to the Galactic Center, globular clusters, and galaxies. Examples Type II Cepheids are not as well known as their type I counterparts, with only a couple of naked eye examples. In this list, the period quoted for RV Tauri variables is the interval between successive deep minima, hence twice the comparable period for the other sub-types. References External links OGLE Atlas of Variable Star Light Curves - Type II Cepheids Type II Cepheid Astrometry Standard candles Population II stars