Absolute ages of globular clusters and the age of the universe

@article{Chaboyer1995AbsoluteAO,
  title={Absolute ages of globular clusters and the age of the universe},
  author={Brian Chaboyer},
  journal={The Astrophysical Journal},
  year={1995},
  volume={444}
}
  • B. Chaboyer
  • Published 6 December 1994
  • Physics
  • The Astrophysical Journal
The main sequence turnoff luminosity is the best stellar `clock' which can be used to determine the absolute ages of globular clusters. This is due to the fact that it is generally assumed that the luminosity and lifetimes of main sequence globular cluster stars are independent of the properties of stellar convection and atmospheres, two areas of stellar evolution which are poorly understood. Several possible sources of error in this stellar clock are discussed, and isochrones are constructed… 

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References

SHOWING 1-10 OF 18 REFERENCES
Observational Tests of Cosmological Inflation
I. Inflation Theory.- Fundamental Arguments for Inflation.- Predictions of Inflation.- Classicality of Density Perturbations in the Early Universe.- The Influence of Non-Linear Density Fluctuations
Observational Tests of Cosmological InflationDordrecht: Kluwer)
  • Observational Tests of Cosmological InflationDordrecht: Kluwer)
  • 1991
Inside the Stars, IAU Col
  • Inside the Stars, IAU Col
  • 1993
ApJS
  • ApJS
  • 1992
ApJS
  • ApJS
  • 1991
Stellar Atmospheres: Beyond Classical ModelsDordrecht: Kluwer)
  • Stellar Atmospheres: Beyond Classical ModelsDordrecht: Kluwer)
  • 1991
Astrophysical ages and dating methods
Cosmic Abundances of Matter
  • Cosmic Abundances of Matter
  • 1989
Neutrino Astrophysics (Cambridge
  • 1989
...
1
2
...