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We present the results of the asteroseismic analysis of thehydrogen-deficient white dwarf PG 0112+104 from the $Kepler$-2 field. Ourseismic procedure using the forward method based on physically sound, staticmodels, includes the new core parameterization leading us to reproduce theperiods of this star near the precision of the observations. This new fitoutperforms current state-of-the-art standards by order of magnitudes. Weprecisely establish the internal structure and unravel the inner C/Ostratification of its core. This opens up interesting perspectives on betterconstraining key processes in stellar physics such as nuclear burning,convection, and mixing, that shape this stratification over time.

Asteroseismic cartography of hydrogen-deficient white dwarfs