General constraints on the age and chemical evolution of the Galaxy

Details General constraints on the age and chemical evolution of the Galaxy General constraints on the age and chemical evolution of the Galaxy

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..406m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 1, 1986, p. 406-417.

Astronomy and Astrophysics

Astrophysics

40

Chemical Evolution, Cosmochemistry, Galactic Evolution, Milky Way Galaxy, Chronology, Constraints, Nuclear Fusion, Plutonium, Rhenium, Thorium, Uranium

Scientific paper

It is the goal of this paper to develop as model-independent a range for the Galaxy's age as possible that takes all nuclear and meteoric data uncertainties into account. Since the mean age of the elements provides a natural, model-independent lower limit on the Galaxy's age, the major task is to obtain a model-independent upper limit. The authors derive such an upper limit from an expansion of the equation giving the mean age of the elements in moments of the normalized effective nucleosynthesis rate. This limit depends only on tν/T, the ratio of the mean time of formation of the elements to the total duration of nucleosynthesis, and on model-independent data. It is shown that the 232Th/238U, 235U/238U, and 244Pu/238U chronometric pairs can give constraints on the relative rate of nucleosynthesis over the history of the synthesis of the solar system material. It is found that the effective nucleosynthesis rate was relatively constant over most of the duration of nucleosynthesis. As a nearly model-independent range for TGal, the age of the Galaxy, the authors obtain: 8.7 ⪉ TGal ⪉ 28.1 Gyr.

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