Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-16
Astrophys.J.646:L119-L122,2006
Astronomy and Astrophysics
Astrophysics
ApJL accepted
Scientific paper
10.1086/506933
We report the abundance analysis of one red giant branch star in the metal-poor outer halo globular cluster NGC 5694. We obtain [Fe/H] = -1.93, based on the ionized lines, and our metallicity measurement is in good agreement with previous estimates. We find that [Ca+Ti/2Fe] and [Cu/Fe] of NGC 5694 are about 0.3 -- 0.4 dex lower than other globular clusters with similar metallicities, but similar to some LMC clusters and stars in some dwarf spheroidal galaxies. Differences persist, however, in the abundances of neutron capture elements. The unique chemical abundance pattern and the large Galactocentric distance (30 kpc) and radial velocity (-138.6 +/- 1.0 km/sec) indicate that NGC 5694 had an extragalactic origin.
Carney Bruce W.
Lee Jae-Woo
Lopez-Morales Mercedes
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