ASPCS
 
Back to Volume
Paper: Quantitative Asteroseismology: Determination of the Core Composition and Layering of the ZZ Ceti Star R 548. Part II
Volume: 469, 18th European White Dwarf Workshop (EUROWD12)
Page: 49
Authors: Giammichele, N.; Fontaine, G.; Brassard, P.
Abstract: We present a preview of a detailed asteroseismological study of the pulsating white dwarf R548 based on fits to newly detected periods and the use of the forward method. We first exploited a very high S/N photometric data set gathered with the CFHT/LAPOUNE combination, and isolated five secure independent periods for seismic modeling with spherical models. The details of this frequency extraction analysis having been summarized elsewhere, we now turn to a brief description of the seismic analysis per se. Using a method that has been developed and refined over more than a decade for applications to pulsating hot subdwarf stars mostly, we computed several million models during the course of an automatic and objective search in parameter space for the optimal model. Combining our results with independent spectroscopic constraints, we find that the global structural parameters of R548 can be well determined, including the envelope layering and the bulk composition of the core.
Back to Volume