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The [Zn/Fe] -- [Fe/H] trend for disk and halo stars | | Y.Q. Chen
; P. E. Nissen
; G. Zhao
; | | Date: |
28 Jun 2004 | | Subject: | astro-ph | | Affiliation: | National Astronomical Observatories, China), P. E. Nissen (Institute of Physics and Astronomy, University of Aarhus, Denmark), G. Zhao (National Astronomical Observatories, China | | 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. | | Source: | arXiv, astro-ph/0406612 | | Services: | Forum | Review | PDF | Favorites | |
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