The Luminosity function and stellar evolution

  title={The Luminosity function and stellar evolution},
  author={E. Salpeter},
  journal={The Astrophysical Journal},
  • E. Salpeter
  • Published 1955
  • Physics
  • The Astrophysical Journal
For studying Population II stars: Particularly, studies of globular clusters H-R diagrams, that suggest that most of the stars in a cluster are formed around the same time. Since for magnitudes brighter than 3.5 there are basically no stars in the H-R diagram, and by estimating the time that it takes for a star (with M" = 3.5 and M = 1.3 M⊙) to burn 12% of its mass from hydrogen to helium, the age of the cluster can be estimated (5 billion years).