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| Paper: |
Updates on the Asteroseismological Study of the ZZ Ceti Star R548: Determination of the Bulk Core Composition |
| Volume: |
481, 6th Meeting on Hot Subdwarf Stars and Related Objects |
| Page: |
187 |
| Authors: |
Giammichele, N.; Fontaine, G.; Brassard, P. |
| Abstract: |
We present a progress report on the detailed asteroseismological analysis of the pulsating white dwarf R548 with the use of the forward method. ZZ Ceti variables are nonradially g-mode pulsating white dwarfs with a hydrogen-dominated atmosphere. The low-amplitude and "simple" pulsator R548 is an ideal candidate for carrying on a complete asteroseismological analysis as five independent frequencies are unequivocally singled out. Using the successful double-optimization technique that has been applied and refined on pulsating hot B subdwarfs for more than a decade, we are capable of unraveling global structural parameters. Taking advantage of independent measurements of spectroscopic temperature and surface gravity, we investigate the constraints on the envelope layering and the bulk composition of the core of R548. |
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