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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