Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS - V. Discovery of two new DBV pulsators, WDJ152738.4−450207.4 and WD 1708−871, and asteroseismology of the already known DBV stars PG 1351+489, EC 20058−5234, and EC 04207−4748

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Fig. 14.

Chemical profiles (upper panel) and the squared Brunt-Väïsälä and Lamb frequencies for ℓ = 1 and ℓ = 2 (lower panel) corresponding to our asteroseismological DB WD model of PG 1351 with a stellar mass M_⋆ = 0.664 M_⊙ and an effective temperature T_eff = 25 775 K.

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