Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..753t&link_type=abstract
Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 753-757.
Astronomy and Astrophysics
Astrophysics
5
Abundance, Astronomical Models, Barium, Chemical Evolution, Nuclear Fusion, Stellar Evolution, Halos, Iron, Stellar Mass
Scientific paper
The production of Ba in a disk is discussed with regard to the apparent constancy of the production rate of Ba relative to Fe over the lifetime of the disk. An infall model of the chemical evolution of Ba/Fe within the disk is constructed, which satisfies present observational constraints and produces a Ba/H-Fe/H relation which is consistent with available observational data. It is shown that the constancy of the Ba/Fe ratio is an artifact of an inadequate and insufficiently accurate data sample, and is a secondary product of Ba, which is 20 to 80 times less efficient than the production ratio for the halo. It is also predicted that stars formed during the transition period between halo and disk should show a Ba/Fe excess relative to the sun of about a factor of 2, and it is concluded that the possible sources of the Ba/Fe overproduction are incompatible with present theoretical limits on the mass ranges for iron and barium production by stars.
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