The Luminosity function and stellar evolution

@article{Salpeter1955TheLF,
  title={The Luminosity function and stellar evolution},
  author={E. Salpeter},
  journal={The Astrophysical Journal},
  year={1955},
  volume={121},
  pages={161-167}
}
  • 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).