives an estimate of the rotation period (2.3 days) and of the mass ofthe outer hydrogen layer (2 X w-IO M *)." @default.
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- W1559888924 date "1995-01-01" @default.
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- W1559888924 title "Whole Earth Telescope observations and seismological analysis of the cool TIL Ceti star GD 154" @default.
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- W1559888924 doi "https://doi.org/10.1515/astro-1995-0216" @default.
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