In the 1930s astronomer Arthur Stanley Eddington showed that the mathematical equations that describe the interior of a star may lead to instabilities that cause a star to pulsate.

• 天文学家爱丁顿在1930年代发现这类变星并解释变光原因：他表示，描述星球内部的数学方程式也会导致星球因不稳定产生脉动。