Generally speaking, they are Population I yellow giant stars, as the Population II stars following into this category are often classified as W Virginis, because of their lower mass and metallicity.
Generally speaking, they are Population I yellow giant stars, as the Population II stars following into this category are often classified as W Virginis, because of their lower mass and metallicity. Edwin Hubble first discovered some in the Andromeda Galaxy,* proving it was extragalactic and the Hubble Space Telescope has discovered some in the Virgo Cluster, establishing its distance as approximately 20 Mpc. FTP, what are these stars often used as a standard in establishing the distance of globular clusters and galaxies?
Generally speaking, they are Population I yellow giant stars, as the Population II stars following into this category are often classified as W Virginis, because of their lower mass and metallicity.
Cepheid Variable