Mathematics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ode..symp.....m&link_type=abstract
Presented at the Symposium on the Origin and Distribution of Elements, New Orleans, La., 31 Aug. 1987
Mathematics
Abundance, Chemical Evolution, Chronology, Galactic Evolution, Neodymium, Thorium, Cosmology, Mathematical Models, Stellar Evolution
Scientific paper
The importance of galactic chemical evolution and the different nucleosynthetic origins for thorium and neodymium are emphasized with regard to the recent observations of neighboring spectral lines from these elements in G-Dwarfs stars and the use of the correlation of the spectral line ratio with stellar age to derive an upper limit to the age of the galaxy. When effects of galactic chemical evolution and nucleosynthetic origin are included the systematic trend in the data toward constant or even increasing Th/Nd ratio with stellar age can be easily understood. A model dependent (3sigma) best upper limit of T0 approx. = 18 Gyr to the age of the galaxy is derived, although simpler schematic models for the evolution of the Th/Nd ratio can give (3sigma) upper limits ranging from 9 to 20 Gyr.
Mathews Grant J.
Schramm David N.
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