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Fig. 2

image

Internal chemical profiles of He and H and the Ledoux term B (upper panel) and the propagation diagram – the run of the logarithm of the squared critical frequencies () – (lower panel), in terms of the outer mass fraction coordinate, corresponding to the pre-WD template model of M = 0.1612 M and Teff ~ 7400 K marked in Fig. 1. In the lower panel, small “+”symbols (in blue) correspond to the spatial location of the nodes of the radial eigenfunction of dipole ( = 1) g, p and gp mixed modes. The (squared) frequency interval corresponding to gp mixed modes is enclosed with two dotted horizontal lines. Nodes corresponding to unstable modes (from the k = 2g mixed mode to the k = 27 pure g mode) are emphasized with “×” symbols (in magenta) connected with thin lines.

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