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Table 1

Perturbed surface functions (as defined by Eq. (30)) for the various kinds of perturbations considered in this work.

Perturbation Eigenfrequency σ Surface function

Radial mode
Vertical mode
X mode
Plus mode σ +
Breathing mode σ br

Notes. Here λ is a small parameter scaling the perturbation strength. The eigenfrequencies σ+ and σbr, as well as the prefactors ωij, have complicated expressions, functions of and , that can be found in Straub & Šrámková (2009). The normalization parameters ai are of the order of unity.

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