edu.ucar.opensky::articles:10837 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T13:35:09.794677 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7t1547m Asteroseismic constraints on diffusion in white dwarf envelopes 2011-06-01T00:00:00Z publication https://n2t.org/ark:/85065/d7t1547m https://doi.org/10.1111/j.1365-2966.2011.18396.x Bischoff-Kim, A. author Metcalfe, Travis author UCAR/NCAR - Library publisher The asteroseismic analysis of white dwarfs allows us to peer below their photospheres and determine their internal structure. At similar to 28 000K EC20058-5234 is the hottest known pulsating helium atmosphere white dwarf. As such, it constitutes an important link in the evolution of white dwarfs down the cooling track. It is also astrophysically interesting because it is at a temperature where white dwarfs are expected to cool mainly through the emission of plasmon neutrinos. In the present work, we perform an asteroseismic analysis of EC20058-5234 and place the results in the context of stellar evolution and time-dependent diffusion calculations. We use a parallel genetic algorithm complemented with targeted grid searches to find the models that fit the observed periods best. Comparing our results with similar modelling of EC20058-5234's cooler cousin CBS114, we find a helium envelope thickness consistent with time-dependent diffusion calculations and obtain a precise mode identification for EC20058-5234. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2011 Authors. Published under license by John Wiley & Sons for the Royal Meteorological Society. The definitive version is available at http://onlinelibrary.wiley.com. None eng geoscientificInformation