A stellar oscillation is a normal mode of a star or stellar model. Pressure, buoyancy, rotation, self-gravity, or an imposed gravitational potential supplies its restoring force.
An incompressible stellar surface mode has vanishing Lagrangian volume perturbation. In a harmonic fixed potential, a displacement generated by a solid spherical harmonic has a frequency fixed by its angular degree.
Periodic tidal forcing excites a stellar normal mode with response proportional to in an undamped linear model. Dissipation regularizes the divergence and introduces a phase shift near resonance.
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