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Whole Earth Telescope observations of the hot helium atmosphere pulsating white dwarf EC 20058-5234
WET Collaboration, D. J. Sullivan, T. S. Metcalfe +22
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 observ…
Strong limits on the DFSZ axion mass with G117-B15A
A. Bischoff-Kim, M. H. Montgomery, D. E. Winget
We compute rates of period change (Pdots) for the 215s mode in G117-B15A and the 213s mode in R548, first for models without axions, and then for models with axions of increasing m…
Fine Grid Asteroseismology of R548 and G117-B15A
A. Bischoff-Kim, M. H. Montgomery, D. E. Winget
We now have a good measurement of the cooling rate of G117-B15A. In the near future, we will have equally well determined cooling rates for other pulsating white dwarfs, including…