Chemical evolution of the galaxy: Abundances of the light elements (sodium to calcium) |
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| Authors: | David L Lambert |
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| Institution: | (1) Department of Astronomy, University of Texas, 78712-1083 Austin, Texas, USA |
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| Abstract: | The abundances of the light (Na to Ca) elements in disc and halo stars are reviewed. New analyses are emphasized. Elements
considered are the α-nuclei (Mg, Si, and Ca), and the odd-even nuclei (Na and Al, also25Mg and26Mg).
The α-nuclei are overabundant (relative to Fe) in the old disc and halo stars. Halo stars (Fe/H] < —1.2) have α/Fe] ∼0.3
with extreme halo (Fe/H] ≲ −2.0) stars showing possibly higher overabundances. The scatter in α/Fe] at a given Fe/H] is
small. To within the observational errors, the abundance patterns for Mg, Si, and Ca are identical.
For disc stars, the Na and Al abundances relative to Mg are almost independent of the Fe/H]. Halo stars (Fe/H] < −1) show
Na/Mg] < 0 and AI/Mg] < 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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| Keywords: | Galaxy chemical evolution— abundances light elements |
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