Core velocity dispersions and metallicities of three globular clusters belonging to the Fornax dwarf spheroidal galaxy

Details Core velocity dispersions and metallicities of three globular clusters belonging to the Fornax dwarf spheroidal galaxy Core velocity dispersions and metallicities of three globular clusters belonging to the Fornax dwarf spheroidal galaxy

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..510d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 2, p. 510-515.

Astronomy and Astrophysics

Astronomy

47

Dwarf Galaxies, Globular Clusters, Metallicity, Radial Velocity, Stellar Motions, Velocity Distribution, Abundance, Local Group (Astronomy)

Scientific paper

On the basis of integrated light spectra obtained at the ESO at Lasilla, Chile, of the three brightest globular clusters of the Fornax dwarf spheroidal galaxy, the projected core velocity dispersions are determined for clusters 3, 4, and 5. The corresponding estimates of the mass-to-light ratios are similar to the typical M/LV values obtained for Galactic globular clusters. From the total area of the cross-correlation function of the integrated light spectra, metallicity estimates are derived with an accuracy of 0.15 dex. We obtain values of (Fe/H) equal to -1.93, -1.35, and -1.89 for the Fornax clusters 3, 4, and 5, respectively. These results, in excellent agreement with earlier determinations, confirm the existence of a large metallicity range among the Fornax globular clusters and strengthen the evidence that Fornax has a rather complex history of star and cluster formation, unexpected for such a low-mass galaxy.

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