The [Zn/Fe] -- [Fe/H] trend for disk and halo stars
Abstract
Zn abundances, derived from a model atmosphere analysis of the 6362.35 A ZnI 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.
Cite
@article{arxiv.astro-ph/0406612,
title = {The [Zn/Fe] -- [Fe/H] trend for disk and halo stars},
author = {Y. Q. Chen and P. E. Nissen and G. Zhao},
journal= {arXiv preprint arXiv:astro-ph/0406612},
year = {2009}
}
Comments
10 pages, 9 figures, use aa.cls