Abundances of neutron capture elements in Population II stars. (original) (raw)

ADS

;

• Sneden, Christopher ;
• Pilachowski, Catherine A. ;
• Cowan, John J.

Abstract

The authors have presented new heavy-element abundance results for 20 very metal poor stars. It has been demonstrated that the very heavy element abundances correlate only loosely with the Fe abundances: star-to-star scatter exists in excess of observational error, and signals the incomplete mixing of nucleosynthesis products in the galactic halo. Also it has been shown that a distinct r-process pattern is characteristic of the very heavy element abundance patterns. Finally, the onset of large amounts of galactic s-processing at a metallicity of ≈-2 has been identified and has led to the suggestion that the time scale of the buildup of Galactic metallicities to this value was ≡107yr.

Publication:

The Astrophysical Journal

Pub Date:

1988

DOI:

10.1086/166191

Bibcode:

1988ApJ...327..298G

Keywords:

• Abundance;
• Metallicity;
• Stellar Composition;
• Stellar Physics;
• Stellar Spectra;
• Absorption Cross Sections;
• Forbidden Transitions;
• Neutron Cross Sections;
• Stellar Atmospheres;
• Astrophysics;
• Galactic Halo:Chemical Evolution;
• Nucleosynthesis:Population II Stars;
• Population II Stars:Element Abundances;
• Population II Stars:Nucleosynthesis