Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..800p&link_type=abstract
Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 800-808.
Astronomy and Astrophysics
Astrophysics
43
Abundance, Dwarf Stars, Nuclear Fusion, Stellar Models, Stellar Spectra, Atmospheric Models, Heavy Elements, Metals, Nuclear Explosions, Spectral Line Width, Stellar Atmospheres, Stellar Evolution, Stellar Temperature
Scientific paper
Accurate relative abundances of elements in very metal-poor stars are derived from new high-resolution spectra. Abundance data for A not higher than 62 clash with the dilution hypothesis and supermassive object (SMO) hypothesis, but are in accord with the explosive nucleosynthesis predictions. The neutron excess for the stars studied is estimated from abundances of (odd-Z) V and Mn. Helium burning is assigned to the stage immediately preceding the explosion, rather than hydrostatic carbon burning. Constant explosive nucleosynthesis throughout the history of the local Galaxy is inferred from even-Z data. The s-process elements Ba and Y become increasingly overdeficient as the Fe/H ratio declines. The data impose crucial constraints on explosive nucleosynthesis in early stages of the Galaxy's chemical evolution, and shed light on s-process ageing.
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