Whole Earth Telescope observations of the hot helium atmosphere pulsating white dwarf EC 20058-5234
WET Collaboration: D.J. Sullivan, T.S. Metcalfe, D. O'Donoghue, D.E., Winget, D. Kilkenny, F. van Wyk, A. Kanaan, S.O. Kepler, A. Nitta, S.D., Kawaler, M.H. Montgomery, R.E. Nather, M.S. O'Brien, A. Bischoff-Kim, M., Wood, X.J. Jiang, E.M. Leibowitz, P. Ibbetson, S. Zola

TL;DR
This study analyzes extensive photometric data of the pulsating white dwarf EC 20058-5234, identifying 18 pulsation frequencies, modeling stellar parameters, and providing insights into its rotation and position within the instability strip.
Contribution
It significantly expands the known pulsation spectrum of EC 20058-5234 and employs genetic algorithms for asteroseismic modeling to determine stellar parameters.
Findings
Detected 18 pulsation frequencies, doubling previous counts.
Estimated stellar mass around 0.55 solar masses.
Indications of rapid rotation with a 2-hour period.
Abstract
We present the analysis of a total of 177h of high-quality optical time-series photometry of the helium atmosphere pulsating white dwarf (DBV) EC 20058-5234. The bulk of the observations (135h) were obtained during a WET campaign (XCOV15) in July 1997 that featured coordinated observing from 4 southern observatory sites over an 8-day period. The remaining data (42h) were obtained in June 2004 at Mt John Observatory in NZ over a one-week observing period. This work significantly extends the discovery observations of this low-amplitude (few percent) pulsator by increasing the number of detected frequencies from 8 to 18, and employs a simulation procedure to confirm the reality of these frequencies to a high level of significance (1 in 1000). The nature of the observed pulsation spectrum precludes identification of unique pulsation mode properties using any clearly discernable trends.…
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