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As 98% of all stars evolve into white dwarf starsm their study tell us about the evolution of the majority of stars. White dwarf stars show luminosity variations when their temperature reach instabilitity strips caused by high surface opacity. These variations are due to global pulsations that can be used to study the internal structure and evolution of the stars. Their observations can be used as laboratories to test physical theories at high density and temperature.
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S. O. Kepler (2004) studied this question.
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