Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13r.589s&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Stellar Abundances
Scientific paper
We present the abundance analysis of the star CS29497-030 which displays a low metallicity ([Fe/H]=-2.8) and a large enhancement of the neutron capture elements. The Pb overabundance with respect to iron ([Pb/Fe]=3.5) is the highest to-date among the s-process enhanced very metal poor stars. The abundance analysis provides also a large overabundance of carbon ([C/Fe]=+2.38) nitrogen ([N/Fe]=+1.88) and oxygen ([O/Fe]=+1.67). These abundances result from the analysis of high resolution and high S/N spectra obtained using the UVES spectrograph on the 8.2m VLT-Kueyen telescope in the course of the Large Programme 165.N-0276 P.I. R. Cayrel. The origin of neutron capture elements at low metallicity has for twenty years been thought to be from the r-process only. The occurence of several stars of very low metallicity which exhibit a large overabundance of s-process elements and lead overabundance with respect to the heavy neutron capture elements(e.g Ba La Ce Nd) seems to point unmistakably to an s-process origin. This suggests that the s-process was operating at early times in the Galaxy at least locally.
Andersen Jeppe J.
Barbuy Batriz
Beers Timothy C.
Bonifacio Piercarlo
Cayrel Roger
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