Cu and Zn in the early Galaxy

Details Cu and Zn in the early Galaxy Cu and Zn in the early Galaxy

2004-05-04

arxiv.org/abs/astro-ph/0405050v1

Astron.Astrophys. 423 (2004) 777-786

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, to appear in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20035913

We present Cu and Zn abundances for 38 FGK stars, mostly dwarfs, spanning a metallicity range between solar and [Fe/H] =-3. The abundances were obtained using Kurucz's local thermal equilibrium (LTE) model atmospheres and the near-UV lines of CuI 3273.95 A and ZnI 3302.58 A observed at high spectral resolution. The trend of [Cu/Fe] versus [Fe/H] is almost solar for [Fe/H] > -1 and then decreases to a plateau <[Cu/Fe]> =-0.98 at [Fe/H] <-2.5, whereas the [Zn/Fe] trend is essentially solar for [Fe/H] >-2 and then slightly increases at lower metallicities to an average value of <[Zn/Fe]> =+ 0.18. We compare our results with previous work on these elements, and briefly discuss them in terms of nucleosynthesis processes. Predictions of halo chemical evolution fairly reproduce the trends, especially the [Cu/Fe] plateau at very low metallicities, but to a lower extent the greater [Zn/Fe] ratios at low metallicities, indicating eventually missing yields.

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