Galactic chemical evolution of primary elements in the solar neighbourhood - II. Elements affected by the s-process

Details Galactic chemical evolution of primary elements in the solar neighbourhood - II. Elements affected by the s-process Galactic chemical evolution of primary elements in the solar neighbourhood - II. Elements affected by the s-process

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.288..108p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 288, Issue 1, pp. 108-116.

Astronomy and Astrophysics

Astronomy

44

Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Population Ii, Solar Neighbourhood

Scientific paper

We apply the analytical model developed previously to the Galactic chemical evolution of elements that in the Solar system come primarily from the s-process, but at low metallicities are believed to come primarily from the r- process. We find that a `primary' production model is indicated for the s-process, but with two separate time delays that are treated in the `delayed production' approximation and turn out to be of the order of 37 Myr and 2.7 Gyr, corresponding to progenitor masses of about 8 and 1.5 Msolar respectively. While the latter component fits in well with current models of s-process synthesis of material in the Solar system, the early component raises some difficulties because asymptotic giant branch (AGB) stars of high mass and low metallicity are observed to generate a high ratio of heavy to light s-process elements, whereas the field stars presumed to represent the effects of Galactic chemical evolution still have Solar system-like heavy to light ratios.

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