Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..827f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. 827-838.
Astronomy and Astrophysics
Astrophysics
41
Abundance, Binary Stars, Metallicity, Spectral Line Width, Stellar Composition, Supernovae, Cosmochemistry, Line Spectra, Metals, Signal To Noise Ratios, Sun, Tables (Data)
Scientific paper
A differential abundance analysis between the sun and Alpha Cen A has been carried out. Over 500 lines of 26 elements have been measured in very high signal-to-noise ratio spectra of both objects. The result is a linearly averaged metal overabundance in Alpha Cen A of around 0.12 dex, with an error in the mean value for most elements of + or - 0.02 to 0.04 dex. The derived overabundances have been incorporated into the model atmosphere calculations. Light elements up though Zn are distinctly overabundant, whereas heavy elements show solar abundances. A relatively small overabundance of Fe and strong overabundances of the odd-Z elements Na, Al, Mn, and Cu point toward enrichment of the prestellar medium by a Type II supernova. The derived abundances give a consistent age of around 4 billion yr for the A and B components of the Alpha Cen system according to interior model calculations published by Demarque, Guenther, and van Altena (1987).
Furenlid Ingemar
Meylan Tom
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