2 research outputs found
No Heavy Element Dispersion in the Globular Cluster M92
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.Comment: Accepted for publication in ApJ Letter