Mathematics – Logic
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...258..421v&link_type=abstract
Science (ISSN 0036-8075), vol. 258, no. 5081, p. 421-424.
Mathematics
Logic
11
Cosmology, Galactic Evolution, Milky Way Galaxy, Stellar Evolution, Universe, Abundance, Color-Magnitude Diagram, Distance, Galactic Clusters, Globular Clusters, Hubble Constant, Radioactive Isotopes
Scientific paper
Distance determinations of galaxies are reviewed and placed on a uniform, self-consistent scale. It is shown that abundance ratios of radioactive elements may be used to determine the age of the Milky Way Galaxy which probably lies in the range of 10 x 10 exp 9 to 20 x 10 exp 9 years. Galactic ages in the range of 12 x 10 exp 9 to 17 x 10 exp 9 years are obtained by fitting stellar evolutionary tracks to the color-magnitude diagrams of stars in the oldest globular clusters. An age of the universe in the range of 13 x 10 exp 9 to 18 x 10 exp 9 years is obtained allowing about 1 x 10 exp 9 years for the proto-Galaxy to accumulate and for globular clusters to form. Using standard cosmological models with a density parameter equal to 1 and a cosmological constant equal to 0, the corresponding values of the Hubble parameter are found to be greater than or equal to 36 but less than or equal to 50 km/s/Mpc.
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