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Title:
The [Zn/Fe] - [Fe/H] trend for disk and halo stars
Authors:
Chen, Y. Q.; Nissen, P. E.; Zhao, G.
Affiliation:
AA(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, PR China ), AB(Institute of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark ), AC(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, PR China )
Publication:
Astronomy and Astrophysics, v.425, p.697-705 (2004) (A&A Homepage)
Publication Date:
10/2004
Origin:
A&A
Astronomy Keywords:
stars: abundances, stars: atmospheres, Galaxy: evolution, Galaxy: solar neighbourhood, galaxies: high-redshift
DOI:
10.1051/0004-6361:20047191
Bibliographic Code:
2004A&A...425..697C

Abstract

Zn abundances, derived from a model atmosphere analysis of the λ6362.35 Å Zn I line, are presented for 44 thin disk, 10 thick disk and 8 halo dwarf stars in the metallicity range -1.0 < [Fe/H] < +0.2. It is found that [Zn/Fe] in thin disk stars shows a slight increasing trend with decreasing metallicity reaching a value [Zn/Fe] ≃ +0.1 at [Fe/H] = -0.6. The thick disk stars in the metallicity range -0.9 < [Fe/H] < -0.6 have an average [Zn/Fe] ≃ +0.15 dex, whereas five alpha-poor and Ni-poor halo stars in the same metallicity range have [Zn/Fe] ≃ 0.0 dex. These results indicate that Zn is not an exact tracer of Fe as often assumed in abundance studies of damped Lyman-alpha systems (DLAs). A better understanding of the nucleosynthesis of Zn is needed in order to obtain more detailed information on the past history of star formation in DLAs from e.g. the observed sulphur/zinc ratio.

Based on observations collected at the National Astronomical Observatories, Xinglong, China and the European Southern Observatory, La Silla, Chile (ESO No. 67.D-0106).

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