Using Cepheids to determine the galactic abundance gradient II. Towards the galactic center

Details Using Cepheids to determine the galactic abundance gradient II. Towards the galactic center Using Cepheids to determine the galactic abundance gradient II. Towards the galactic center

2001-12-21

arxiv.org/abs/astro-ph/0112513v1

Astronomy and Astrophysics

Astrophysics

8 pages, 6 postscript figures, LaTeX, uses Astronomy and Astrophysics macro aa.cls, graphicx package, to be published in Astro

Scientific paper

10.1051/0004-6361:20020016

Based on spectra obtained at the Anglo-Australian Observatory, we present a discussion of the metallicity of the galactic disc derived using Cepheids at galactocentric distances 4-6 kpc. Our new results together with previous gradient determination (Paper I) show that the overall abundance distribution within the galactocentric distances 4-11 kpc cannot by represented by a single gradient value. The distribution is more likely bimodal: it is flatter in the solar neighbourhood with a small gradient, and steepens towards the galactic center. The steepening begins at a distance of about 6.6 kpc.

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