You searched for: “asteroseismology
asteroseismology
1. Measuring starquakes.
2. The study of the interior of stars by means of oscillations on their surfaces.

The oscillations studied by asterioseismologists are driven by thermal energy converted into kinetic energy of pulsation. This process is similar to what goes on with any heat engine, in which heat is absorbed in the high temperature phase of oscillation and emitted when the temperature is low.

The star on which this technique has been applied most effectively is the Sun, where the technique is known as helioseismology.

The stars that asteroseismologists study are constantly vibrating, sending compression waves richocheting through their interiors to the surface, where they manifest as changes in the stars’ brightness.

—"Asteroseismology, an intriguing new field", Omni, magazine;
February, 1994; page 22.