Left panel: unstable ℓ = 1 mode periods (Π) in terms of the effective temperature, corresponding to the ELM WD model sequence with M⋆ = 0.1762 M⊙. Color coding indicates the value of the logarithm of the e-folding time (τe) of each unstable mode (right scale). The vertical line indicates the effective temperature of the template model analyzed in Fig. 3. Right panel: same as left panel, but for the case in which the action of the ε mechanism is neglected in the stability computations.
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