Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314..182p&link_type=abstract
Astronomy and Astrophysics, v.314, p.182-190
Astronomy and Astrophysics
Astrophysics
34
White Dwarfs, Stars: Oscillations, Stars: Interiors, Stars: Individual: Gd 154
Scientific paper
This paper presents the results of high speed photometric observations of the cool variable DA white dwarf (DAV) GD 154 obtained with the Whole Earth Telescope. GD 154 is one of the coolest pulsating DA white dwarfs and its study is important for understanding the red edge of the ZZ Ceti instability strip. Its power spectrum is dominated by three independent modes (P_1_=1186.5s, P_2_=1088.6s and P_3_=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 observed 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 (2.3days) and of the mass of the outer hydrogen layer (2x10^-10^M*).
Barstow Martin
Belmonte Juan Antonio
Bergeron Pierre
Bradley Paul Andrew
Chevreton M.
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