SIMBAD references

2004ApJ...617.1091S - Astrophys. J., 617, 1091-1114 (2004/December-3)

The rise of the s-process in the Galaxy.

SIMMERER J., SNEDEN C., COWAN J.J., COLLIER J., WOOLF V.M. and LAWLER J.E.

Abstract (from CDS):

From newly obtained high-resolution, high signal-to-noise ratio spectra the abundances of the elements La and Eu have been determined over the stellar metallicity range -3<[Fe/H]<+0.3 in 159 giant and dwarf stars. Lanthanum is predominantly made by the s-process in the solar system, while Eu owes most of its solar system abundance to the r-process. The changing ratio of these elements in stars over a wide metallicity range traces the changing contributions of these two processes to the Galactic abundance mix. Large s-process abundances can be the result of mass transfer from very evolved stars, so to identify these cases we also report carbon abundances in our metal-poor stars.
Result. indicate that the s-process may be active as early as [Fe/H]=-2.6, although we also find that some stars as metal-rich as [Fe/H]=-1 show no strong indication of s-process enrichment. There is a significant spread in the level of s-process enrichment even at solar metallicity.

Abstract Copyright:

Journal keyword(s): Galaxy: Disk - Galaxy: Evolution - Galaxy: Halo - Stars: Abundances - Stars: Kinematics - Stars: Population II

VizieR on-line data: <Available at CDS (J/ApJ/617/1091): table3.dat table4.dat>

Simbad objects: 167

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2019.07.17-15:32:58

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