Tags: Star.
Type II Cepheids are variable stars which pulsate with periods typically between 1 and 50 days. Like all Cepheid variables Type IIs exhibit a relationship between the star’s luminosity and pulsation period Type II Cepheids are population II stars and are thus old typically metal-poor and low mass objects.Historically Type II Cepheids were called W Virginis variables but are now divided into three subclasses based on the length of their period.