Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..591z&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
A quantitative understanding of evolution of nuclei heavier than iron in the Galaxy has so far been a challenging problem. Only recently have the observational data grown in number and precision to allow a direct comparison with theoretical predictions. In order to reconstruct the evolutionary history of neutron-capture elements in the Galaxy one must disentangle the s- and r-process contributions of all their isotopes and follow their abundances as a function of Galactic age. A new series of abundance analysis of lead star's candidates is presented here which started with spectroscopy of lead-rich star HD196944 ([Fe/H] = -2.45; [hs/ls] = +0.8). High-resolution CCD spectra in a large spectral region from 3500 to 10000 A have been used to determine detailed abundance pattern for a large number of species. The results are compared with available spectroscopic observations of stars at different metallicities in both the Galactic halo and the disc and calculations of neutron-capture nucleosynthesis.
Musaev Faig
Spelmanis Raivis
Zacs Laimons
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