Issue |
A&A
Volume 423, Number 3, September I 2004
|
|
---|---|---|
Page(s) | 777 - 786 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361:20035913 | |
Published online | 12 August 2004 |
Cu and Zn in the early Galaxy
1
Instituto de Astrofísica de Canarias, c/ Vía Láctea, s/n, 38205 La Laguna, Tenerife, Spain e-mail: [gbihain;gil;rrl]@ll.iac.es
2
Consejo Superior de Investigaciones Científicas, Spain
3
Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy e-mail: [molaro;bonifacio]@ts.astro.it
Received:
19
December
2003
Accepted:
27
April
2004
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 3273.95 Å and
3302.58 Å
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 lesser extent the higher [Zn/Fe] ratios at low metallicities, indicating possibly missing yields.
Key words: stars: Population II / stars: abundances / Galaxy: evolution
© ESO, 2004
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