Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........22s&link_type=abstract
PhD Dissertation, Chicago Univ. Chicago, IL United States
Physics
1
Globular Clusters, Chronology, Helium, Abundance, Stellar Mass Accretion, Cosmology, Stellar Physics, Hubble Constant, Baryons, Universe, Mass Distribution, Mass Flow Rate
Scientific paper
The age of globular clusters inferred from observations depends on sensitive assumptions such as the initial helium abundance and the mass loss rate. A high helium abundance (e.g., Y equals approximately 0.28) can lower the current age estimate from 14 +/- 1.5 Gyr to about 11 +/- 1 Gyr, significantly relaxing the constraints on the Hubble constant and allowing values as high as 60 km/sec/Mpc for a baryon-only universe. The uncertainties of a high helium abundance and an instability strip induced mass loss near the turn-off in the globular clusters are discussed. Ages lower than 10 Gyr are not possible even with the operation of both of these mechanisms unless the initial helium abundance in the globular clusters is greater than 0.28, which can hardly be accommodated by indirect inferences of the helium abundances in the globular clusters.
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