期刊
ASTRONOMY & ASTROPHYSICS
卷 384, 期 1, 页码 140-144出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:20020016
关键词
stars : abundances; stars : Cepheids; Galaxy : abundances; Galaxy : evolution
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 of 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 be 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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