The [Zn/Fe] -- [Fe/H] trend for disk and halo stars

Details The [Zn/Fe] -- [Fe/H] trend for disk and halo stars The [Zn/Fe] -- [Fe/H] trend for disk and halo stars

Publishing date

2004-06-28

URL

arxiv.org/abs/astro-ph/0406612v1

Journals

Astron.Astrophys. 425 (2004) 697-705

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info

10 pages, 9 figures, use aa.cls

Type

Scientific paper

Digital Object Identifier

10.1051/0004-6361:20047191

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.

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