The Re-187 - Os-187 chronology and chemical evolution of the Galaxy

Details The Re-187 - Os-187 chronology and chemical evolution of the Galaxy The Re-187 - Os-187 chronology and chemical evolution of the Galaxy

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117...65y&link_type=abstract

Astronomy and Astrophysics, vol. 117, no. 1, Jan. 1983, p. 65-82. Research supported by the Deutsche Forschungsgemeinschaft and

Astronomy and Astrophysics

Astrophysics

67

Astronomical Models, Chemical Evolution, Cosmology, Milky Way Galaxy, Radioactive Age Determination, Evolution (Development), Neutron Cross Sections, Nuclides, Osmium Isotopes, Rhenium Isotopes

Scientific paper

The paper considers the utility of the Re-187 - Os-187 pair of nuclides as a chronometer with which to study the chemical evolution of the Galaxy, in addition to its present interest in studies of solar system material. A simple one-zone model for the chemical evolution of the Galaxy in the solar neighborhood is formulated and compared with observations to derive a range for the age of the Galaxy. A model of the evolution of astrated Re-187 and Os-187 is then developed with particular emphasis on the stellar enhancement of beta-transmutation and Os-187 electron capture rates. Results indicate that the Re-187 - Os-187 pair allows for an age of the Galaxy on the order of 11-15 billion years, consistent with the chemical evolution model. It is noted, however, that Re-187 - Os-187 cannot yet be regarded as a truly reliable chronometer due to uncertainties in the present solar-system Os/Re ratio and the Os-187 s-process yield.

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