Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994cha%26a..18...85z&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 18, Issue 1, p. 85-96.
Astronomy and Astrophysics
Astrophysics
2
Abundances, Heavy Elements, Chemical Evolution Of Galaxy
Scientific paper
In this paper, we determine the abundances of a number of neutron capture elements in metal-poor dwarfs and subgiants. The strontium, yttrium, zirconium, barium, lanthanum, cerium and europium abundances are deduced in a sample of 10 to 20 stars on the basis of high resolution, high signal-to-noise spectra. The main results are: (1) The elements of the first peak, strontium-yttrium-zirconium, show the odd-even effect: strontium and zirconium are less deficient than yttrium in Population II stars. (2) The yttrium abundance is constant ([Y/Fe] = -0.06) for all stars with [Fe/H] > -2.5. (3) The barium overdeficiency increases with decreasing metallicity when [Fe/H] < -1.7. (4) Lanthanum and cerium are overdeficient with respect to iron. (5) Europium is overabundant for -1 > [Fe/H] > -2. (6) There is a real cosmic scatter in [Y/Fe], [Zr/Fe] and [Ba/Fe], of the order of 0.1 dex.
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