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The metallicity gradient of the Galactic bulge *

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References

1995

Year

D. Minniti, Edward W. Olszewski, J. Liebert, Simon D. M. White, John M. Hill, M. J. Irwin
Monthly Notices of the Royal Astronomical Society

Abstract

We determine metallicities for a large number of K giants at 1.5–1.7 kpc from the Galactic Centre, based on medium resolution spectra. We study the bulge metallicity gradient by comparing the present spectroscopic observations with previous metallicity determinations at Baade’s window (BW), at 0.5 kpc from the Galactic Centre. It is confirmed that: (1) there is metallicity gradient within the inner 2 kpc of the Galaxy; (2) at any given distance from the Galactic Centre, there is a large spread in metal abundances.