Heavy elements abundances in metal-poor stars
Abstract
A sample of 21 metal-poor stars have been analysed on the basis of high resolution and high signal-to-noise spectra. Correlations between relative abundances of 16 elements have been studied, with a special emphasis on the neutron-capture ones. This analysis reveals the existence of two sub-populations of field halo stars, namely Pop IIa and Pop IIb. They differ by the behaviour of the s-process elements versus the α and r-process elements. We suggest a scenario of formation of these stars, which closely relates the field halo stars to the evolution of globular clusters. The two sub-populations would have evaporated the clusters during two different stages of their chemical evolution.
- Publication:
-
Tours Symposium on Nuclear Physics III
- Pub Date:
- February 1998
- DOI:
- 10.1063/1.55192
- Bibcode:
- 1998AIPC..425..592M
- Keywords:
-
- 26.45.+h;
- 97.10.Cv;
- 97.10.Bt;
- Stellar structure interiors evolution nucleosynthesis ages;
- Star formation