Editing Variable star (section)

=====Classical Cepheid variables=====
{{Main|Classical Cepheid variable}}

Classical Cepheids (or Delta Cephei variables) are population I (young, massive, and luminous) yellow supergiants which undergo pulsations with very regular periods on the order of days to months. On September 10, 1784, [[Edward Pigott]] detected the variability of [[Eta Aquilae]], the first known representative of the class of Cepheid variables. However, the namesake for classical Cepheids is the star [[Delta Cephei]], discovered to be variable by [[John Goodricke]] a few months later.