On the Abundance of Potassium in Metal-Poor Stars

Details On the Abundance of Potassium in Metal-Poor Stars On the Abundance of Potassium in Metal-Poor Stars

2001-10-08

arxiv.org/abs/astro-ph/0110165v2

Astronomy and Astrophysics

Astrophysics

16 pages (including 2 tables and 4 figures), to appear in PASJ, Vol.54, No.2 (using the style file pasj00.cls)

Scientific paper

Based on extensive statistical-equilibrium calculations, we performed a non-LTE analysis of the K {\sc i} 7699 equivalent-width data of metal-deficient stars for the purpose of clarifying the behavior of the photospheric potassium abundance in disk/halo stars. While the resulting non-LTE abundance corrections turned out to be considerably large, amounting to 0.2--0.7 dex, their effect on the [K/Fe] vs. [Fe/H] relation is not very important, since these corrections do not show any significant metallicity dependence. Hence, we again confirmed the results of previous LTE studies, that [K/Fe] shows a gradual systematic increase toward a lowered metallicity up to [K/Fe] $\sim$ 0.3--0.5 at [Fe/H] $\sim$ -1 to -2, such as in the case of $\alpha$ elements.

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