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Revised Stroemgren metallicity calibration for red giants
Michael Hilker
A new calibration of the Stroemgren (b-y),m_1 diagram in terms of iron abundance of red giants is presented. This calibration is based on a homogeneous sample of giants in the glob…
The Unique Properties of omega Centauri Seen Through Stroemgren Eyes
M. Hilker, T. Richtler
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…
Stroemgren photometry of globular clusters: M55 & M22
P. Richter, M. Hilker, T. Richtler
We present Stroemgren CCD photometry for the two galactic globular clusters M55 (NGC 6809) and M22 (NGC 6656). We find average Stroemgren metallicities of -1.71 dex for M55 and -1.…
The central region of the Fornax cluster -- III. Dwarf galaxies, globular clusters, and cD halo - are there interrelations?
M. Hilker, L. Infante, T. Richtler
In this paper we briefly review the properties of the dwarf galaxy population at the core of the Fornax cluster, as well as the properties of the extraordinary rich globular cluste…