Nickel overabundances in extremely metal-deficient red giants

Details Nickel overabundances in extremely metal-deficient red giants Nickel overabundances in extremely metal-deficient red giants

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271l..75l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. L75-L78.

Astronomy and Astrophysics

Astrophysics

47

Metallicity, Nuclear Fusion, Red Giant Stars, Stellar Spectra, Supernovae, Abundance, Iron, Nickel, Stellar Atmospheres, Thermodynamic Equilibrium

Scientific paper

Local thermodynamic equilibrium model-atmosphere abundance analyses of 37 metal-poor (the Fe/H abundance ratio being between -3.0 and -6.0) field red-giant stars are carried out on the basis of high-dispersion echelle spectrograms. Nickel has been found to be overabundant in all stars with an abundance ratio less than -1.8; for the most metal-deficient star in the sample, the Ni/Fe abundance ratio is equal to +0.8. The elements in extreme Population II stars were probably synthesized in very massive Type II supernovae. Therefore, the results imply that such supernovae eject material with a much higher Ni/Fe ratio than do the less massive and more typical supernovae that made the elements in the solar system and young stars.

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