The Peculiar Chemical Inventory of NGC 2419 -- An Extreme Outer Halo
  "Globular Cluster"
  NGC 2419 is a massive outer halo Galactic globular cluster whose stars have
previously been shown to have somewhat peculiar abundance patterns. We have
observed seven luminous giants that are members of NGC 2419 with Keck/HIRES at
reasonable SNR. One of these giants is very peculiar, with an extremely low
[Mg/Fe] and high [K/Fe] but normal abundances of most other elements. The
abundance pattern does not match the nucleosynthetic yields of any supernova
model. The other six stars show abundance ratios typical of inner halo Galactic
globular clusters, represented here by a sample of giants in the nearby
globular cluster M30. Although our measurements show that NGC 2419 is unusual
in some respects, its bulk properties do not provide compelling evidence for a
difference between inner and outer halo globular clusters.
