No Heavy Element Dispersion in the Globular Cluster M92

Details No Heavy Element Dispersion in the Globular Cluster M92 No Heavy Element Dispersion in the Globular Cluster M92

2011-09-13

arxiv.org/abs/1109.2876v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in ApJ Letters

Scientific paper

Although there have been recent claims that there is a large dispersion in the abundances of the heavy neutron capture elements in the old Galactic globular cluster M92, we show that the measured dispersion for the absolute abundances of four of the rare earth elements within a sample of 12 luminous red giants in M92 (less than or equal to 0.07 dex) does not exceed the relevant sources of uncertainty. As expected from previous studies, the heavy elements show the signature of the r-process. Their abundance ratios are essentially identical to those of M30, another nearby globular cluster of similar metallicity.

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