Physics – Nuclear Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987japa....8..103l&link_type=abstract
(IAU, Meeting on Nucleosynthesis in the Galaxy from the Study of Low-mass Stars, New Delhi, India, Nov. 27, 1985) Journal of Ast
Physics
Nuclear Physics
35
Abundance, Chemical Evolution, Galactic Evolution, Light Elements, Milky Way Galaxy, Hydrogen, Iron, Nuclei (Nuclear Physics), Sodium
Scientific paper
The abundances of the light (Na to Ca) elements in disk and halo stars are reviewed. New analyses are emphasized. Elements considered are the alpha nuclei (Mg, Si, and Ca), and the odd-even nuclei (Na and Al, also Mg-25 and Mg-26). The alpha nuclei are overabundant (relative to Fe) in the old disk and halo stars. Halo stars have alpha/Fe = about 0.3 with extreme halo stars showing possibly higher overabundances. The scatter in alpha/Fe at a given Fe/H is small. To within the observational errors, the abundance patterns for Mg, Si, and Ca are identical. For disk stars, the Na and Al abundances relative to Mg are almost independent of Fe/H. Halo stars show Na/Mg less than 0 and Al/Mg less than 0, but the form of the mean relation and the scatter about the relation between odd-even/Mg and Fe/H remains uncertain.
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