Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21534005c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #340.05; Bulletin of the American Astronomical Society, Vol. 42, p.445
Other
Scientific paper
We present the first detailed chemical abundances of extragalactic globular clusters in the Local Group using a new method for analyzing high-resolution (λΔλ 25,000) integrated light spectra. Here we present new detailed abundances for 20 α, Fe-peak, and neutron capture elements obtained from individual spectral lines for clusters in M31, the dwarf irregular NGC 6822, and the LMC. Our new analysis method (derived from standard RGB star analysis methods and as accurate) also provides age constraints for unresolved clusters. As we demonstrate on LMC clusters, our analysis methods let us measure accurate abudances and ages for clusters of all ages. The high S/N, high resolution spectra needed for detailed abundance analysis can be obtained for unresolved clusters in galaxies within 4 Mpc with current telescopes. Application of this new method to large samples of globular clusters in a range in environments and of a variety of ages will help to constrain the star formation histories of galaxies of different masses, as well as put constraints on merger history and hierarchical buildup of massive galaxies. As globular clusters form during major episodes of star formation, they are important tracers of the assembly history of galaxies, especially at distances where detailed spectroscopic studies of individual stars are not possible. The detailed abundances presented here for globular clusters in M31 are the first such measurements for old stars in a large galaxy other than the Milky Way.
Bernstein Rebecca A.
Cameron S.
Cohen Judith Gamora
Colucci Janet E.
McWilliam Andrew
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