What are population 1 stars?

Population I stars are relatively young stars that are found primarily in the spiral arms of galaxies, including the Milky Way. They are metal-rich, meaning they contain a higher abundance of elements heavier than hydrogen and helium, which is a result of stellar evolution and supernovae enriching the interstellar medium. These stars typically have a higher temperature and luminosity compared to older stars, and they often include main-sequence stars, giants, and supergiants. Their formation is closely associated with ongoing star formation and the presence of interstellar gas and dust.