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| 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. |
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