期刊
ASTRONOMY & ASTROPHYSICS
卷 423, 期 3, 页码 777-786出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20035913
关键词
stars : Population II; stars : abundances; Galaxy : evolution
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 Cu I 3273.95 Angstrom and Zn I 3302.58 Angstrom 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.
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