Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-19
Astrophys.J.640:956-965,2006
Astronomy and Astrophysics
Astrophysics
ApJ, in press. (26 pages, 3 figures)
Scientific paper
10.1086/500289
We present the observed pulsation spectra of all known non-interacting ZZ Ceti stars (hydrogen atmosphere white dwarf variables; DAVs) and examine changes in their pulsation properties across the instability strip. We confirm the well established trend of increasing pulsation period with decreasing effective temperature across the ZZ Ceti instability strip. We do not find a dramatic order of magnitude increase in the number of observed independent modes in ZZ Ceti stars, traversing from the hot to the cool edge of the instability strip; we find that the cool DAVs have one more mode on average compared to the hot DAVs. We confirm the initial increase in pulsation amplitude at the blue edge, and find strong evidence of a decline in amplitude prior to the red edge. We present the first observational evidence that ZZ Ceti stars lose pulsation energy just before pulsations shut down at the empirical red edge of the instability strip.
Clemens James Christopher
Kepler S. O.
Montgomery Michael H.
Mukadam Anjum Shagufta
Winget Don E.
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