Chemical evolution of the galaxy - A comparison of the abundances of light metals in disk and halo dwarfs

Details Chemical evolution of the galaxy - A comparison of the abundances of light metals in disk and halo dwarfs Chemical evolution of the galaxy - A comparison of the abundances of light metals in disk and halo dwarfs

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160..264f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 2, May 1986, p. 264-276.

Astronomy and Astrophysics

Astrophysics

100

Abundance, Chemical Evolution, Dwarf Galaxies, Galactic Evolution, Metallicity, Stellar Composition, Astronomical Spectroscopy, Data Reduction, Disk Galaxies, Light Elements, Nuclear Fusion, Tables (Data)

Scientific paper

High resolution and high signal-to-noise spectra of 36 field dwarf stars have been obtained in the red and used to calculate Na, Al, Mg, and Si abundances relative to iron, with Fe/H abundance ratios varying between -2.60 and +0.30. The results indicate that the relative abundances of light metals such as Mg and Si in halo stars are independent of Fe/H ratios, and that the relative abundances of the Al/Mg and Na/Mg ratios are probably also constant, demonstrating that the odd-even effect is enhanced in the halo. The relative abundances of metals is found to change progressively form halo-type ratios to disk ratios in the dwarfs of the disk. Interpretations of the observed phenomena include the light element abundances being produced in constant ratios in the halo, for example, by a unique type of supernova; and the disk abundances being a mixing of halo and disk abundances leading asymptotically to solar ratios.

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