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Trends in copper and zinc abundances for disk and halo stars.

C. Sneden, R. Gratton, D. A. Crocker

Open publisher page 22 citations

Abstract

Copper and zinc abundances have been derived for a large sample of field and globular cluster stars which span the (iron-peak) metallicity range −2.9 ≤ [M/H] ≤ −0.1. The Zinc abundances closely track the overall metallicities : [Zn/M] = +0.04 ± 0.02 (σ = 0.09 for a single star) from 40 stars analyzed here, with no discernable change over 3 decades of stellar metallicity. On the other hand, there are copper deficiencies in all metal-poor stars. These deficiencies appear to vary linearly with metallicity : [Cu/M] = 0.38 [M/H] + 0.15 (with σ = 0.15 for the 21 field stars of our sample)

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What this paper is about

Copper and zinc abundances have been derived for a large sample of field and globular cluster stars which span the (iron-peak) metallicity range −2.9 ≤ [M/H] ≤ −0.1. The Zinc abundances closely track the overall metallicities : [Zn/M] = +0.04 ± 0.02 (σ = 0.09 for a single star) from 40 stars analyzed here, with no discernable change over 3 decades of stellar metallicity. On the other hand, there are copper deficiencies in all metal-poor stars. These deficiencies appear to vary linearly with metallicity : [Cu/M] = 0.38 [M/H] + 0.15 (with σ = 0.15 for the 21 field stars of our sample)

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Available abstract

Copper and zinc abundances have been derived for a large sample of field and globular cluster stars which span the (iron-peak) metallicity range −2.9 ≤ [M/H] ≤ −0.1. The Zinc abundances closely track the overall metallicities : [Zn/M] = +0.04 ± 0.02 (σ = 0.09 for a single star) from 40 stars analyzed here, with no discernable change over 3 decades of stellar metallicity. On the other hand, there are copper deficiencies in all metal-poor stars. These deficiencies appear to vary linearly with metallicity : [Cu/M] = 0.38 [M/H] + 0.15 (with σ = 0.15 for the 21 field stars of our sample)

Key concepts: Metallicity, Physics, Astrophysics, Stars, Globular cluster, Zinc, Halo, Galactic halo

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