Variation

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Variation

Steroseismology: (from the colloquium talk by Prof. Jianning Fu on May 31, 2007 at ASIAA)

	Steroseismology of stars can be divided into two classes: P mode and G mode seismology. In P mode, the restoring force of pulsation is dominated by pressure, while in G mode, the restoring force of pulsation is dominated by gravity. The P mode usually happens near the stellar surface, while the G mode usually occurs in the interior of a star. Whether the pulsation of a star is dominated by G mode or P mode depends on the mass (equivalently gravity g) and stellar structure (density, temperature, convection, and so on).
	Observabales such as the pulsation modes, period distribution, strength of different modes, etc. can be used to constrain the mass (or gravity), structure of a star, under the help of stellar pulsation simulation.
	Steroseismology can be well studied for main sequence stars and white dwarfs (WD). According to observations, main sequency stars like our sun are dominated by P mode, while WDs are dominated by G mode.

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