The long-lived radioisotopes as monitors of stellar, galactic, and cosmological phenomena

Details The long-lived radioisotopes as monitors of stellar, galactic, and cosmological phenomena The long-lived radioisotopes as monitors of stellar, galactic, and cosmological phenomena

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..958r&link_type=abstract

Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 958-962.

Astronomy and Astrophysics

Astrophysics

16

Abundance, Nuclear Fusion, Radioactive Isotopes, Stellar Evolution, Cosmology, Deuterium, Galactic Evolution, Hydrogen, Metals

Scientific paper

The formalism of Searle (1973) and Pagel and Patchett (1975) for the study of the chemical evolution of galaxies is outlined, and a lifetime against star formations is derived for the interstellar gas. The depletion of deuterium by astration is analyzed along with nucleosynthesis of metals in the Galaxy. The formalism is then applied to analyze observational data on the solar-system abundances of the following long-lived r-process radioisotopes: I-129, Pu-244, U-235, U-238, and Th-232. It is concluded that (1) the data are consistent with a constant initial mass function and a constant rate of star formation throughout the lifetime of the Galaxy, (2) a large but brief increase in the yield rates of r-process elements at an early stage in the Galaxy's existence cannot be precluded, (3) galactic rotation may have affected the yield rate of nucleosynthesis, (4) the fraction of unastrated gas in the Galaxy consistent with the present analysis is about 50 per cent, and (5) the primordial galactic D/H ratio is of the order of 0.00003 if the infall of extragalactic matter is neglected.

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