Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21932307c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #323.07
Other
Scientific paper
We present chemical abundances and ages of stellar populations in M31, the nearest massive spiral galaxy. We have measured detailed chemical abundances for over 20 elements in a sample of 30 M31 globular clusters using high resolution spectra of their integrated light. The GCs are dispersed throughout the inner and outer halo, with galactocentric radii between 2.5 kpc and 117 kpc. We find a range of [Fe/H] within 20 kpc of the center of M31, and a constant [Fe/H] -1.6 for the outer halo GCs. We also derive cluster ages using Fe lines and present the first accurate age-metallicity relationship for the M31 GC system, with the result that the more metal-rich clusters in the sample are also the youngest. We find consistently high α-element abundances for a large range in [Fe/H] of -2.2 to -0.26. This implies that these M31 GCs formed in an environment with a high star formation rate, perhaps higher and more sustained than the early star formation rate of the Milky Way. We also measure the first abundances of 8 heavy neutron-capture elements, which are the first abundances of their kind in old stellar populations found more than 150 kpc from the Milky Way. These results provide the most comprehensive abundance history ever obtained for any other massive galaxy besides the Milky Way.
Bernstein Rebecca A.
Colucci Janet E.
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