A 30-day Cepheid's average luminosity is about 10,000 times larger than the Sun's typical luminosity.
The Cepheid variable is one of a family of variable stars whose periods—i.e., the length of one cycle of variation—are closely correlated with their luminosities and are thus useful in determining the distances between stars and between galaxies.
Stars that have diverged from the main sequence and into the Cepheid instability strip are known as cepheid stars.
They are perfect stars to serve as primary distance indicating standard candles because they exhibit regular radial pulsation and a clearly defined period-luminosity connection.
Between 1907 and 1921, Leavitt is most recognized for discovering around 2,400 variable stars (when she died).
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