Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324l..67m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. L67-L70.
Astronomy and Astrophysics
Astrophysics
17
Chemical Evolution, Dwarf Stars, Galactic Evolution, Neodymium, Nuclear Reactions, Thorium, G Stars, Interstellar Matter, Solar System, Star Formation
Scientific paper
The importance of Galactic chemical evolution and the different nucleosynthetic origins for thorium and neodymium with regard to the recent observations of neighboring spectral lines from these elements in G dwarf 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 are emphasized. 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 best upper limit of T(0) about 18 Gyr to the age of the Galaxy is derived, although simpler schematic models for the evolution of the Th/Nd ratio can give upper limits ranging from 9 to 20 Gyr.
Mathews Grant J.
Schramm David N.
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