The Unique Properties of omega Centauri Seen Through Stroemgren Eyes

Details The Unique Properties of omega Centauri Seen Through Stroemgren Eyes The Unique Properties of omega Centauri Seen Through Stroemgren Eyes

1999-10-20

arxiv.org/abs/astro-ph/9910370v1

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures, in Proceedings of the 35th Liege International Astrophysics Colloquium: "The Galactic Halo: from Globular

Scientific paper

A revised metallicity calibration of the Stroemgren (b-y),m_1 diagram, based on a sample of globular cluster and field red giant stars, is presented. This new calibration has been used to determine Stroemgren metallicities ([Fe/H]_phot) for more than 1400 red giants in omega Centauri. Most of the stars belong to a metal poor ([Fe/H]_phot = -1.7 dex), old population. A second more metal rich ([Fe/H]_phot = -0.9 dex) population is found to be about 3 Gyr younger and more centrally concentrated than the old one. The CN-rich stars do not seem to follow the radial distribution of the metal rich population.

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