RR Lyrae
Unlike Cepheids, RR Lyraes are old, low mass, metal-poor "Population II" stars.  They are much more common than Cepheids, but also much less luminous. The average absolute magnitude of an RR Lyrae is about 0.75, only 40 or 50 times brighter than our Sun. Their period is shorter, typically less than one day, sometimes ranging down to seven hours.