SIMBAD references

1995BaltA...4..245P - Baltic Astronomy, 4, 245-260 (1995/October-0)

Whole Earth Telescope observations and seismological analysis of the cool ZZ Ceti star GD 154.

PFEIFFER B., VAUCLAIR G., DOLEZ N., CHEVRETON M., FREMY J.-R., BARSTOW M.A., BELMONTE J.A., KEPLER S.O., KANAAN A., GIOVANNINI O., FONTAINE G., BERGERON P., WESEMAEL F., GRAUER A.D., NATHER R.E., WINGET D.E., PROVENCAL J., CLEMENS J.C., BRADLEY P., DIXSON J.S., KLEINMAN S.J., WATSON T.K., CLAVER C.F., MAZEH T., LEIBOWITZ E.M. and MOSKALIK P.

Abstract (from CDS):

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 (P1=1186.5 s, P2=1088.6 s and P3=402.6 s). It also exhibits harmonics and linear combinations of these three modes. However, none of the half-integer harmonics, reported in previous observations, were present during the WET campaign. Assuming that the observed modes are trapped in the thin outer hydrogen layer, an identification of the pulsation modes is proposed. The rotation period (2.3 days) and the mass of the outer hydrogen layer (2x10–10 M* ) are derived.

Abstract Copyright: ∼

Journal keyword(s): stars: interiors - stars: oscillations - stars: pulsations - stars: structure - stars: individual: GD 154

Simbad objects: 5

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